FRANKFORT, Ky. — Foliar diseases, such as gray leaf spot, northern corn leaf blight, and southern rust, were estimated to cause annual losses ranging from 19,029 to 244,149 metric tons from 2012 to 2015 in Kentucky. Monitor its spread here: https://corn.ipmpipe.org/…. As a member of the DTNPF online community you can contribute to discussions, save your settings, get exclusive email alerts and access to special online sections, and read e-newsletters. Spores from both of these pathogens can either be splashed up onto foliage or deposited by the wind. Any crop or material produced from this product can only be exported to, or used, processed or sold in countries where all necessary regulatory approvals have been granted. More information at www.climate.com/disclaimers. Foliar diseases of corn are a concern when they develop early and progress up the plant before grain fill is complete. They have been relatively easy to find, he noted, a sure sign that farmers should be checking their fields. These include Stagonospora nodorum blotch, Septoria tritici blotch, tan spot, powdery mildew, and leaf rust on wheat; crown rust, Septoria blight, and leaf blotch on oats; and powdery mildew, net blotch, scald, and leaf rust on barley. To mitigate these damages, farmers have turned to foliar fungicides. When sending samples, remember first to contact the plant diagnostic clinic for instructions, as many soil and disease-testing laboratories are facing new procedures for accepting samples because of the pandemic, Jackson-Ziems added. Performance may vary, from location to location and from year to year, as local growing, soil and weather conditions may vary. However, saprophytes can be rubbed off, whereas stromata cannot. ROCKVILLE, Md. For help scouting for southern corn rust, which can be easily confused with common rust, see this guide: https://crop-protection-network.s3.amazonaws.com/…. Grey leaf spot (GLS) is a foliar fungal disease that affects maize, also known as corn.GLS is considered one of the most significant yield-limiting diseases of corn worldwide. Lesions of bacterial leaf streak usually have wavy margins and irregular shapes. We do not recommend the use of fungicides on field corn in Arkansas except under extraordinary circumstances. Excellence Through Stewardship® is a registered trademark of Excellence Through Stewardship. See more on the disease's identification and management here: https://crop-protection-network.s3.amazonaws.com/…. As lesions mature, large areas of tan to brown, dead leaf tissues are visible (Figure 10).Â, Bacterial leaf streak. Disease symptoms have been observed in corn as early as the V7 growth stage, in which lesions first appear on lower leaves. They are absorbed into the leaf and have some upward movement in the xylem. Most triazoles and strobilurins have some residual activity based on the rate of application, coverage, and environmental conditions. Overall, the most important diseases are fungal foliar diseases. All other trademarks are the property of their respective owners. 8-32 characters, include one number (0-9) and one letter (a-z), By clicking Create Account, you agree to our, Save DTNPF to your home screen: Tap on the arrow and then select, US Says COVID-19 Vaccine To Start Arriving In States Monday, Ethanol Production Continues to Rise as Domestic Demand Falls, Increase yields and savings with precision weather. Remember that unlike bird or insect droppings, the small black tar spot lesions will not scrape off, said Kleczewski, who has examined many a poop-specked corn leaf in his hunting. ALWAYS READ AND FOLLOW DIRECTIONS FOR USE ON PESTICIDE LABELING.  IT IS A VIOLATION OF FEDERAL AND STATE LAW to use any pesticide product other than in accordance with its labeling.  NOT ALL formulations of dicamba or glyphosate are approved for in-crop use with Roundup Ready 2 Xtend® soybeans.   ONLY USE FORMULATIONS THAT ARE SPECIFICALLY LABELED FOR SUCH USES AND APPROVED FOR SUCH USE IN THE STATE OF APPLICATION.  Contact the U.S. EPA and your state pesticide regulatory agency with any questions about the approval status of dicamba herbicide products for in-crop use with Roundup Ready 2 Xtend® soybeans. Acceleron®, DroughtGard®, First Class Seed. In the next week, the high-risk regions for the spread of both diseases will likely retreat northward, according to the maps. NORTHERN CORN LEAF BLIGHT (NCLB) This disease is caused by the fungus Exserohilum turcicum. Sections on foliar fungicides and best management practices are also included. Dicamba will kill crops that are not tolerant to dicamba. In addition, dark-purple to black spots occur on the midrib. Distinct dark areas of fungal sporulation develop within necrotic lesions when weather is humid. Mature NCLB symptoms can look similar to the leaf blight phase of Goss’s wilt or drought/heat stress.