Pest Type: Currant and Gooseberry Pests
Row: Coleoptera – Coleoptera
Family: Goldilocks – Buprestidae
It is found everywhere. It damages gooseberries, black and red currants.
Beetle 6-9 mm long, golden-copper in color with a green tint and metallic sheen; the body is narrow, oblong; elytra in the upper third arcuate narrowed and rounded at the ends. The eggs are rounded, up to 1 mm in diameter, covered with a hard shield, first yellow-orange, then gray-brown. Larva 18-20 mm long, without legs, yellow-white, with distinct segments of the body, flattened somewhat, two short chitinous hook-shaped processes on the end of the body. Pupa – up to 8 mm, white with a slight yellowish tinge.
Larvae of different ages overwinter inside damaged shoots, mainly in their lower part. In years with warm summers in the forest-steppe, most of the larvae reach the wintering time of the last, fourth age. In spring, feeding of larvae begins at an average daily temperature above 8 ° C. Pupation of larvae occurs inside the damaged shoots at the end of April-May.
Due to the age composition of the population, the pupation period is extended and lasts more than 1.5 months. Mass pupation coincides with the beginning of the formation of the ovary of currant. The development of the pupa lasts 20-28 days.
Formed beetles gnaw through the flight hole and go outside. The beetles’ years occur from mid-May to the end of summer. They additionally feed on leaves for 8-14 days.
Beetles are active in sunny weather. In the morning, evening hours and in cloudy weather, their activity decreases and they are located inside the crown of bushes. Female eggs are often laid one at a time, mainly on two to three-year-old shoots. The egg is covered with mucous secretions from above, quickly solidify and form an oval shield. Fertility – 30-40 eggs. Embryonic development lasts from 15 to 30 days. The passages are densely clogged with fine drill flour, which differs from the passages of the caterpillars with current glass. Damaged shoots lag behind in growth, in spring the leaves bloom on them slowly or do not bloom at all, first the tip dies, and then the entire shoot dries out. By the fall, 60 days after the revival, the larva gnaws at a 20-40 cm long passage. In these processions, larvae of different ages winter. One generation is developing in a year.
Unfavorable conditions for the development of goldfish are low temperatures in winter in the absence of snow cover and cool weather with heavy rains during the mass summer of beetles and laying eggs. In larvae, chalcid, braconids, ichneumonids, tahini flies parasitize.
Protective measures. Cutting under the root and burning damaged shoots in autumn and spring. The economic threshold for harmfulness is 3% of damaged shoots in young plantings, 5% in old plantings, 2-3 beetles per bush. At the beginning of the mass summer of beetles, it is observed when the sum of effective temperatures of 330 ° C is reached (at a threshold of 8 ° C), 10-15 days after flowering – treatment of plantings with insecticides. A second treatment may be carried out after the harvest of the berries.