The Small Grains Field Guide

Section IV: Photographs

Small Grains Insects

Aphids in grain head.	Armyworm larvae.
Bird-oat cherry aphids, mothers and daughters.	Damage from barley thrips.
Barley thrip adult greatly enlarged; cigarshaped with feathery wings.	Wheat infected with barley yellow dwarf. Note discoloration and stunting.
Wheat infected with barley yellow dwarf. Note localized patches of plants with yellow flag leaves.	Cutworm larvae. Note “C” shape. Larvae curl when disturbed.
Hessian fly adult.	Hessian fly larvae inside stem. Larval feeding can result in lodging.
Grasshopper damage typically first seen at the edge of fields.	Orange Wheat Blossom Midge larvae (left) and adult (right).
Ladybug larvae (larger inset in photo). One of the most important natural aphid controls. Ladybug pupae; adults will emerge from these immodle forms. Note larva on right is almost ready to pupate. Ladybug adult; found in large numbers after heading.
Tiny parasitic wasp; another important control of aphids. Female wasps lay their eggs in aphids and the hatching larvae eat the aphid from the inside. They only attack/sting other insects.	A parasitized aphid, called a “mumy.” Note the hole in the aphid’s abdomen. This is where the parasitic wasp exited after it finished devloping.
Exit hole of a stalk borer.	Stalk borer caterpillar still in wheat stem.

 

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