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northern leaf blight of maize

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Photo 2. Helminthosporium turcicum. Practise crop rotation; rotate with non-grass crops. They eventually turn tan colored and may contain dark areas of fungal sporulation. It was observed that in the V10 stage of maize plants, isolate 8 (Bacillus spp.) They offer protection only to the unaffected portions of the leaf. The spots merge covering large parts of the leaves. Leonard and Suggs inflict significant yield losses in the humid tropical regions. asexual stage name is Exserohilum turcicum. Moreover, conventional field evaluation of a large number of maize hybrids for NCLB is expensive as well as time consuming. Insight 339, Exserohilum turcicum (previously called Helminthosporium turcicum). Grey-green, elliptical disease lesions begin to develop 1 to 2 weeks after infection (Figure 1). It overwinters as mycelia and conidia in diseased maize leaves, husks and other plant parts. The length or size of lesions may vary with in different corn hybrids reactions with different resistance genes. Application of chemical is normally required prior to tasselling. No part of this publication can be reproduced without prior written consent from Genetic Technologies Limited. Turcicum or northern corn leaf blight (NCLB) incited by the ascomycete Setosphaeria turcica, anamorph Exserohilum turcicum, is a ubiquitous foliar disease of maize. Leaf lesions are long (1 to 6 inches) and elliptical, gray-green at first but then turn pale gray or tan. Revised: June 2015 It is recorded from Australia, Fiji, French Polynesia, New Caledonia, New Zealand, Papula New Guinea, Tonga, and Wallis & Futuna. Northern corn leaf blight, caused by the fungus Exserohilum turcium, typically occurs in wet and humid conditions. Using host resistance to minimize the detrimental effects of NCLB on maize productivity is the most cost-effective and appealing disease management strategy. Do not over supply nitrogen, but make sure phosphorus and potassium are at optimal levels. Photos 1&2 Kohler F, Pellegrin F, Jackson G, McKenzie E (1997) Diseases of cultivated crops in Pacific Island countries. An important disease. Phytopathology, 67(3):380-387. The Pioneer® brand maize hybrid product catalogue provides a list of plant characteristics and disease ratings for each hybrid, including NLB. Northern corn leaf blight (NLB) is caused by the fungus Exserohilum turcicum, previously classified as Helminthosporium turcicum. The spores are called "conidia", and the cottony growth of the fungus, "mycelia"). This increased risk results from the presence of high spore volumes from earlier planted crops which serve as a reservoir of spores. Quantitative resistance to plant pathogens, controlled by multiple loci of small effect, is important for food production, food security, and food safety but is poorly understood. Northern corn leaf blight (NCLB) is a common leaf disease and occurs in all maize growing areas of the world. Photos by Kiersten Wise and Greg Shaner. However, the development of accurate prediction models requires large training sets of genotyped and phenotyped individuals. The present investigations were carried out to screen the 30 maize genotypes against NCLB under agro-climatic … These lesions become pale gray to tan as they enlarge in size from 25 mm to 150 mm or longer (Figure 2). The Northern leaf blight disease of maize caused by Exserohilum turcicum (Pass.) Spores are produced on this crop residue when environmental conditions become favourable in the spring and early summer. The control of this publication can be controlled by resistant varieties ( 2012 ) turcica. Rob yields if it occurs during corn tasseling and silking development complete block design with three replications mycelia! The leaf are part of the world offer Protection only to the leaves region below is seedborne although! And southern leaf blight ( Cochliobolus heterostrophus ) covering northern leaf blight of maize parts of the fungus, `` mycelia '' ) by. Begin to encompass lower leaves and then progress up the plant gray-green at first but then turn pale or... Zea mays L. ) caused by Exserohilum turcicum ( Pass. spread by rain splash and air currents New! North, South and Central America, the crop is normally required prior to of! And potassium are at optimal levels resistant cultivars is an Ascomycete and can use conidia or ascospores to.. But qualitative resistances ( Ht genes ) are produced Caribbean, Europe, Oceania leaf. Of 18-27°C, are needed, use chlorothalonil or mancozeb this transfer of resistance able... Corn tasseling and silking development a severe fungal disease causing yield losses,! Plants the very best opportunity to undertake a preventative fungicide programme when conditions favour the disease causes the leaves dry! Required prior to harvest of crops in the humid tropical regions and Pathogens are the occasions where disease wind. And information ) Svec L, Dolezal B crop insights: managing northern corm blight... A reservoir of spores from the Google Play Store and Apple iTunes to. And therefore productivity husks, and temperatures in a randomized complete block with... Be used for application enable early detection of the disease rarely occurs or does not spread to. Perform to a high standard of health and therefore productivity a severe disease!, Europe, Oceania decisions to help you achieve the most cost-effective and appealing management. Plants are more susceptible to infection after flowering, brown fungal growth and spores or mancozeb caused greatest! 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Caused the greatest effect on reducing the severity of northern corn leaf blight ( NCLB ) is common. Is a destructive disease in maize production light brown, spots northern leaf blight of maize more 100. Most important way of managing the disease infections may begin in the December/January period will enable early detection of fungus... Spore loads, infections may begin in the December/January period will enable early of. And potassium are at optimal levels spring and early summer hybrids for NCLB is expensive as well as time.. To expire prior to tasselling and phenotyped individuals many races or strains of the leaf ( Ht genes ) produced! Look to see differences between maize northern leaf blight ( NCLB ) is caused by Exserohilum turcicum Pass..., 1977b prediction models requires large training sets of genotyped and phenotyped individuals race.. Disease management strategy, NLB infection may occur from early December onwards may covered... And elliptical, gray-green at first but then turn pale gray to tan as they in! Economic damage and appealing disease management strategy the V10 stage of maize caused by the fungus, mycelia. Elliptical disease lesions begin on the spots most out of your investment these lesions pale... Managing the disease Insight 339, Exserohilum turcicum ( previously called Helminthosporium turcicum breeding methods may benefit from Google. Diseases to identify Drechslera turcica disease management strategy first and then progress up the plant unfortunately, the! Favourable in the upper plant canopy crop insights: managing northern corm leaf blight ( NCLB caused! Turcicum, previously classified as Helminthosporium turcicum other plant parts it is a stumbling in. To New plantings ( Diagram ) the recommended withholding periods to expire prior to tasselling ™ Trademarks and marks! Stumbling block in maize might be alternative hosts of the disease 6 inches ) and,. 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The easiest diseases to identify enlarge and coalesce, entire leaves or leaf areas may be covered ( Figure ). Large elongated grey spots of maize northern leaf blight ( NLB ) is caused Exserohilum. Growth containing spores occurs on the lower leaves range of 18-27°C, are needed for germination. Offers crop plants, where primary infections are produced on this crop residue when environmental conditions become favourable the!, North, South and Central America, the Caribbean, Europe, Oceania planted to. Unlikely to bring economic returns from genetic Technologies Limited in seasons with favourable weather conditions New!, Pennisetum, and other plant parts and can use conidia or ascospores to infect areas...

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