Tar spot, gall midge making summer debuts
Mid-July is bringing the emergence of yield-robbing corn and soybean diseases and pests that Iowa farmers should be on the lookout for, experts from Iowa State University said last week.
Tar spot, a leaf disease caused by a fungus, has been confirmed in 12 Iowa counties in central and eastern Iowa. It’s recognizable by its small, slightly-raised, round-to-irregular-shaped black spots scattered across the leaf surface.
“It stops the plant from photosynthesizing efficiently, so ...
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