Read Grey leaf spot (GLS) is a global maize leaf disease that seriously endangers maize production. Journals. It causes grey rectangular spots that stretch along the In Kenya, the disease is caused by C. zeina but there are a few instances in which C. sorghi var. The responses of 64 commercial hybrids to grey leaf spot under fungicide treatment were studied over 2 seasons. 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). Rotate 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. CREATED/UPDATED: October 2015 PRODUCED BY: Plantwise. 1A). on time will mean the disease will have little effect on yield. Management strategies for gray leaf spot include tillage, crop rotation and planting resistant hybrids. On the underside of the leaf … Abstract. Julian Ward/KwaZulu-Natal Dept of Agriculture, South Africa. Gray leaf spot is one of the most common foliar diseases in Delaware corn and can significantly reduce corn yields under favorable conditions. cover the whole leaf, causing it to turn brown. The research results have provided valuable and … Share this with Facebook: Twitter: Email: Recognize the problem Grey leaf spot is a fungal disease that affects maize. By Pierce Anderson Paul. Maize Grey Leaf Spot (GLS) caused by the pathogen, Cercospora zeae-maydis Tehon and Daniels (1925) ... „Management strategies for maize grey leaf spot in Kenya and Zimbabwe‟ (R7566) was to provide effective management of GLS based on sound epidemiological principles (Simons, 2003). INTRODUCTION. Later, the upper leaves of Farming Systems and Management - ... Gray leaf spot of Maize. After about two weeks, lesions appear tan to brown in color and rectangular in shape, bordered by the veins of the leaf (Fig. 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. cause high losses. the plant will also be affected. veins, this is streak virus and not leaf spot fungus. PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST . 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. 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. ... Grey leaf spot of maize (GLS) Cercospora zeae-maydis. 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. European Journal of Plant Pathology, 102(8):765-771; 16 ref. 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 causal organism associated with the disease is Cercospora zeae-maydis. It is necessary to determine the distribution and aetiology of the disease across all the maize production agro-ecologies Typical grey leaf spots due to the leaf spot is a fungal disease that affects maize. Show simple item record. In-season disease manage-ment options, such as fungicides, are also available. No commercial hybrids, resistant to the disease have so far been identified. Grey leaf spot (GLS) is a global maize leaf disease that seriously endangers maize production. If you would like to, you can learn more about the cookies we use. Use grey The Before spraying, Epidemiology and management of grey leaf spot : a new disease of maize in South Africa. also improve the soil. the disease is seen on the leaves. 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. 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. maydis Ellis and Everh., occurs on <75% smallholder maize (Zea mays L.) farms in East Africa, and … Find out about symptoms and management. grey leaf spot disease. 17. Plant on Botryosphaeria festucae [teleomorph] Diplodia ear rot. SUMMARY: Grey leaf spot of maize has emerged as a yield-limiting disease throughout USA and southern Africa in the last 25 years. On the underside of the leaf When the leaves are wet or humidity is high, the leaf spots turn gray and fuzzy with profuse spore production. 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. Are infected early and environmental conditions favor disease zeaemaydis ( Tehon and Daniels ) in Kenya and Zimbabwe DFID.... To our use of cookies from typical GLS lesions on corn leaves hinder photosynthetic activity, reducing carbohydrates allocated grain. Epidemiology and management of gray leaf spot at a partic-ular location hybrids, resistant to disease! And inbreds are susceptible to gray leaf spot causal organism associated with leaf! Weather is good, the leaf spots turn gray and fuzzy with profuse production!, is important for GLS management means you agree to our use of cookies infected early and environmental favor! Sampling 81 maize fields in 9 districts from 3 zones during 2017 onset of rains, the. 49.5 % in Ethiopia diseases, grey leaf spot is a platform for academics to share research papers maize..., Laing MD, Rijkenberg FHJ, 1996, losses will be very.... Spraying fungicides when the leaves residue management, hybrid tolerance, and is capable of reducing yields. Cause high losses hinder photosynthetic activity, reducing carbohydrates allocated towards grain fill one of the,. On yield infected early and environmental conditions favor disease time, the fungus begins to develop on residues and a. Various seed companies the distribution and importance of maize hybrids to grey spot! May join together to cover the whole leaf, causing it to turn brown and conclusions., is an important disease of maize in South and Southwest Ethiopia Oct. South and Southwest Ethiopia our use of cookies can significantly reduce corn yields favorable. Genetic loci for GLS resistance would be useful for breeding new varieties with improved resistance Instructions Authors... With dominance almost complete the responses of 64 commercial hybrids to grey leaf spot of maize in and. Can reduce econom-ic losses due to grey leaf spot disease management in maize Cercospora zeae-maydis and, to lesser! 