17 MIN READ

Identification of Midwestern Corn Disease

February 21, 2021

The potential for corn seeds and plants to become infected with a disease is greatly determined by genetics, use of fungicidal seed treatments, environmental conditions, time in the growing season, and the presence of casual agents (fungal or bacterial pathogens, viral vectors, and nematodes).

Newly planted seeds are immediately subjected to pathogenic fungi and bacteria that inhabit the soil. In general, these pathogens have a greater potential for causing damage when soils are wet and cold; however, some pathogens prefer warm conditions. Infected seedlings may show signs of damping-off or rotting, stunting, yellowing leaves or loss of color, and deformities.

Susceptibility to diseases depends largely on the level of genetic resistance to a disease. Some seed products can have nearly complete resistance while others are very susceptible. When selecting seed products for planting, the historical disease presence should be considered, and seed selections made accordingly.

Foliar fungal diseases may become apparent anytime during the season depending on the presence of the pathogen. Many fungal pathogens can overwinter on or in infected residue and can contact plants via splashing rain or wind. Some fungal pathogens that are unable to overwinter can be carried from warmer southern areas into the Midwest on wind currents. Depending on the disease, foliar fungicides may provide control.

Bacterial diseases can also overwinter on infected residue. The bacterium can contact plants through water movement in the soil, splashing rain, wind-driven rain, and mechanical means such as cultivating when plants are wet. Infection occurs when bacterium enter the plant through wounds or natural tissue openings such as stomates.

Viral diseases rely on a vector such as aphids or thrips to infect a plant. As the vector feeds, infected juices are injected into plant tissue. Scouting for insects that have the potential to vector viral diseases and applying a timely insecticide may help protect plants from becoming infected via insect feeding. Caution should be taken not to spray insecticides without proper identification as many beneficial insects can be killed.

Additional harvest-time diseases include stalk and ear rots. Stalk rots can result in lodging that can diminish harvest speed, increase harvesting equipment wear and tear, decrease grain quality, and increase the potential for personal injury. Ear rots can affect grain quality, test weight, and marketability. Some ear rots produce toxins that can be harmful or even lethal to livestock and humans.

Nematodes are often discussed under the disease umbrella; however, they are microscopic parasitic worms that live outside (ectoparasitic) or within (endoparasitic) corn roots. Nematode infestations may go unnoticed, particularly under favorable growing conditions, or cause stunting, nutrient deficiencies, and create entrance wounds for other pathogens.

Click below on Seed and Seedling, Foliar, or Corn Nematodes to identify and learn about the corn diseases on your farm.

Fusarium-infected corn roots. Note discoloration on the mesocotyl
Fusarium-infected corn roots. Note discoloration on the mesocotyl.


Identification, Characteristics, and Diagnosis:

  • Caused by at least six Fusarium species.

  • Initially, infected seedling roots and the mesocotyl may be shriveled and have tan to reddish-brown lesions, which later become brownish to dark black and rotted.

  • Favored by wet and cool (55° F or lower) soils.

  • Most notable in early planted and reduced tillage fields.

Management:

  • Utilize fungicide-protected seed.

  • Plant into warm soils that are favorably dry.

  • Planting depth should not be too deep.





Penicilium Seedling Injury
Corn seedling roots infected with Penicillium fungi. Picture courtesy of William M. Brown, Jr., Bugwood.org


Penicillium leaf blight
Corn seedling with symptoms of Penicillium seedling blight. Picture courtesy of William M. Brown Jr., Bugwood.org.


Identification, Characteristics, and Diagnosis:

  • Caused by the fungus Penicillium oxalicum.

  • A bluish-green mold develops on seed causing roots to deteriorate (top).

  • Seedling leaves turn yellow and may die (bottom).

  • Favored by wet and cool (55° F or lower) soils.

  • Most notable in early planted and reduced tillage fields.

Management:

  • Utilize fungicide-protected seed.

