maydis, is recognised as a major constraint to global maize production.The disease was first described on maize in the USA in 1924 and now occurs wherever the crop is grown. © Copyright 2020 CAB International. If you would like to, you can learn more about the cookies we use. Before spraying, thesis curvularia leaf spot of maize and its integrated management. The responses of 64 commercial hybrids to grey leaf spot under fungicide treatment were studied over 2 seasons. University of Natal, Pietermaritzburg 3200, South Africa. grey leaf spot disease. Immature GLS lesions can be easily confused with lesions caused by other pathogens; e.g., eyespot (Kabatiella), anthracnose (Colletrichum). Gray leaf spot (GLS), caused by Cercospora zeae-maydis and Cercospora zeina, is one of the most important diseases of maize worldwide.The pathogen has a necrotrophic lifestyle and no major genes are known for GLS. Academia.edu is a platform for academics to share research papers. The lesions expand further and join together to eventually cover the whole leaf, Act when 5-10 spots per leaf are observed or 2-3 leaves are infected per maize plant, Remove infected plants at early symptom stage and destroy by burning, There are currently no registered fungicides in Ethiopia to manage GLS disease. Plant Disease 86:1127-1133 Munkvold, G.P. If not well managed it can Published under a CC-BY-SA 4.0 licence. Find Out More Find more publications in the Diseases of Corn series by visiting the Purdue Extension Education Store It is necessary to determine the distribution and aetiology of the disease across all the maize production agro-ecologies Spores, surviving in the remains of previous crops, are rain-splashed leaf spot on maize. This substance is blown by wind onto the Management Practices to Reduce Gray Leaf Spot of Maize Author: Ward, J. M. J., Laing, M. D., Cairns, A. L. P. Source: Crop science 1997 v.37 no.4 pp. Planting CABI is a registered EU trademark. Maize Grey Leaf Spot (GLS) caused by the pathogen, Cercospora zeae-maydis Tehon and Daniels (1925) ... âManagement strategies for maize grey leaf spot in Kenya and Zimbabweâ (R7566) was to provide effective management of GLS based on sound epidemiological principles (Simons, 2003). Genetic control of resistance to gray leaf spot of maize in tropical germplasm Susceptible hybrids planted in no-till or reduced-till fields are at high risk for gray leaf spot development, but weather is the primary influence on disease develop-ment. are small black spots. Maize Leaf Spot Management masuzi January 21, 2020 Uncategorized 0 Northern corn leaf spot umn extension grey leaf spot of maize pests diseases diffeiating corn leaf diseases northern corn leaf ⦠the epidemiology and management of gray leaf spot are presented. lower leaves of the maize plants and infects them. The trials were evaluated for disease severity and grain yields. buried under soil. ©CAB International. Get PDF (5 MB) Abstract. Development of grey leaf spot (GLS) of maize, caused by Cercospora zeae-maydis, was evaluated in 7 inbreds in 1990 and 19 inbreds in 1991 in field plots with naturally infested maize debris in Virginia, USA. It causes grey rectangular spots that stretch along the ZA 0371) FINAL TECHNICAL REPORT 1 April 2000 â 31 March 2003 Dr Sarah Simons CAB International â Africa Regional Centre 31 March 2003 "This publication is an output from a research project funded by the United Kingdom Department for International ⦠PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST . Ethiopia Share . -products or Tebuconazole-products in a 16 litre sprayer. Share this with Facebook: Twitter: Email: Recognize the problem Grey leaf spot is a fungal disease that affects maize. Julian Ward/KwaZulu-Natal Dept of Agriculture, South Africa. University of Natal, Pietermaritzburg 3200, South Africa. Discovering and utilizing genetic loci for GLS resistance would be useful for breeding new varieties with improved resistance. The objective was to assess the distribution and importance of Grey Leaf Spot. These treatments also suppressed sporulation of P. sorghi on diseased foliage. It causes grey rectangular spots that stretch along the leaf veins on the top surface of the leaf. Gray leaf spot (GLS), caused by Cercospora zeae-maydis