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Eyespot (Aureobasidium zeae)

Eyespot on corn leaves

Eyespot: biology

Eyespot is a foliar corn disease. The fungus overwinters in residue, making it more prevalent under continuous corn and reduced tillage systems. Disease development is favoured by cool, wet conditions. Infection can occur throughout the growing season, generally infecting the oldest, lower leaves first and progressing up the plant. Damage from eyespot usually looks worse than it actually is, though yield loss is possible if the disease reaches the upper leaves of the plant.

Eyespot: Damage description

Eyespot produces characteristic round or oval lesions (3 mm to 6 mm in diameter) that initially appear water-soaked; later the centre turns tan surrounded by a brown or purple border. A translucent yellow halo is also visible when held up to the sun. Leaf blighting may occur when these lesions join, killing large portions of leaf tissue. Infections occur on leaves, leaf sheaths and husks. The disease can be confused with non-infectious physiological leaf spots or insect damage.

Eyespot: Management

Some corn hybrids can offer a good level of resistance. Additionally, crop rotation and removal of corn residue will help to reduce early infections. Though treatment is rarely warranted for eyespot in corn, seed production fields benefit from a foliar fungicide application when conditions for eyespot are favourable and infection occurs prior to silking.

Source
http://www.omafra.gov.on.ca/english/crops/pub811/pub811ch16.pdf

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