Arthropod Diagnostic Guide

Select crop type first:

Beet Armyworm

Alfalfa

Beet armyworm caterpillar: variable color from green to black with a yellow running stripe on either side.

Billbug

Corn

Adult billbug: All black body with prominent snout off the front of the head, about a 1/2" long in length.

Bird cherry-oat aphid

Wheat

Bird cherry oat aphid: Black, or dark colored

Black Cutworm

Corn

Black cutworm: color variation from brown to grey with bumpy skin, often found buried within the soil surface.

Black Grass Bug

Wheat

Black Grass Bug

Blister Beetles

Soybean

Grey blister beetles

Blue Alfalfa Aphid

Alfalfa

Blue alfalfa apid on a plant

Blue Alfalfa Aphid

Alfalfa

Blue alfalfa apid on a plant

Bollworm

Cotton

Bollworm on cotton

Brown stink bug

Soybean

Brown stink bug adult