and Cercospora zeina, is one of the most important diseases of maize worldwide. Grey leaf spot disease of maize (Cercospora zeaemaydis) has seriously decreased grain yields in the province of KwaZulu-Natal, South Africa, and has spread to infect maize in neighbouring provinces. Grey leaf spot of maize, (Zea maydis L.) (Cercospora zeae-maydis) Tehon and Daniels, is one of the most destructive leaf diseases of maize. Abstract Grey leaf spot disease of maize caused by Cercospora zeae-maydis seriously decreased grain yields in the province of KwaZulu-Natal, South Africa, and spread to maize in neighbouring provinces. cover the whole leaf, causing it to turn brown. Epidemiology and management of grey leaf spot : a new disease of maize in South Africa. Epidemiology and management of gray leaf spot: A new disease of maize in South Africa. Introduction History and distribution of gray leaf spot of maize The first report of gray leaf spot (GLS) of maize, caused by Ce/cospora zeae- Grey leaf spot disease management in maize Cercospora zeae-maydis. leaf spot is a fungal disease that affects maize. Models were developed to assess the risk and predict the severity of gray leaf spot of maize, and to describe relationships between environmental variables and the rate of lesion expansion and sporulation of the causal organism, Cercospora zeae-maydis. the disease is seen on the leaves. Models were developed to assess the risk and predict the severity of gray leaf spot of maize, and to describe relationships between environmental variables and the rate of lesion expansion and sporulation of the causal organism, Cercospora zeae-maydis. All corn hybrids and inbreds are susceptible to Gray Leaf Spot (GLS). Residue Management C. zeae-maydis cannot successfully survive in debris . It is necessary to determine the distribution and aetiology of the disease across all the maize production agro-ecologies Ward JMJ, Hohls T, Laing MD, Rijkenberg FHJ, 1996. Management strategies for maize grey leaf spot (Cercospora zeae-maydis) in Kenya and Zimbabwe DFID No. CREATED/UPDATED: October 2015 PRODUCED BY: Plantwise. Ward JMJ, Hohls T, Laing MD, Rijkenberg FHJ, 1996. ©CAB International. maydis (another different fungus) has been isolated from typical GLS lesions on maize. The United States and South Africa are main areas where research on the disease has been concentrated. The distribution and severity of grey leaf spot has increased over the past 10 to 15 years. with legumes such as beans, cowpeas and groundnuts, or cereals other than maize, You may In time, the leaf spots expand and girdle the leaf, causing it to die back from the tip. treatment on grey leaf spot severity. Authors: Mathews Matimelo, Kanyanta Musonda. Like most websites we use cookies. Grey leaf spot of maize (GLS) Cercospora zeae-maydis. Distribution and Importance of Maize Grey Leaf Spot Cercospora zeaemaydis (Tehon and Daniels) in South and Southwest Ethiopia. Although thought to be one species of fungus, Cercospora zeae-maydis, molecular tests have shown that another fungus, C. zeina, is dominant in eastern USA and southern Africa. European Journal of Plant Pathology, 102(8):765-771; 16 ref. When the leaves are wet or humidity is high, the leaf spots turn gray and fuzzy with profuse spore production. Zambia Share . Grey leaf spot (GLS) is a global maize leaf disease that seriously endangers maize production. Following these five chapters are a summary and general conclusions, and appendix. If not well managed it can cause high losses. season. and produces a powdery substance. after spraying. Quantitative resistance, although poorly understood, is important for GLS management. Farming Systems and Management - ... Gray leaf spot of Maize. also rotate maize with a deep-rooted crop such as sunflower and cotton which will Later, the upper leaves of The recommendations in this factsheet are relevant to: The assessments were done by sampling 81 maize fields in 9 districts from 3 zones during 2017. Continuing to use www.plantwise.org/KnowledgeBank means you agree to our use of cookies. No commercial hybrids, resistant to the disease have so far been identified, and fungicides have been shown to reduce disease severity. Cercospora species causing grey leaf spot at a partic-ular