Fusarium Head Blight Risk Tool
Low risk as of 4/20/26. To see commentary from Extension Pathologists, click on the megaphone picture in the top right corner.
April 16
General notes: Cereal leaf beetle eggs are present and larvae are hatching. Eggs are also present; these can be parasitized so the threshold is primarily based on the presence of larvae. From University of Delaware
“The treatment threshold is 25 eggs and/or larvae per 100 tillers. Treatment is suggested when the egg threshold is reached and more than 50% of the sample consists of larvae, i.e. 50% egg hatch.” Penn State’s Agronomy Guide has a threshold of one larva per stem at boot stage.
Laytonsville
Growth stage: Feekes 6
Insect pests present: cereal leaf beetle (low)
Beneficial insects present: spiders and lady beetles
Poolesville
Growth stage: Feekes 6
Insect pests present: cereal leaf beetles (moderate; about 10% of stems had 1 larva or eggs)
Beneficial insects present: spiders
April 9
General notes: Scout to confirm weed control after herbicide application. Winter annuals (e.g. henbit, deadnettle, chickweed) and roughstalk bluegrass are flowering. Insects to watch out for at this time of year are cereal leaf beetles and aphids.
Laytonsville
Growth stage: Feekes 5
Insect pests present: aphids (very low)
Beneficial insects present: spiders, lady beetles
Poolesville - Field 1
Growth stage: Feekes 5-6
Insect pests present: cereal leaf beetle adults (low)
Beneficial insects present: spiders, lady beetles
Poolesville - Field 2
Growth stage: Feekes 5
Insect pests present: cereal leaf beetle adults (low)
Beneficial insects present: spiders, lady beetles