Aspergillis Ear Rot
Symptoms
- Patches of green to yellow spores on or between kernels
- Most common at tip of ear and scattered on a few kernels on ear
- The fungus can become dark green to brown as it ages
- Aspergillus flavus and other Aspergillus can also cause storage rot. In favorable conditions, Aspergillus can invade kernels with moisture levels as low as 14%. Kernels are more likely to be invaded by fungi if they have come from rotted ears or if they have been damaged.
Pathogen Involved
- Aspergillis flavus
- This fungus produces aflatoxin, a dangerous mycotoxin
- Overwinters in plant debris and soil
- Spread by insects or wind
Time of Occurrence
- Mid to late in the season
- Conditions Favoring Disease
- Hot and dry weather
- Insect damage to ears
- Stressed corn plants
Disease Management
- Reduce plant stress
- Irrigation or tillage may be of some benefit
- Some hybrids may develop less susceptible than others
- Insect control may be helpful
- Planting may timed to reduce stress after pollination