Pest Type: Cereal Pest
Row: Coleoptera – Coleoptera
Family: Banded – Scarabaeidae
The greatest harm is done to the southern forest-steppe and steppes of Russia. The beetle eats cereal grains during milk ripeness and knocks hard grains to the ground. It especially damages wheat, rye, barley, feeds on wild cereal grains. Larvae damage the roots of rye, wheat, corn, beets, sunflowers, potatoes, tobacco, fruit seedlings in nurseries.
The beetle is 12.8 – 16 mm long, the body is bluish-blue with a metallic luster; head and shield with a green shine; has antennae; elytra dark chestnut with a black square spot at the scutellum.
Larva up to 35 mm in size, White, with a brown-yellow head, antennae, and legs.
The bugs’ years last from the end of May to the beginning of August, but in some years these periods can fluctuate within two weeks of massive years – from June 11 to July 17. Beetles are active on hot sunny days, they fly, sit on ears and eat. Two weeks after the release, the laying of eggs begins, for which the female digs into the ground to a depth of 10 – 15 cm and lays eggs in small heaps, 2 to 3 doses of 30 to 40 pieces. Three weeks later, larvae emerge from the eggs, they feed on hummus and small roots of various plants, including cultivated ones, older larvae – mainly roots.
Wintering: in the fall they go into the soil to a depth of 30 – 80 cm, and in the spring they rise again to the surface. During the summer, molt twice.
Pupation takes place in soil soils at a depth of 10 – 15 cm. About two weeks are in the pupal stage, after which adults come out. In connection with the two-year development cycle, the summer years are observed in a year. The number of beetle bugs is reduced by nematodes, fungal and bacterial diseases, on the larvae tahina parasitizes.
Protective measures. Inter-row tillage of cultivated crops and steam fields by 10 – 12 cm (late May-early June) to destroy larvae and pupae. Processing of edge bands of cereal crops during the period of grain filling with insecticides in the presence of 3 – 5 beetles per 1 m 2.