location. Like most websites we use cookies. No commercial hybrids, resistant to the disease have so far been identified. Leaf extracts of Prosophis chilensis and Azadirachta indica were found to be equally effective as P. fluorescens in controlling maize downy mildew, although the extracts were not as effective at inhibiting conidial germination as the pseudomonad or as metalaxyl. Introduction Grey leaf spot (GLS) of maize is caused by the fungus Cercospora zeae-maydis. Grey leaf spot, Cercospora zeae-maydis, has, in a relatively short period, caused significant annual grain yield losses in the maize industry of KwaZulu-Natal, South Africa. Grey leaf spot is a serious yield-reducing disease of maize (Zea mays) in many parts of the world where this crop is cultivated. AUTHOR(S): Teshome Burka (Oromia Agriculture Bureau), Kassahun Sadessa (EIAR), Haile Kassa (Tigray Agricultural Bureau), Regular and elongated brown/gray necrotic lesions parallel to the veins (CIMMYT, www.flickr.com), Lesions expand to cover most of the leaf (CABI), Severe symptoms causing yellowing of maize plants (Gyanu Manandhar), The use of resistant maize varieties such as BH661 or BH543, Crop rotation with non-cereal crops such as leguminous crops (beans, faba bean, chickpea etc. 1B). A field experiment was conducted in Gondar zuria district of western Ethiopia during 2016/17 and 2017/18 cropping season with the aim to evaluate effective maize varieties for the management of maize gray leaf spot disease. These treatments also suppressed sporulation of P. sorghi on diseased foliage. also improve the soil. SUMMARY: Grey leaf spot of maize has emerged as a yield-limiting disease throughout USA and southern Africa in the last 25 years. veins, this is streak virus and not leaf spot fungus. Keywords Cercosporazeae-maydis.Cercospora zeina.Precisionphenotyping.QuantitativePCR.Grey brochures of seed suppliers to know if the variety is resistant or not. Gray leaf spot, a foliar disease of corn (Zeae mays) caused by the fungus Cercospora zeae-maydis, has become of economic importance in many regions of the world over the past 10 years.Gray leaf spot was first described in the U.S.A. in 1925 on corn in Alexander County, IL. The pathogen has a necrotrophic lifestyle and no major genes are known for GLS. Gray leaf spot (GLS) (caused Cercospora zeaeâmaydis Theon & Daniels) is a fungal disease of the maize (Zea mays L.) that can cause significant grain yield reductions. Abstract Grey leaf spot disease of maize caused by Cercospora zeae-maydis seriously decreased grain yields in the province of KwaZulu-Natal, South Africa, and spread to maize in neighbouring provinces. cause high losses. If you would like to, you can learn more about the cookies we use. The spots may join together to The pest management decision guide provides information on how to prevent, monitor and control Cercospora zeae-maydis. Editorial Policies Online Submission Instructions to Authors Policies Publication ethics Reviewers Terms and Conditions. Grey Abstract. Get all of the factsheets and pest management decision guides from this website in an offline format via the Plantwise Factsheets Library app. Gray leaf spot is one of the major constraints of maize production in Ethiopia where warm humid environmental condition is prevailing. Grey leaf spot (GLS) is a fungal disease that can greatly lower maize yields since it reduces the photosynthetic leaf area. Gray leaf spot (GLS) is a common fungal disease in the United States caused by the pathogen Cercospora zeae-maydis in corn. When using a pesticide, always wear protective clothing and follow the instructions on the product label, such as dosage, timing of application, and pre-harvest interval. By Pierce Anderson Paul. We used genetic mapping to refine understanding of the genetic architecture of GLS ⦠You may use Flusilazole/ Carbendazim No commercial hybrids were identified to be resistant to grey leaf spot in the maize hybrid response to grey leaf spot trial. The early GLS lesions are yellow to tan in color and look very similar to those of other diseases, except that they often have a faint watery halo which can be seen when held up to the light (Fig. Grey leaf spot is a serious fungal disease of maize. Individual lesions may be 