Pest Type: Fruit Pest
Row: Equine – Homoptera
Family: scale insects – Diaspididae
It is found everywhere. It damages all fruit, berry, various deciduous, sometimes herbal plants. Prefers apple trees and poplars.
The female is 1.1-1.5 mm in size, white with a yellowish tint, without legs, antennae, and eyes, the shield is brown, expands to the posterior end, oblong, curved in the form of a comma; the shield consists of two larval skins protruding beyond the contour of the head end of the shield, the length of the shield is 3-3.5 mm The male is 0.5 mm in size, black-gray, with a slender, oblong body, has one pair of wings, three pairs of legs and antennae, a long bristle process on the end of the abdomen; male shield — 1.5–2 mm; similar in shape and color to female shield. Egg – 0.3 mm, oval, white, shiny. Larva (wander) 0.3 mm in size, flat, oval, with three pairs of legs, antennae, and red eyes, pale yellow, with a pair of bristles at the end of the abdomen.
Eggs hibernate under the shields of females on the bark of trunks and branches. Eggs are not resistant to frost and die at a temperature of -32 … -35 ° C. Revival and the emergence of larvae begin in late April – early May at temperatures above 8 ° C and lasts 8-14 days. Larvae creep along the tree and after 2-3 days they attach to the bark of trunks and branches, less often – to the leaves and ovary. Immediately covered with white waxy threads, intertwined.
After 15-20 days, the larvae of the first age molt, while losing their eyes, antennae, and legs. The scutellum consists of secretory secretions and crusts after molting. 25-30 days after the second molt, the larvae turn into females. For 20-30 days, females continue to eat, the size of their body and scutellum increases 2-2.5 times. The body of the female occupies the entire space under the flap. Having reached puberty, females lay 70-100 eggs during August-September. As the eggs are laid, the female body contracts and at the end occupies only the front narrow part of the scutellum. Having completed the egg-laying, the females die. Due to the fact that males are rare, most females lay unfertilized eggs. One generation per year is developing. More often the pest is found in cells. In the case of mass reproduction, significant areas of the cortex are covered with shields.
Larvae feed on goldfish, predatory bugs, muhisirfidy, ground beetles, predatory mites, spiders, etc. More than 30 species of riders from the chalcid family and others parasitizing on the insect shield are able to reduce the number of pests to 80% or more.
Protective measures. If there are more than five scutes per 10 cm of branches or during the growing season five larvae per 1 cm of thick branches – spray the trees in the pest foci with insecticides 2-4 days after the flowering of the apple tree. More precisely, the processing time is determined by determining the beginning of the exit of the larvae from under the scutes.