  • Plant into warm soils that are favorably dry.

  • Planting depth should not be too deep.


Pythium Darkening of Mesocotyl
Darkened mesocotyl near the soil surface caused by Pythium. Picture courtesy of Don White, University of Illinois


Identification, Characteristics, and Diagnosis:

  • Caused by several Pythium species.

  • Favored by wet and cool (55° F or lower) soils.

  • Symptoms include dark, slimy lesions that cause roots or the mesocotyl to shrivel and the outer layer of roots may be rotted while inner tissues remain white and intact.

  • Most notable in early planted and reduced tillage fields.

  • Can infect anytime from planting to mid-season.

Management:

  • Utilize fungicide-protected seed.

  • Plant into warm soils that are favorably dry.

  • Planting depth should not be too deep.



Rhizoctonia seedling blight. Inoculated with Rhizoctonia slani AG-4 HG-II
Corn seedlings inoculated with Rhizoctonia solani AG-4 HG-II. Picture courtesy of Srikanth Kodati, University of Nebraska.


Identification, Characteristics, and Diagnosis:

  • Caused by the fungus Rhizoctonia solani.

  • Initial symptoms include brown lesions on the mesocotyl and roots of seedlings and young plants.

  • Later symptoms on older plants include reddish-brown, sunken cankers on crown and brace roots.

  • Plants may be stunted, chlorotic, or have no above ground symptoms.

  • Occurs more often in irrigated fields.

  • Favored by temperatures between 46 to 82° F.

Management:

  • Utilize fungicide-protected seed.

  • Plant into warm soils that are favorably dry.

  • Planting depth should not be too deep.




Click below on Viral, Stalk Rots, or Ear Rots to identify and learn about the corn diseases on your farm.

Corn Lethal Necrosis - Leaf 2
Corn lethal necrosis.


Identification, Characteristics, and Diagnosis:

  • Occurs when Maize chlorotic mottle virus (MCMV) and Sugarcane mosaic virus (SCMV) (formerly Maize dwarf mosaic virus (MDMV-B)) or Wheat streak mosaic virus (WSMV) infect the same plant.
  • The combination of MCMV and SCMV is more frequent.
    • Symptoms of the combination appear as a bright greenish-yellow leaf mottling that lasts until the end of the growing season.
    • Plants are susceptible at all stages of growth.
    • Coloration is usually not noticed until late June or early July and only occurs on the leaves that emerge after infection occurs.
    • Plants infected late in the season may exhibit poorly filled ears, have premature husk death, and lack leaf mosaic symptoms.

  • MCMV may be vectored by corn rootworm beetles (Diabrotica species) (laboratory research) and/or thrips (Franklinella species) (Hawaiian breeding nursery). Research has also noted a possible soil-borne mechanism for overwintering.

  • SCMV is vectored by greenbugs (Schizaphis species) and corn leaf aphids (Rhopalosiphum maidis).

  • WSMV is vectored by the wheat curl mite (Aceria tosichella (K.)).

  • Corn lethal necrosis has been identified in North Central Kansas and South Central Nebraska.

Management:

  • Scout for and manage the occurrence of greenbugs.

  • Crop rotation can greatly reduce the incidence of MCMV.

  • Plant seed products that demonstrate higher levels of tolerance.



High plains virus
High Plains virus. Picture courtesy of Howard F. Schwartz, Colorado State University, Bugwood.org


Identification, Characteristics, and Diagnosis:

  • Vectored by wheat curl mite (Aceria tosichella (K.)).

  • In the United States, the disease is found primarily in Eastern Nebraska to Western Idaho and from the Texas Panhandle to Central South Dakota.

  • Symptoms can vary depending on genetics, environment, timing of infection, and the complex of viruses.

  • Symptoms can include chlorotic spots on the leaves, stunting, and purple leaf tips and margins. Chlorotic spots form on lower leaves first and progress up the plant. Spots tend to form along vascular bundles in a linear fashion.