3 to 4 inches long and 1/16 to 1/8 inch wide, depending on the distance between veins. Gray leaf spot incited by Cercospora zeae maydis, is an important disease of maize (Zea mays L.) world-wide. If you see many yellow thin long streaks along the Grey leaf spot of maize is a serious foliar disease of Zea mays in many countries where it is cultivated, especially in the eastern U.S.A. and Africa (Ward et al. European Journal of Plant Pathology, 102(8):765-771; 16 ref. It causes grey rectangular spots that stretch along the leaf veins on the top surface of the leaf. This article will discuss how to diagnose Gray leaf spot, the disease cycle of the pathogen, impacts of the disease, and management recommendations. The Diagnosis/Identification ), Deep tillage to at least 15 cm three time before planting, After harvest remove infected crop residues and burn before planting to reduce fungi levels in the field, Do not use infected maize stovers (leaves and stems) as mulching material, Synchronise planting time with decreased chance of disease occurrence - if the disease is predicted to occur early then plant late, and plant early if the disease is predicted late in the season, Observe the field weekly after plant emergence for occurrence of symptoms, Early symptoms include pin point sized leaf spots with yellow halos visible on the lower leaves. Read Ward JMJ, 1996. Epidemiology and management of gray leaf spot: A new disease of maize in South Africa. Gray leaf spot initially appears as spots on the leaves that are round or oval, tan in color, and have a dark brown border. © Copyright 2020 CAB International. Fungicide responses of maize hybrids to grey leaf spot. Stalk rot Seed rot ... Maize leaf fleck Maize leaf fleck virus (MLFV) Maize line* Maize line virus (MLV) Maize mosaic (corn leaf stripe, enanismo rayado) Anonymous National Anti-corruption Hotline: 0800 701 701 Drought Intervention Hotline: 0800 000 996 Epidemiology and predictive management of gray leaf spot of maize . disease survives on maize residues left on the soil surface from season to Continuing to use www.plantwise.org/KnowledgeBank means you agree to our use of cookies. Maize Leaf Spot Management masuzi January 21, 2020 Uncategorized 0 Northern corn leaf spot umn extension grey leaf spot of maize pests diseases diffeiating corn leaf diseases northern corn leaf ⦠Of diseases, grey leaf spot is one of the major foliar diseases threatening maize production in Ethiopia. Rotate maize In 1991, 10 ratings over 43 d were made beginning Jul. Ethiopia Share . Fungicide responses of maize hybrids to grey leaf spot. The disease is now recognised as one of the most significant yield-limiting diseases of maize worldwide and certainly in the province of KwaZulu-Natal (see Table 1). 17. Grey leaf spot disease (GLS), Cercospora zeae-maydis, which has previously been attributed to diverse pathogen species in other countries, has become a serious biotic constraint to production of maize (Zea mays L.) in Kenya. Advertising Conferences Contact us. Foreign Title : Makeko dhwanse thegle rog. time, preferably at the onset of rains, because the disease will attack later. Very good tolerance to Grey Leaf Spot; Very good tolerance to NCLS; Excellent tolerance to cob rot; Recommended for region I, II and III of Zambia (all regions). possible. The severity of the disease depends on three factors: the amount of fungus surviving on remains from previous crops, the tolerance/ resistance level of the particular maize variety and, most importantly, weather conditions. Probabilities for profitable fungicide use against gray leaf spot in hybrid maize. Zambia. on time will mean the disease will have little effect on yield. We developed a real-time SYBR® Green PCR assay for quantification of grey leaf spot disease in maize based on the amplification of a frag-ment of a cytochrome P450 reductase (cpr1) gene. maydis Ellis and Everh., occurs on <75% smallholder maize (Zea mays L.) farms in East Africa, and ⦠The spots become long, narrow, rectangular dark brown lesions running parallel with the leaf veins. Gray leaf spot (GLS), caused by the fungus Cercospora zeae-maydis, has been one of the most prevalent foliar fungal diseases of corn in the state of Ohio ever since it was first reported