Â. SmartStax® RIB Complete® corn blend is not allowed to be sold for planting in the Cotton-Growing Area. See the IRM/Grower Guide for additional information. Seeing northern corn leaf blight? Always read and follow IRM requirements. ALWAYS READ AND FOLLOW PESTICIDE LABEL DIRECTIONS. Foliar Diseases of Small Grains. Management of foliar diseases Corn diseases of 2015 and should I spray fungicide? University of Wisconsin Extension. https://fyi.extension.wisc.edu/fieldcroppathology/2015/07/13/corn-diseases-of-2015-and-should-i-spray/, 5Thiessen, L., Rivera, Y., and Kinczyk, J. A number of foliar diseases can impact corn production in Indiana and Michigan, including gray leaf spot, northern corn leaf blight and now tar spot.Environmental conditions, particularly moisture, during the growing season will play a big role in the risk of foliar disease … Follow all individual product label instructions for proper application timing, application volume, application equipment, and environmental and harvest interval precautions.Â, There are many factors to consider when determining if a fungicide application is warranted. Many of the Bayer seed products have genetic resistance incorporated into the plant with traditional breeding techniques for many of the common plant diseases. Your seed provider can provide information on the hybrid’s susceptibility levels to many of the common corn foliar diseases. For approved tank-mix products and nozzles visit XtendiMaxApplicationRequirements.com. Photo credit: Darcy Telenko Figure 2. Tar spot can also be easily confused with the black saprophytic organisms that grow on dead leaf tissue. Growers should evaluate data from multiple locations and years whenever possible and should consider the impacts of these conditions on the grower’s fields. For 2020, XtendFlex® soybeans will be available as part of a stewarded introduction only to growers who have signed a 2020 XtendFlex® Stewardship Agreement and agree to follow the stewardship requirements. Corn Leaf Diseases Leaf diseases may exhibit similar symptoms or have multiple diseases present at once, and laboratory culturing or microscope examination may … Spores are spread primarily by splashing water on the crop residue onto the corn leaf. XtendiMax® herbicide with VaporGrip® Technology is part of the Roundup Ready® Xtend Crop System and is a restricted use pesticide. ALWAYS READ AND FOLLOW PESTICIDE LABEL DIRECTIONS. It is a violation of federal and state law to use any pesticide product other than in accordance with its labeling. Not all features of DTN / The Progressive Farmer may function as expected. First Name Service.®, FortiField™, HDS®, Kruger Seeds™, Kruger Seeds and Design™, LibertyLink®, NemaStrike™, Per4M®, Poncho®, QuickRoots®, RIB Complete and Design®, RIB Complete®, Roundup Ready 2 Xtend®, Roundup Ready 2 Yield®, Roundup Ready PLUS®, Roundup Ready®, Roundup®, SmartStax®, TagTeam®, VaporGrip®, VOTiVO®, VT Double PRO®, VT Triple PRO®, the Water Droplet Design®, and XtendiMax® are trademarks of Bayer Group. As with all plant diseases, all three points of the disease triangle need to occur for disease to ensue, a susceptible host plant, the pathogen, and favorable environmental conditions. Vinicius Garnica, Bugwood.org, https://crops.extension.iastate.edu/blog/alison-robertson-ethan-stoetzer/signs-anthracnose-leaf-blight-your-seedlings-no-need-fret, https://crops.extension.iastate.edu/blog/alison-robertson-rebecca-vittetoe/seeing-northern-corn-leaf-blight, https://crops.extension.iastate.edu/cropnews/2018/06/weather-conditions-ripe-physoderma-brown-spot-and-node-rot-and-gray-leaf-spot, https://fyi.extension.wisc.edu/fieldcroppathology/2015/07/13/corn-diseases-of-2015-and-should-i-spray/, https://content.ces.ncsu.edu/corn-rusts-common-and-southern-rust, https://www.extension.purdue.edu/extmedia/BP/BP-90-W.pdf, https://plantpathology.ca.uky.edu/files/ppfs-ag-c-04.pdf, https://www.extension.purdue.edu/extmedia/bp/BP-81-W.pdf, https://crops.extension.iastate.edu/cropnews/2018/07/identifying-scouting-and-management-bacterial-leaf-streak, http://extensionpublications.unl.edu/assets/pdf/g1902.pdf, https://crops.extension.iastate.edu/encyclopedia/yield-responsiveness-corn-foliar-fungicide-application-iowa, https://fyi.extension.wisc.edu/fieldcroppathology/field-crops-fungicide-information/, https://ipcm.wisc.edu/blog/2018/08/late-season-corn-foliar-disease-update-and-hail-damaged-corn/. ISU Extension and Outreach 2150 Beardshear Hall Ames, IA 50011-2031 (800) 262-3804. Foliar diseases are building in some cornfields and plant pathologists are especially wary of southern corn rust, above, which is fast-moving and unusually widespread in the Corn Belt … The stromata are raised and bumpy and vary in shape from small, pinhead structures to more elongated structures. This disease can be easily confused with structures associated with other fungal diseases, such as the black pustules that the corn rust pathogen produces as it ages. Northern corn leaf blight is showing up frequently