  • Usually occurs along with Wheat streak mosaic virus because they share the same insect vector.

Management:

  • Scout for and manage the occurrence of wheat curl mites.

  • Plant seed products that demonstrate higher levels of tolerance.



Maize chlorotic mottle virus lesions
Maize chlorotic mottle virus lesions, Gothenburg, NE. (9-17-2019)


Identification, Characteristics, and Diagnosis:

  • Symptoms include light-greenish mottling (alternating light- and dark-green areas) of leaves.

  • Symptomology resembles those of Maize dwarf mosaic virus (MDMV).

  • Largely a South American disease until discovered in North Central Kansas. Has also occurred in South Central Nebraska and Hawaii.

  • MCMV may be vectored by corn rootworm beetles (Diabrotica species) (laboratory research) and/or thrips (Franklinella species) (Hawaiian breeding nursery). Research has also noted a possible soil-borne mechanism for overwintering.

  • The disease has the potential to dramatically affect yield potential.

  • Favored by high temperatures and wet conditions.

Management:

  • Scout for and manage the occurrence of corn rootworm beetles.

  • Crop rotation can greatly reduce the incidence of MCMV.

  • Plant seed products that demonstrate higher levels of tolerance.



Maize chlorotic mottle virus lesions
Maize chlorotic mottle virus lesions, Gothenburg, NE. (9-17-2019)


Identification, Characteristics, and Diagnosis:

  • Symptoms include light-greenish mottling (alternating light- and dark-green areas) of leaves.

  • Symptomology resembles those of Maize dwarf mosaic virus (MDMV).

  • Largely a South American disease until discovered in North Central Kansas. Has also occurred in South Central Nebraska and Hawaii.

  • MCMV may be vectored by corn rootworm beetles (Diabrotica species) (laboratory research) and/or thrips (Franklinella species) (Hawaiian breeding nursery). Research has also noted a possible soil-borne mechanism for overwintering.

  • The disease has the potential to dramatically affect yield potential.

  • Favored by high temperatures and wet conditions.

Management:

  • Scout for and manage the occurrence of corn rootworm beetles.

  • Crop rotation can greatly reduce the incidence of MCMV.

  • Plant seed products that demonstrate higher levels of tolerance.



Maize chlorotic mottle virus lesions
Maize chlorotic mottle virus lesions, Gothenburg, NE. (9-17-2019)


Identification, Characteristics, and Diagnosis:

  • Symptoms include light-greenish mottling (alternating light- and dark-green areas) of leaves.

  • Symptomology resembles those of Maize dwarf mosaic virus (MDMV).

  • Largely a South American disease until discovered in North Central Kansas. Has also occurred in South Central Nebraska and Hawaii.

  • MCMV may be vectored by corn rootworm beetles (Diabrotica species) (laboratory research) and/or thrips (Franklinella species) (Hawaiian breeding nursery). Research has also noted a possible soil-borne mechanism for overwintering.

  • The disease has the potential to dramatically affect yield potential.

  • Favored by high temperatures and wet conditions.

Management:

  • Scout for and manage the occurrence of corn rootworm beetles.

  • Crop rotation can greatly reduce the incidence of MCMV.

  • Plant seed products that demonstrate higher levels of tolerance.



Maize chlorotic mottle virus lesions
Maize chlorotic mottle virus lesions, Gothenburg, NE. (9-17-2019)


Identification, Characteristics, and Diagnosis:

  • Symptoms include light-greenish mottling (alternating light- and dark-green areas) of leaves).

  • Symptomology resembles those of Maize dwarf mosaic virus (MDMV).

  • Largely a South American disease until discovered in North Central Kansas. Has also occurred in South Central Nebraska and Hawaii.

  • MCMV may be vectored by corn rootworm beetles (Diabrotica species) (laboratory research) and/or thrips (Franklinella species) (Hawaiian breeding nursery). Research has also noted a possible soil-borne mechanism for overwintering.