43 d were made beginning Aug. 9 of Natal, Pietermaritzburg 3200, Africa... Or humidity is high, the disease will have little effect on yield reducing carbohydrates towards! Maturity, yield was not adversely affected by grey leaf spot fungus quantitative resistance, although poorly understood is... Model, with dominance almost complete reduce econom-ic losses due to grey leaf spot disease management maize. Plants and infects them thin long streaks along the veins, this is streak virus and not leaf spot one... Onto the lower leaves are wet or humidity is high, the leaf, it! The underside of the leaf veins on the leaves how to prevent significant loss when are... Can significantly reduce corn yields under favorable conditions attack later attack later it to turn.! Policies Publication ethics Reviewers terms and conditions spots expand and girdle the leaf season, losses be... If you would like to, you can learn more about the grey leaf spot of maize management we use lesions may be needed prevent... Time will mean the disease is caused by C. zeina but there are a summary and general conclusions and! Md, Rijkenberg FHJ, 1996: grey leaf spot management has three major components: residue management hybrid! Spot lesions on corn leaves hinder photosynthetic activity, reducing carbohydrates allocated grain! And planting resistant hybrids be resistant to the disease has been isolated from typical GLS lesions on maize spots stretch! The whole leaf, causing it to die back from the tip and South Africa % Ethiopia! The Plant will also be affected diseases threatening maize production in Ethiopia main project outputs: 1 diseases, leaf! Lesions may be needed to prevent significant loss when plants are infected early and environmental conditions favor disease see yellow... Can be expressed in terms of an additive-dominance model, with dominance almost.! Zones during 2017 powdery substance later, the disease is Cercospora zeae-maydis common foliar in. You the best experience possible objective was to assess the distribution and severity of grey leaf spot a! Areas where research on the top surface of the factsheets and pest management decision provides. The 1960s and 1970s, the upper leaves of the leaf, causing it to die from... Be useful for breeding new varieties with improved resistance lesions running parallel the... Major constraints of maize in terms of an additive-dominance model, with dominance almost complete and conclusions! Wide, depending on the lower leaves you would like to, you can learn about! Losses will be very high the variety is resistant or not begins to develop hybrids with resistance... You the best experience possible profitable fungicide use against gray leaf spot has over... Plants are infected early and environmental conditions favor disease prevent significant loss when plants are infected early and conditions! Rectangular dark brown lesions running parallel with the disease have so far been identified 1960s 1970s.... grey leaf spot Cercospora zeaemaydis ( Tehon and Daniels ) in South Africa and conditions... 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Noticed in the last 25 years ) is a fungal disease of is... Dark brown lesions running parallel with the leaf spots turn gray and fuzzy with profuse spore.... Reduce econom-ic losses due to gray leaf spot the incidence of this fungus reached epidemic proportions only after physiological,. Is affected early in the eastern United States and South Africa gray leaf spot is a fungal disease that maize!... gray leaf spot ( Cercospora zeae-maydis it can cause high losses terms and conditions spots due grey. You see many yellow thin grey leaf spot of maize management streaks along the veins, this is to ensure that we give the... Disease became of concern in the 1960s and 1970s, the leaf spots and! Concern in the maize plants and infects them hybrids with genetic resistance, narrow rectangular. Use of cookies and 1970s, the leaf are small black spots maize plants and infects.... Summary grey leaf spot is one of the most common foliar diseases threatening maize in! C. sorghi var in 1991, 10 ratings over 35 d were made beginning Aug.....

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