in parts of Pickaway, Ross, Pike and Scioto counties in 1978. Find out about symptoms and management. Journals. At present, gray leaf spot management has three major components: residue management, hybrid tolerance, and . If not well managed it can cause high losses. the plant will also be affected. This is to ensure that we give you the best experience In-season disease manage-ment options, such as fungicides, are also available. You may also consider spraying fungicides when Abstract. Gray leaf spot is one of the major constraints of maize production in Ethiopia where warm humid environmental condition is prevailing. Plant on Use grey Typical grey leaf spots due to the Botryosphaeria festucae [teleomorph] Diplodia ear rot. Quantitative resistance, although poorly understood, is important for GLS management. Fungicides may be needed to prevent significant loss when plants are infected early and environmental conditions favor disease. Gray leaf spot is one of the most common foliar diseases in Delaware corn and can significantly reduce corn yields under favorable conditions. Share this with Facebook: Twitter: Email: Regular and elongated brown/gray necrotic lesions parallel to the veins (CIMMYT, www.flickr.com) Lesions expand to cover most of the leaf (CABI) Severe symptoms causing yellowing of maize plants (Gyanu ⦠When the weather is good, the fungus begins to develop on residues In 1990, 9 ratings over 35 d were made beginning Aug. 9. Management strategies for gray leaf spot include tillage, crop rotation and planting resistant hybrids. This is to ensure that we give you the best experience PhD thesis. Leaf extracts of Prosophis chilensis and Azadirachta indica were found to be equally effective as P. fluorescens in controlling maize downy mildew, although the extracts were not as effective at inhibiting conidial germination as the pseudomonad or as metalaxyl. leaf spot resistant maize varieties available from various seed companies. The disease is spreading to neighbouring provinces and countries. Models were developed to assess the risk and predict the severity of gray leaf spot of maize, and to describe relationships between environmental variables and the rate of lesion expansion and sporulation of the causal organism, Cercospora zeae-maydis. Gray leaf spot (GLS), caused by Cercospora zeae-maydis and Cercospora zeina, is one of the most important diseases of maize worldwide.The pathogen has a necrotrophic lifestyle and no major genes are known for GLS. On the underside of the leaf ⦠The research results have provided valuable and ⦠author(s) vidya palaki fungicide applications. 1A). A-Z Journals Browse By Subject. The responses of 64 commercial hybrids to grey leaf spot under fungicide treatment were studied over 2 seasons. Early symptoms of grey leaf spot losses will be very high. ... Grey leaf spot of maize (GLS) Cercospora zeae-maydis. Published under a CC-BY-SA 4.0 licence. The causal organism associated with the disease is Cercospora zeae-maydis. PDF | On Oct 1, 1999, Julian M. J. The spots may join together to cover the whole leaf, causing it to turn brown. observe the weather to ensure that it will not rain until at least 6 hours It has become well established in the province of KwaZulu-Natal, and is capable of reducing grain yields by 20 to 60%. Loss caused due to grey leaf spot reached 49.5% in Ethiopia. After about two weeks, lesions appear tan to brown in color and rectangular in shape, bordered by the veins of the leaf (Fig. Guidelines & Policies . In Kenya, the disease is caused by C. zeina but there are a few instances in which C. sorghi var. Didymella leaf spot Didymella exitalis: Diplodia ear rot and stalk rot Diplodia frumenti. It first became widespread in the early 1990s. Two potential sibling species have been recognized as Groups I and II. Executive Summary Grey leaf spot (GLS), caused by Cercospora zeae-maydis and, to a lesser extent, Cercospora sorghi var. Gray leaf spot lesions on corn leaves hinder photosynthetic activity, reducing carbohydrates allocated towards grain fill. Grey leaf spot disease (GLS), Cercospora zeae-maydis, which has previously been attributed to diverse pathogen species in other countries, has become a serious biotic constraint to production of maize (Zea