2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Strawberry black-spotted sawfly is found in all regions of our country and damages not only strawberries, but also rose with rose hips, strawberries and, a little less often, raspberries. The larvae of these parasites are considered especially harmful: young larvae actively skeletonize juicy leaves from the lower sides, middle-aged individuals gnaw numerous holes in the leaves, and the larvae of the latter age, in addition to everything, gnaw strawberry leaves along the edges. At the same time, young leaves are eaten by pests entirely. For a year on the territory of Russia, two or three generations of these strawberry enemies manage to develop
Meet the pest
The size of the imago of black-spotted strawberry sawflies is from 7 to 10 mm. The body of the pests is shiny and painted black. By the way, the lids on the breasts of females can sometimes be white. The legs with thighs of the gluttonous parasites are red, and the legs are black.
The larvae of strawberry black-spotted sawflies grow up to 15 mm in length. Each individual is characterized by a green color, and the heads of the larvae are painted in yellowish-brown tones and are endowed with small brownish specks at the top. As for the abdominal legs, there are as many as eight pairs of them in the larvae. Initially, pale pupae turn black in color just before the emergence of the imago. And they are located in thin-walled two-layer cocoons of dark brown color.
Wintering of pests takes place inside the stalks in cocoons. They often overwinter in the surface soil layer, as well as in fallen leaves. Enemies of strawberries pupate approximately in April. The emergence of adults coincides with the stage of separation of peduncles and with the start of flowering of early strawberry varieties. Their additional food is flower nectar and pollen of umbrella crops.
Strawberry black-spotted sawflies usually lay eggs one at a time, placing them in leaf parenchyma near thick veins, making numerous cuts in them with the help of ovipositor. By the way, it will not be difficult to notice such places - characteristic swellings appear on them. The total fertility of females reaches from sixty to eighty eggs.
The duration of the subsequent embryonic development of harmful parasites is from eight to fifteen days. The revival of gluttonous larvae occurs on the eve of the massive flowering of strawberry bushes. If disturbed, they curl up into rings and fall to the ground. In general, the development of larvae takes twenty to twenty-five days. At the end of this period, the individuals who left the forage vegetation make their way into the cores of cut or broken weeds, which are distinguished by rather thick stalks, and some of them pass into the shoots of roses and raspberries, where the pests make moves from ten to twelve centimeters long. As a rule, such passages end with oval chambers in which strawberry black-spotted sawflies pupate. And after two weeks, the appearance of the second generation imago can be observed.
The larvae of the last generation remain hibernating in cracks in the bark, inside the stalks of herbaceous plants, as well as in the soil and fallen leaves.
How to fight
Weed vegetation seen on strawberry plantings should be systematically destroyed. Destroy it in the adjacent areas. And the soil in the aisles is well dug up.
If for every hundred leaves there are ten to twelve false caterpillars, and thus harmful parasites colonize from fifteen to twenty percent of the plants, during the revival of the larvae, they begin to carry out treatments with biological products or insecticides. And if the number of enemies of strawberries is especially large, after the fragrant berries are collected, they are re-processed. Especially well suited for such treatments "Metaphos", "Karbofos" and "Entobacterin".
Not the last role in regulating the number of black-spotted strawberry sawflies is assigned to their natural enemies - tahin flies and horsemen.
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