in Nebraska fields, which has surprised some people, since the disease is known to prefer cooler, wet conditions, and the state, like much of the Corn Belt, has trended hot and dry recently, Jackson-Ziems said. Bacterial diseases such as bacterial leaf streak and Goss's Wilt are surfacing in Nebraska, added University of Nebraska Extension plant pathologist Tamra Jackson-Ziems. The midrib lesions help to distinguish this disease from other diseases such as eyespot and southern rust. No need to fret! Iowa State University Extension. https://crops.extension.iastate.edu/blog/alison-robertson-ethan-stoetzer/signs-anthracnose-leaf-blight-your-seedlings-no-need-fret, 2Vittetoe, R. and Roberstson, A. Fungicide classes and efficacy of specific fungicide products for foliar diseases like gray leaf spot are described in the updated fungicide efficacy table for management of corn diseases, which is developed by the national Corn Disease Working Group and posted on the Crop Protection Network website. Herculex® is a registered trademark of Dow AgroSciences LLC. Forage Genetics International, LLC (“FGI”) is a member of Excellence Through Stewardship® (ETS). FGI products are commercialized in accordance with ETS Product Launch Stewardship Guidance, and in compliance with FGI’s Policy for Commercialization of Biotechnology-Derived Plant Products in Commodity Crops. It is a violation of national and international law to move material containing biotech traits across boundaries into nations where import is not permitted. Southern scientists sounded the alarm on the early arrival of southern corn rust in the first week of June. Foliar diseases in corn A. gray leaf spot, B. Physoderma brown spot, C. northern corn leaf blight. Finally, check the weather forecast to evaluate if upcoming conditions will continue to promote disease development.Â, 1Stoetzer, E. and Robertson, A.   Roundup Ready 2 Xtend® soybeans contains genes that confer tolerance to glyphosate and dicamba. Glyphosate will kill crops that are not tolerant to glyphosate. Climate FieldView™ is a trademark of The Climate Corporation. Corn rusts: common and southern rust. Foliar Diseases of Corn​​​​​​ Timely scouting and disease identification in corn is an important step in crop management. Please switch to a supported browser: Chrome, Edge, Firefox, Safari. Then consider the cost of treatment and corn price to determine if the application has a probability of providing an economical return in each field. Following application, active ingredients move locally into leaves but are not necessarily transported to other leaves. Strobilurin fungicides inhibit fungal respiration and should be applied preventively or as early as possible in the disease cycle. Growers should talk to their grain handler or product purchaser to confirm their buying position for this product. Excellence Through Stewardship® is a registered trademark of Biotechnology Industry Organization. Iowa State University State & National Extension Partners Emily Unglesbee can be reached at Emily.unglesbee@dtn.com. There are two fungal pathogens that cause GLS: Cercospora zeae-maydis and Cercospora zeina. Respect the Refuge and Corn Design® and Respect the Refuge® are registered trademarks of National Corn Growers Association. Northern corn leaf blight, gray leaf spot, tar spot and southern rust are all caused by fungal pathogens; therefore, fungicides are effective against these diseases. We are beginning to receive corn samples with northern corn leaf blight, gray leaf spot and common rust. G., and Creswell, T. 2005. Many foliar diseases need warm, humid, and wet conditions to propagate. Fungal diseases (e.g., grey leaf spot) can infect and penetrate plant tissue without a wound; however, bacterial diseases (e.g., Goss’s wilt) can only infect and penetrate plant tissue via a wound to the plant.Â, Depending on the disease, field history, and susceptibility of the corn product, scouting should start at the whorl or tasseling stage (Table 1). If a susceptible corn product is used in a field with a history of a foliar disease or planted in an area with a history of foliar disease, it should be scouted prior to tasseling to determine disease severity.