Pest Type: Bean Pest
Row: Lepidoptera – Lepidoptera
Family: Scoops – Noctuidae
Distributed everywhere. It damages peas, clover, alfalfa, lupine and other legumes, sugar beets, flax, onions, corn, potatoes, a lot of fields, garden, vegetable crops, as well as weeds.
Butterfly with a wingspan of 36-42 mm; fore wings black-brown with yellowish transverse lines; round and kidney-shaped spots are gray-brown, between them a blackish triangle. 0.75 mm egg, light yellow.
The caterpillar is 29-43 mm long, green with a black velvet back, two yellow spine-like stripes. Pupa-18-19 mm, dark brown. A pupa hibernates in a cocoon in the soil. Butterfly release begins in May. The departure period is long and is observed until mid-September.
Additionally, feed on flowering plants. The female lays eggs on the underside of the leaves in regular rows in one layer, in groups of 50 to 400 pieces in each clutch. After 8-10 days, caterpillars revive, which damages the leaves within a month. First-generation caterpillars complete development in July and migrate to pupation soil. Butterflies of the second generation fly in August-September. In the same months, the development of second-generation caterpillars occurs, which subsequently form a cocoon in the soil, pupate and remain in it until spring. Two generations are developing over the year.
Peas can be damaged: Agrotiscorticea Schiff., Which hibernates in the caterpillar stage of the II-IV centuries and develops in one generation; DiscestradianthiTausch-winters in the pupal or caterpillar stages of the last age and can produce 2-3 generations per year.
The number of scoops is reduced by some parasites. The eggs are infected with a Trichogramma. Several dozens of horsemen and mukhtahin parasitize on the tracks. Often there are braconids, chalcid, eulogies, tahini.
Protective measures. The number of pests is reduced by such agrotechnical measures as autumn plowing, cultivation, and destruction of weeds. Twice issue of Trichogramma against each generation at the beginning of the departure of butterflies and laying of eggs – 40-50 thousand per 1 ha. At the beginning of the revival of caterpillars, the use of biological products. Against caterpillars when exceeding the economic threshold of harmfulness, spraying with insecticides.