Pest Type: Pest of Strawberry and Raspberry
Row: Hymenoptera – Hymenoptera
Family: true sawflies – Tenthredinidae
It is found everywhere. Damages raspberries, blackberries, mountain ash.
The adult is 5–7 mm long, black, covered with sparse hairs, wings are dark, hind legs in the apical part are white, the last segment of the abdomen is somewhat elongated, covering the top of the ovipositor from above. Egg size 1-1.2 mm, white. Larva 10-12 mm long, body dark brown or white on top, head black or brown. Pupa – 8-9 mm, light yellow.
Eonymphs winter in a thin two-layer light brown cocoon in plant debris, sometimes in the soil at a depth of 5-7 cm. Pupate in April. Years of adults of the first generation begin at an average daily air temperature of 11-12 ° C and coincides with the phenophases of raspberry buds blooming. The female lays eggs one at a time in the leaf petioles, less often in the main veins. The laid eggs are clearly visible in small brown incisions. Fertility – 40-50 eggs. Larvae, resurrected after 5-7 days, are kept on the lower surface of the leaf. First, they skeletonize the leaf in the form of windows, then gnaw holes or gnaw the leaf from the edges. After 22-25 days, the larvae complete their feeding and pupate in cocoons. The development of the pupa is completed in 10-15 days, and the second generation takes place, which also develops on raspberry leaves. Two generations are developing over the year. In the southern regions, there is a third.
Predators and parasites play an important role in regulating the sawfly population.
Protective measures. Tillage between rows and under bushes. Destruction of plant debris. With the number of more than 10-12 false caterpillars per 100 sheets – the use of biological products or insecticides at the beginning of the revival of false caterpillars.