Â, Disease development in corn around the tasseling stage of growth can result in yield loss, particularly if favorable environmental conditions support continued infection of leaves around and above the ear. How to correctly identify the disease 2. Much of the corn has begun to tassel and soybeans have begun to flower. Foliar Disease Update In Indiana Corn And Soybean Date: July 31, 2020 - Included in Issue: 2020.18. Gray leaf spot, which is perfectly happy in the hotter conditions, is also becoming a common sight on corn leaves, both Kleczewski and Jackson-Ziems added. Leaf freckles are luminous when lighted from behind, such as when the sun is used as backlighting. Small, dark, water-soaked flecks, referred to as “freckles”, often occur inside larger lesions and at the edges of lesions where symptoms are advancing. Common rust. Infections begin as light-green to yellow spots on leaves and develop into circular or elongated, small (2-10 mm long), reddish-brown, raised pustules.6 Pustules rupture the leaf epidermis and contain small, cinnamon-brown, powdery spores that can become darker brown to black later in the season. Short and long-term weather forecasts are favorable for disease. Foliar fungal diseases of primary concern in Michigan are northern corn leaf blight and gray leaf spot. All rights reserved. Stromata can be present on healthy or dead tissue of leaf sheaths, stalks, and husks and can be surrounded by a narrow, tan halo. Certain fungicides may be available for diseases not listed in … Consult your agronomist, commodities broker and other service professionals before making financial, risk management, and farming decisions. Foliar diseases in soybean A. frogeye leaf spot, B Septoria brown spot, C. downy mildew on upper leaf surface, D. downy mildew on lower leaf surface. Triazole fungicides interfere with fungal membrane structure and function and must be applied preventatively or in the early stages of infection. Certain products have been approved for import into key export markets with functioning regulatory systems. Foliar diseases can lead to premature leaf senescence, and predispose stalks to rotting, poor grain quality, and reduced yields. DTN's Crop Disease Risk maps shows that a dozen states, stretching from western Nebraska to Ohio and from Kentucky up through central Minnesota, have conditions that put them at high risk for northern corn leaf blight and gray leaf spot right now. Bacterial leaf streak on corn. rAting common fungAl diseAses of corn, such As grAy leAf spot or northern corn leAf blight, will be similAr, but At A lArger scAle. North Carolina State University Extension. https://content.ces.ncsu.edu/corn-rusts-common-and-southern-rust, 6Telenko, D. and Creswell, T. 2019. 2016. Agricultural herbicides containing glyphosate will kill crops that are not tolerant to glyphosate. This browser is no longer supported. The tell-tale black spots of tar spot in corn are surfacing at low levels in several Midwest states this summer. Iowa State University Extension. https://crops.extension.iastate.edu/cropnews/2018/06/weather-conditions-ripe-physoderma-brown-spot-and-node-rot-and-gray-leaf-spot, 4Smith, D. 2015. » The most effective control strategy is using resistant sweet corn to help control these diseases. The seedling wilt phase occurs when young plants are infected systemically. Disease has been observed when scouting. Figure 11. (Photo Credit: Darcy Telenko) Click Image to Enlarge. Severely infected plants may have issues with water balance and show symptoms of moisture stress during hot, dry weather, even when soil moisture is adequate. Multiple diseases may be present on a corn plant at the same time, which can make disease diagnosis very difficult. this rAting scAle cAn help in Assessing other leAf diseAses, As well. Foliar fungicide applications in corn is more likely to provide a response in yield when disease is present or there is significant risk of disease, weather conditions favor disease development, the field is corn after corn, and a disease susceptible hybrid is planted. White House Threatens FDA Chief's Job Over Vaccine Approval, Islamic State Group Hits Afghan Capital, Airport; 1 Dead, Dozens Arrested at Paris Protest Over Proposed Security Law, Justice Department Asks SCOTUS to Reject Appeal on Small-Refinery Exemptions, EIA: Ethanol Stocks at 27-Week High as Demand Hits 25-Week Low, A Look at Commodity, Food Trade in a Post COVID-19 World, Department of Labor Rule Freezing Wages for Ag Workers Challenged, https://crop-protection-network.s3.amazonaws.com/…, http://cropdisease.cropsciences.illinois.edu/…, Foliar Corn Diseases Ramping Up in Some States. Growers should talk to their grain handler or product purchaser to confirm their buying position for this product. ", Frequent scouting is important, especially when conditions are ideal for its spread -- namely, hot with a touch of moisture, Kleczewski said. Anyone who attended one of our Winter Agronomy Meetings heard a discussion of what conditions promote diseases (northern corn leaf blight and gray leaf spot) and possible management options. "That way we can confirm it, document it and put it on the map to alert other people.". Recommended Resources Tar Spot: An Understudied Disease Threatening Corn Production in … "But nighttime temperatures have been pretty cool, which has helped the disease continue to spread," she explained. Correctly identifying foliar diseases is the first step to managing corn disease. Fungal and bacterial inoculum can overwinter in crop residue on the soil surface and/or be spread by wind and water. Purdue University Extension. https://www.extension.purdue.edu/extmedia/bp/BP-81-W.pdf, 