mays L.) in Kenya. Not only is it a threat to maize production in the commercial farming sector, it also [â¦] A field experim.. Home. 5 Executive Summary Maize Grey Leaf Spot (GLS) caused by the pathogen, Cercospora zeae-maydis Tehon and Daniels (1925) and to a lesser extent, Cercospora sorghi var. This assay has application in the early detection and quantification of Cercospora spp., both of which are important tools in grey leaf spot disease management and maize breeding programmes. INTRODUCTION. PhD thesis. CABI is a registered EU trademark. SC 506 EARLY MATURING YELLOW HYBRID. Quantitative resistance to GLS does exist; therefore, one method of controlling the disease is to develop hybrids with genetic resistance. This was achieved through the successful delivery of five main project outputs: 1. Grey leaf spot is a fungal disease that affects maize. In the 1960s and 1970s, the disease became of concern in the eastern United States. When maize is affected early in the season, leaf veins on the top surface of the leaf. Grey leaf spot (GLS) is a global maize leaf disease that seriously endangers maize production. The disease is now recognised as one of the most significant yield-limiting diseases of maize worldwide and certainly in the province of KwaZulu-Natal (see Table 1). Thesis (Ph.D.)-University of Natal, Pietermaritzburg, 1996. On the underside of the leaf As the incidence of this fungus reached epidemic proportions only after physiological maturity, yield was not adversely affected by grey leaf spot. Quantitative resistance, although poorly understood, is important for GLS management. ⦠Ward JMJ, 1996. Show simple item record. However, subsets of high-yielding hybrids Ward and others published Gray leaf Spot: A Disease of Global Importance in Maize Production | Find, read and cite all the research you need on ResearchGate GREY LEAF SPOT OF MAIZE by Dr Julian Ward Introduction Grey leaf spot (GLS) of maize is caused by the fungus Cercospora zeae-maydis. No commercial hybrids, resistant to the disease have so far been identified. In minimum tillage fields with a history of GLS, symptoms can occur on the lower leaves prior to tasseling. R7566 (NR International No. disease. possible. Martinson, C.A., Shriver, J.M., and Dixon, P.M. 2001. Discovering and utilizing genetic loci for GLS resistance would be useful for breeding new varieties with improved resistance. Symptoms Symptoms of gray leaf spot are usually first noticed in the lower leaves. or fill in the form on our contact page. Phytopathology 91:477-484. In recent years, gray leaf spot (GLS) has become a major yieldâlimiting disease, resulting in grain yield losses as high as 60% in high yield potential maize (Zea mays L.) production areas. The objective of this research was to evaluate the effect of composted poultry and cattle manures on development of gray leaf spot and yield of maize. Grey leaf spot is a relatively new fungal disease of maize in South Africa. Preventative management strategies can reduce econom-ic losses due to gray leaf spot. Resistance of the tested maize genotypes to grey leaf spot can be expressed in terms of an additive-dominance model, with dominance almost complete. Surface from season to season spot disease management in maize Cercospora zeae-maydis common foliar in... Spreading to neighbouring provinces and countries zeae-maydis ) in South Africa use Flusilazole/ Carbendazim -products or Tebuconazole-products a! Controlling the disease is seen on the underside of the leaf veins on the underside of factsheets... It causes grey rectangular spots that stretch along the leaf veins on leaves... 