Pest Type: Fruit Pest
Row: Equine – Homoptera
Family: aphids – Aphididae
It is found everywhere. Damages the pear.
Female 2.6 mm wide, oval, dark brown; head, prothorax, antennae, tubes, and legs black. Wing parthenogenetic female 2.4 mm in size, head and chest black, shiny; the abdomen is dark brown with a black spot in the middle of the fourth to sixth tergites, antennae with 6 segments. The female stereoscope is 2.2 mm, the belly is brown-brown with black transverse stripes on the tergite. Amphigone female 1.4 mm long, oval, brown-brown; antennae with 5 segments, bright; brown tubes with a black top; brown tail. Male – 1.2 mm, abdominal body flat, narrowed to the apex. An egg 0.4-0.5 mm in size, first light yellow, after 3-4 days – black, shiny.
Fertilized eggs hibernate in cracks in the bark. Larvae regenerate at the beginning of budding. After 25-30 days, the larvae turn into parthenogenetic self-descendants, which in 13-15 days of life revive 50-80 larvae. Having completed development, the larvae turn into winged migrants, which fly to a parsnip or hogweed, where they additionally feed. The offspring of migrants – wingless parthenogenetic females – live in large colonies on the root neck and indigenous secondary hosts. In August-September, winged and wingless statenoscopes appear on parsnips or cow parsnip. The winged statenoscopes migrate to the pear, where 10-23 larvae regenerate, which, having completed development, turn into amphibole females. The wingless statenoscopes on secondary hosts revive the larvae, which eventually turn into winged males.
Damaged as a result of feeding aphids, leaves along the central vein with the lower surface inward, forming a semblance of a gala in which larvae live and feed. Leaves turn yellow or reddish. When feeding the larvae of the amphibole generation, rust spots form on the leaves. In the steppe regions, several types of aphids with a dioecious developmental cycle can also cause significant damage to pears: green pear umbrella aphid, pear cereal aphid.
Measures to protect fruit trees from aphids. Cutting of root shoots and fatty shoots, especially intensively populated by aphids. With a population of more than 10-20 eggs per 10 cm of shoots, it is necessary for the pest breeding centers in early spring, before buds open, at a temperature not lower than +4 ° С, spraying – washing of suicidal trees. If the population density of aphids exceeds 5 colonies per 100 sheets, insecticide treatment is required. The regulated ratio of aphids and aphidophagous is one aphidophagous per 30 pest larvae. With this ratio, the use of affidavits is impractical.