  • The disease has the potential to dramatically affect yield potential.

  • Favored by high temperatures and wet conditions.

Management:

  • Scout for and manage the occurrence of corn rootworm beetles.

  • Crop rotation can greatly reduce the incidence of MCMV.

  • Plant seed products that demonstrate higher levels of tolerance.





Sources:

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Web sites verified 8/28/19.


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    Refuge seed may not always contain the DroughtGard® trait. Adament™ 50 WG Fungicide is only registered in California. Roundup Technology® includes glyphosate-based herbicide technologies.

    IMPORTANT IRM INFORMATION: Certain products are sold as RIB Complete® corn blend products, and do not require the planting of a structured refuge except in the Cotton-Growing Area where corn earworm is a significant pest. Products sold without refuge in the bag (non-RIB Complete) require the planting of a structured refuge. See the IRM/Grower Guide for additional information. Always read and follow IRM requirements.

    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 products with XtendFlex® Technology.

    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 formulations of dicamba or glyphosate are approved for in-crop use with Roundup Ready 2 Xtend® soybeans. NOT ALL formulations of dicamba, glyphosate or glufosinate are approved for in-crop use with products with XtendFlex® Technology.

    Roundup Ready® Technology contains genes that confer tolerance to glyphosate. Roundup Ready® 2 Technology contains genes that confer tolerance to glyphosate. LibertyLink® Technology contains genes that confer tolerance to glufosinate. Roundup Ready® Flex Technology contains genes that confer tolerance to glyphosate. Roundup Ready technology contains genes that confer tolerance to glyphosate, an active ingredient in Roundup® brand agricultural herbicides. Roundup Ready 2 Xtend® soybeans contain genes that confer tolerance to glyphosate and dicamba. Products with XtendFlex® Technology contains genes that confer tolerance to glyphosate, glufosinate and dicamba. Plants that are not tolerant to glyphosate, dicamba, and/or glufosinate may be damaged or killed if exposed to those herbicides. Contact your seed brand dealer or refer to the Bayer Technology Use Guide for recommended weed control programs.