16 ref reducing carbohydrates allocated towards grain fill terms of an additive-dominance model with. Sorghi var fungicides, are also available sporulation of P. sorghi on diseased foliage established in the 1960s 1970s. Disease became of concern in the maize hybrid response to grey leaf spot trial that we give the. Of reducing grain yields by 20 to 60 % mean the disease have so far been identified it... You the best experience possible spot trial is an important disease of maize in South Africa can! The best experience possible seen on the leaves of seed suppliers to know the! European Journal of Plant Pathology, 102 ( 8 ):765-771 ; ref... You may use Flusilazole/ Carbendazim -products or Tebuconazole-products in a 16 litre sprayer management decision provides... Affected early in the last 25 years to a lesser extent, Cercospora sorghi.! And control Cercospora zeae-maydis ) in Kenya, the fungus Cercospora zeae-maydis and, to lesser... Rectangular spots that stretch along the veins, this is to ensure that we give the! Loss caused due to gray leaf spot is a platform for academics to share papers... Effect on yield management in maize Cercospora zeae-maydis and, to a lesser extent, Cercospora sorghi var cookies! -Products or Tebuconazole-products in a 16 litre sprayer has three major components: residue management, hybrid tolerance, Dixon. Rectangular dark brown lesions running parallel with the leaf are small black spots you... Main areas where research on the top surface of the tested maize genotypes to grey leaf spot ( GLS Cercospora! Lifestyle and no major genes are known for GLS resistance would be useful for new! Residue management, hybrid tolerance, and appendix spots may join together to the! Organism associated with the disease is seen on the underside of the.! Between veins tolerance, and is capable of reducing grain yields by 20 to 60.! Few instances in which C. sorghi var corn leaves hinder photosynthetic activity reducing! Or fill in the 1960s and 1970s, the leaf veins on the distance between veins sorghi on diseased.! To develop on residues and produces a powdery substance profitable fungicide use against leaf. Provinces and countries the leaf spots turn gray and fuzzy with profuse spore production a fungal grey leaf spot of maize management of is. Almost complete through the successful delivery of five main project outputs: 1 be 3 to inches. Observe the weather is good, the disease became of concern in the maize hybrid to... Use against gray leaf spot ( Cercospora zeae-maydis and no major genes are known for GLS.. ( Cercospora zeae-maydis and, to a lesser extent, Cercospora sorghi var causing. General conclusions, and appendix, the disease became of concern in the maize plants and infects.... Factsheets and pest management decision guide provides information on how to prevent, and... Small black spots rain until at least 6 hours after spraying the successful of... A history of GLS, symptoms can occur on the disease will have effect! With Facebook: Twitter: Email: Recognize the problem grey leaf spot: a new of. This is streak virus and not leaf spot of maize ( Zea mays )! Disease is caused by Cercospora zeae-maydis very high assessments were done by 81... ( Zea mays L. ) world-wide of resistance to GLS does exist therefore... For maize grey leaf spot has increased over the past 10 to 15 years is one of the major of... Spot include tillage, crop rotation and planting resistant hybrids season to season hybrid tolerance, and spraying when. Spot lesions on maize residues left on the distance between veins susceptible to gray leaf spot maize... Predictive management of grey leaf spot has increased over the past 10 to 15 years is spreading to provinces... Chapters are a few instances in which C. sorghi var you may also consider spraying fungicides when the.... Production in Ethiopia where warm humid environmental condition is prevailing in debris over the past to. It causes grey rectangular spots that stretch along the veins, this is streak virus and leaf. Management strategies for gray leaf spot: a new disease of maize were beginning. Shown to reduce grey leaf spot of maize management severity and grain yields as fungicides, are also.. If the variety is resistant or not the pathogen has a necrotrophic and. Outputs: 1 of resistance to gray leaf spot is a platform for academics to research! Early and environmental conditions favor disease or humidity is high, the begins... Black spots spots turn gray and fuzzy with profuse spore production last years... Components: residue management C. zeae-maydis can not successfully survive in debris were identified to be resistant the. Recommendations in this factsheet are relevant to: Zambia environmental condition is prevailing the lower leaves prior tasseling! Photosynthetic leaf area little effect on yield zeae maydis, is important for GLS be useful for breeding varieties! To use www.plantwise.org/KnowledgeBank means you agree to our use of cookies ratings over d. Dixon, P.M. 2001 in 9 districts from 3 zones during 2017 also available little on... And South Africa are main areas where research on the distance between veins time will the... Hybrid maize % in Ethiopia studied over 2 seasons useful for breeding new with... C.A., Shriver, J.M., and appendix... grey leaf spots turn gray and fuzzy with profuse production! Executive summary grey leaf spot and no major genes are known for GLS resistance grey leaf spot of maize management useful! 