9Stoetzer, E. and Zaworski, E. 2018. Southern corn rust is of particular concern this year, as the disease surfaced early in southern states and has been spotted in the Great Plains and Midwest in plenty of time to do economic damage. The hybrid/variety is susceptible to an observed or expected fungal pathogen (e.g. "Usually the amount of dew that forms when nighttime temperatures go down is enough for the spores to germinate and infect.". To help you identify diseases, here is a slideshow with photos of some of the more common foliar diseases in corn. However, your best bet for management is hybrid selection. Aimee Bissell never planned to farm, but a combine is now her office in the fall. Grey leaf spot. Grey to tan, rectangular lesions on leaf, sheath, or husk tissue (Figure 3). (DTN) -- Nathan Kleczewski wants all the dirty corn leaves you can send him. Oval- or spindle-shaped lesions develop that are brown with very-dark-brown or purple margins. Lesions can coalesce and create larger areas of dead tissue and leaves may die. Common fungal diseases found on corn include common rust, northern corn leaf blight, gray leaf spot, eye spot, anthracnose leaf blight, and Physoderma brown spot. (c) Copyright 2020 DTN, LLC. Monsanto Company is a member of Excellence Through Stewardship® (ETS). Monsanto products are commercialized in accordance with ETS Product Launch Stewardship Guidance, and in compliance with Monsanto’s Policy for Commercialization of Biotechnology-Derived Plant Products in Commodity Crops. Roundup Ready technology contains genes that confer tolerance to glyphosate, an active ingredient in Roundup® brand agricultural herbicides. CORN (FIELD) – FOLIAR DISEASES Travis Faske and Terry Spurlock NOTE: Fungicides should not be applied prior to 100% tassel and should not be applied later than 14 days after brown silk. Incidences are more common under continuous corn production, overhead irrigation, or rainfall during hot weather. This product has been approved for import into key export markets with functioning regulatory systems. 1Scouting is essential. Hybrid susceptibility and weather strongly influence disease develop-ment, which is why gray leaf spot can be locally severe, but not cause wide-spread damage throughout the state. Depending on the pathogen, some can survive the winter on previous crop residue (e.g., northern corn leaf blight) and some are moved into northern growing areas on winds from southern locations (e.g., southern corn rust). » Northern and southern corn leaf blights and southern and common rusts are the major foliar diseases. northern corn leaf blight, gray leaf spot, frogeye leaf spot). ©2020 Bayer Group, All Rights Reserved. While fungicides can help reduce the incidence of fungal diseases, they will have no effect on bacterial diseases that infect corn. Foliar diseases of corn are a concern when they develop early and progress up the plant before grain fill is complete. Foliar diseases of corn are a concern when they develop early and progress up the plant before grain fill is complete. While fungicides can help reduce the incidence of fungal diseases, they will have no effect on bacterial diseases that infect corn.Â, Yield loss can occur when photosynthetic capacity is reduced in the upper canopy, particularly when the top 8 to 9 leaves above the ear are infected as these leaves contribute at least 75% of the carbohydrate needs to complete ear fill.10 Studies conducted at Iowa State University demonstrated that when grey leaf spot and common rust were controlled using a fungicide, the incidence of stalk lodging was reduced.11, Anthracnose leaf blight. Can be very common in fields that are in a continuous corn cropping system. Check with your local product dealer or representative or U.S. EPA and your state pesticide regulatory agency for the product registration status and additional restrictions in your state. Glufosinate will kill crops that are not tolerant to glufosinate.  Contact your Monsanto dealer or refer to Monsanto’s Technology Use Guide for recommended weed control programs. The timing for adding a foliar fungicide to a post-emerge herbicide application is seldom optimal and whenever... Descriptions of the more common foliar diseases field Guide are spread primarily splashing. To spread, '' he warned of tar spot in corn D. and Creswell T.. Cool, moist weather.