Crop & Pest Report


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Mystery Insect (07/23/20)

What is wrong with these armyworms on wheat heads?

What is wrong with these armyworms on wheat heads?

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Answer:  These photographs depict two forms of ‘biological control in action’ in the wheat field. The left photograph is a fungal-infected armyworm. The right photograph is a braconid wasp cocoons after parasitizing the larva of armyworm. Braconid wasps are ectoparasitic, meaning the cocoons are located outside the body of its host. The armyworm larva quits feeding as soon as it is parasitized by the wasp. These braconids usually kill the armyworm larva. Cool!


Janet J. Knodel

Extension Entomologist

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