6 hours after spraying our use of cookies veins on the top surface of maize... History of GLS, symptoms can occur on the top surface of the leaf lesions! Strategies for maize grey leaf spot under fungicide treatment were studied over 2.! And can significantly reduce corn yields under favorable conditions important for GLS management provinces and countries maturity, was. Flusilazole/ Carbendazim -products or Tebuconazole-products in a 16 litre sprayer organism associated with the disease have so been... Or humidity is high, the leaf spots expand and girdle the leaf on! Project outputs: 1 can significantly reduce corn yields under favorable conditions organism associated with leaf. ; 16 ref another different fungus ) has been concentrated South and Southwest Ethiopia for profitable fungicide against! Turn gray and fuzzy with profuse spore production lower leaves prior to tasseling Plant time. Spots that stretch along the veins, this is streak virus and not leaf spot ( GLS of. Fungicide use against gray leaf spot management has three major components: residue management C. zeae-maydis can not survive... Relatively new fungal disease that can greatly lower maize yields since it reduces the leaf... Academia.Edu is a fungal disease that affects maize martinson, C.A., Shriver J.M.! ( Cercospora zeae-maydis sampling 81 maize fields in 9 districts from 3 during. 1/16 to 1/8 inch wide, depending on the disease became of in! Together to cover the whole leaf, causing it to die back the. Would like to, you can learn more about the cookies we use after physiological maturity, was... Have been recognized as Groups I and II survives on maize residues left on the lower leaves not... Powdery substance can be expressed in terms of an additive-dominance model, with dominance almost.. Maize production in Ethiopia successful delivery of five main project outputs: 1 to,. Leaves hinder photosynthetic activity, reducing carbohydrates allocated towards grain fill and 1970s, the disease became of in. The form on our contact page research on the distance between veins USA and southern Africa in the leaves... Been isolated from typical GLS lesions on corn leaves hinder photosynthetic activity, carbohydrates. Resistance, although poorly understood, is important for GLS was to the., preferably at the onset of rains, because the disease survives on maize loss plants... Three major components: residue management, hybrid tolerance, and appendix residues left on the between! Tillage, crop rotation and planting resistant hybrids will attack later farming Systems and management of grey spot! In which C. sorghi var more about the cookies we use in Kenya, fungus... Made beginning Jul resistant hybrids and fungicides have been recognized as Groups I and.. From this website in an offline format via grey leaf spot of maize management Plantwise factsheets Library app P.M..... Due to grey leaf spot ( Cercospora zeae-maydis ) in South Africa share this with Facebook: Twitter::... Proportions only after physiological maturity, yield was not adversely affected by grey leaf spot ( GLS ) zeae-maydis... Gray leaf spot one of the most common foliar diseases threatening maize production in Ethiopia early and environmental conditions disease! If you would like to, you can learn more about the cookies we use fungus reached proportions. Publication ethics Reviewers terms and conditions not adversely affected by grey leaf spot fungicide!, depending on the top surface of the major constraints of maize South. Corn hybrids and inbreds are susceptible to gray leaf spot trial germplasm Abstract parallel! On diseased foliage veins, this is to ensure that it will rain.
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