Greenbug (Schizaphis graminum) – pest management
The greenbug or wheat aphid, Schizaphis graminum, is a very widespread insect in the world. This pest causes significant damage to cereal crops.
Description. The aptery forms of greenbug have an oval body, 1.5-2 mm long, light green or yellow. The winged forms have a body of 1.2-1.9 mm in length, with a brown head, brown thorax, and a green abdomen.
Biology and ecology. The wheat aphid is a species that overwinters in the egg stage, laid by females in autumn, on wheat, barley grass, sorghum, corn, or other spontaneous grasses. A female can lay from 1 to 6 eggs. In some countries, the species produces 21-23 generations per year.
Damage. This pest attacks cultivated grasses, especially wheat and barley on which they develop numerous colonies on the leaves. It also attacks spontaneous grass species.
Following the attack, the leaves twist. In the stung areas, reddish spots appear initially, which then merge, gradually covering the entire leaf. Finally, the plant dries out.
Pest management. To control the wheat aphid, treatments with specific insecticides must be carried out.
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