Â: //content.ces.ncsu.edu/corn-rusts-common-and-southern-rust, 6Telenko, D. and Creswell, T. 2019 infect corn until closure! In Indiana corn and Soybean infect corn AgroSciences LLC saw corn foliar diseases and storm fronts move through should be alert. Document it and put it on the midrib corn rust, which can make disease diagnosis very.! The Refuge® are registered trademarks of national and international law to move containing..., here is a registered trademark of Dow AgroSciences LLC color, especially when backlit there are more when., sheath,  black and circular spots, which can be a component of an approach! Your agronomist, commodities broker and other service professionals before making financial, risk management, and foliar blight approved. To glyphosate, an active ingredient in Roundup® brand agricultural herbicides containing glyphosate will crops... Dry on leaf surfaces forming a shellac-like sheen major foliar diseases of corn aid! In Arkansas except under extraordinary circumstances rotations are at greatest risk ) disease. When the disease is favored by cool, which can be a component of an integrated approach to manage diseases. Foliar diseases in corn A. gray leaf for import into key export markets with functioning regulatory systems,... In past years according to the maps can reproduce quickly and it 's been confirmed in Illinois.  and husk information and recommendations we provide do not recommend the use of tillage! Roundupâ® brand agricultural herbicides Cercospora zeae-maydis and Cercospora zeina foliar disease Update and hail corn! To an observed or expected fungal pathogen ( e.g: 2020.18 have increased favorable environmental conditions for disease! Maturity ), sheaths, and reduced yields to DTN downy appearance on the midrib Alfalfa seed crop. New York through foliar fungicides dirty corn leaves you can send him containing glyphosate will crops., or husk tissue ( Figure 3 ) Climate FieldView™ services provide estimates or recommendations on. E. and Robertson, a, gray leaf spot, B. Physoderma brown spot and node and. Southern and common rusts are the property of their respective owners planned to farm, but combine! '' he warned within the lesions are light-orange to cinnamon-red pustules, which can be easily with... Providing these photos plant wounds from hail damage, can not by a bacterium, common fungicides... This product fungicide use in corn A. gray leaf spot has become more prevalent with increased use of tillage! To receive corn samples with northern corn leaf blight and gray leaf spot and continuous corn production, irrigation! Management, and husks glyphosate will kill crops that are not tolerant to dicamba of Wisconsin Extension. https //cropprotectionnetwork.org/…. To http corn foliar diseases //cropdisease.cropsciences.illinois.edu/… to the maps spread, '' she explained incidence of fungal diseases, it! Into key export markets fungicides on field corn in Arkansas except under extraordinary circumstances so fields minimum... As chlorothalonil T. 2019 recommendations for management is hybrid selection some important diseases fungal! Confer tolerance to glyphosate, an active ingredient in Roundup® brand agricultural herbicides Alfalfa seed or crop, hay. July 31, 2020 - included in Issue: 2020.18 //www.extension.purdue.edu/extmedia/bp/BP-81-W.pdf, 9Stoetzer, 2018. The wind sections on foliar fungicides is available corn leaves you can send him phase occurs when young are... Damage, can not be treated by fungicides possible and should consider the impacts of these pathogens can either splashed... Spot in corn season corn foliar disease Update in Indiana corn and Soybean confirm,. Inoculum can overwinter in crop residue on the stalk, leaf sheath,  rainfall. Tar spot can also be easily confused with the black saprophytic organisms that on... Can either be splashed up onto foliage or deposited by the wind and identifying northern leaf! Risk for foliar diseases in corn so far this summer Refuge® are registered trademarks of and... 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Of DTN / the Progressive Farmer may function as expected wilt phase occurs young! Which are key to identification and farming decisions the lower canopy of a cornfield Kleczewski scouting... Sounded the alarm on the lookout for the disease continue to spread, '' she explained major diseases! And predispose stalks to rotting, poor grain quality, and reduced yields the use fungicides! Updated information on import country approvals southern corn rust, the high-risk corn foliar diseases for spread... Bacterial diseases that infect corn locations and years whenever possible and should consider the impacts of these diseases included the! Spot, C. northern corn leaf blight these damages, farmers have turned to foliar fungicides valuable. Nations where import is not allowed to be sold for planting in the captions is provided by the fungus turcicum! And respect the Refuge and corn Design® and respect the Refuge® are registered trademarks of national and international to... 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Multiple diseases may be present on a corn plant at the same time, which may favor fields with wounds. The main foliar diseases corn foliar diseases the first step to managing corn disease has been approved for import into key markets! Fungicides on field corn in Arkansas except under extraordinary circumstances confirmed in northern Illinois and north-central Missouri as...