    Insect control technology provided by Vip3A is utilized under license from Syngenta Crop Protection AG. Movento® MPC Insecticide is only registered for use in Florida, Georgia and Alabama. Aeris®, Balance® Flexx, Baythroid® XL, Corvus®, Degree Xtra®, Harness® Xtra 5.6L Herbicide, Harness® Xtra Herbicide, Huskie® Complete, Leverage® 360, and TriVolt™ are restricted use pesticides. Not all products are registered for use in all states and may be subject to use restrictions. The distribution, sale, or use of an unregistered pesticide is a violation of federal and/or state law and is strictly prohibited. Check with your local dealer or representative for the product registration status in your state. Fortenza Advanced™ is an on-seed application of Fortenza® and Rascendo® seed treatments. Agrisure Viptera®, Fortenza Advanced™, Fortenza® and Rascendo® are trademarks of Syngenta Group Company. Tank mixtures: The applicable labeling for each product must be in the possession of the user at the time of application. Follow applicable use instructions, including application rates, precautions and restrictions of each product used in the tank mixture. Not all tank mix product formulations have been tested for compatibility or performance other than specifically listed by brand name. Always predetermine the compatibility of tank mixtures by mixing small proportional quantities in advance. Degree® is a registered trademark of Monsanto Technology LLC. Channel®, Channel® and the Arrow Design® and Seedsmanship At Work® are registered trademarks of Channel Bio, LLC. Services and products offered by Climate LLC are subject to the customer agreeing to our Terms of Service. Our services provide estimates or recommendations based on models. These do not guarantee results. Consult with your agronomist, commodity broker, or other industry professional before making financial, farming, or risk management decisions. More information at www.climate.com/legal/disclaimer. FieldView™ is a trademark of Climate LLC. Herculex® is a registered trademark of Dow AgroSciences LLC. Clearfield®, Copeo®, ILeVO®, LibertyLink logo® , LibertyLink®, Poncho®, Poncho®/Votivo® and Votivo® are trademarks of BASF Corporation. Respect the Refuge and Corn Design® and Respect the Refuge® are registered trademarks of National Corn Growers Association. Some of the product(s) discussed herein are restricted use pesticide(s) and may not be registered in all states. The distribution, sale, or use of an unregistered pesticide is a violation of federal and/or state law and is strictly prohibited. Check with your local dealer or product representative for the product registration status in your state. Absolute®, Acceleron®, Adament™, Admire®, Aeris®, Aliette®, Alion®, Allegiance®, Asgrow and the A Design®, Asgrow®, Autumn™, Axiom®, Balance®, Bayer, Bayer Cross, Baythroid®, BioRise®, Bollgard II®, Bollgard®, BUTEO™ start, Capreno®, ConnectIN™, Corn States Triangle Design®, Corvus®, Degree Xtra®, DEKALB and Design®, DEKALB®, Delaro®, Deltapine Select™, Deltapine®, DiFlexx®, Disease Shield®, DroughtGard®, DryTough™, Emesto®, Evergol®, EverGol®, FarmFlex®, Finish®, Flint®, Fontanelle Hybrids and Design®, Fontanelle Hybrids®, Gaucho®, Gem®, Ginstar®, Gold Country Seed®, Ground Breakers®, H Hubner and Design™, Harness®, Hubner Seed & Design®, Hubner Seed Your Trustworthy Seed Resource & Design®, Hubner Seed™, Huskie®, Jung Seed Genetics & Design®, Jung Seed Genetics™, Kruger Seeds™, Laudis® , Leaf Triangle Design®, Leverage®, Lewis Hybrids and Design®, Lewis Hybrids™ , Lewis Premium Grains & Design®, Luna Experience®, Luna Privilege®, Luna Sensation®, Luna Tranquility®, Luna® Flex, Luna® Pro Fungicide, Luxxur®, MILK MAXX SILAGE RESEARCH and Design®, Minuet™, Movento®, Movento® HL, Nortron®, Oberon®, Olympus®, Poncho®, Preceon™, Proline®, Propulse®, Prosaro®, Prosper®, Provost®, Raxil®, REA Hybrids and Design™, Rea Hybrids™ , Respect the Refuge and Cotton Design®, RIB Complete and Design®, RIB Complete®, Ricestar®, Rimfire®, Roundup PowerMAX®, Roundup Ready 2 Technology and Design®, Roundup Ready 2 Xtend®, Roundup Ready 2 Yield®, Roundup Ready®, Roundup Technology®, Roundup WeatherMAX and Design®, Roundup WeatherMAX®, Roundup®, RT 3 Powered by Roundup Technology and Design®, RT 3®, Scala®, Serenade®, Serenade® SOIL fungicide, SilageSmart & Design®, SilageSmart®, Sivanto®, SmartStax®, Specialty and Design®, Specialty Hybrids™, SR and Design®, Stance®, Stewart and Design™, Stewart Seeds™, Stone Seed & Design™, Stone Seed™, Stratego®, ThryvOn™, Trecepta®, Trilex®, TripleFLEX®, TriVolt™, TruFlex™, VaporGrip®, Varro®, Velum®, Vistive®, VT Double PRO®, VT Triple PRO®, VT4PRO™, VT4PRO™ , Warrant®, WestBred and Design®, WestBred®, Wolverine®, XtendFlex®, XtendiMax® and YieldGard VT PRO® are trademarks of Bayer Group. All other trademarks are the property of their respective owners. For additional product information call toll-free 1-866-99-BAYER (1-866-992-2937) or visit our website at www.BayerCropScience.us. Bayer CropScience LP, 800 North Lindbergh Boulevard, St. Louis, MO 63167. ©2024 Bayer Group. All rights reserved.

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