2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
The yellow blackcurrant sawfly lives in the forest-steppe and woodlands and mainly damages the black currant. Adults of this pest resemble the yellow red currant sawfly. A distinctive feature of the enemies of black currant is their incredibly fast development. Sometimes yellow blackcurrant sawflies are capable of damaging gooseberries with red currants. Having found these uninvited guests on the site, you must immediately begin to fight them
Meet the pest
The adults of yellow blackcurrant sawflies reach a length of 6 - 7 mm. Their breasts and heads are blackish, the abdomens are yellow-orange, the wings of the lids and pronotum are yellowish, and the legs are painted in rather interesting reddish-yellow tones.
The eggs of these enemies of the currant are shiny and milky white, their size is about 1 mm. Herbaceous green larvae up to 5 mm long are endowed with seven pairs of legs on the abdomens and yellowish-brownish heads. And the size of dense light brown cocoons is 6 - 7 mm.
The larvae of this pest hibernate in the soil in cocoons at a depth of five to seven centimeters. In early May, the parasites pupate, and after eight or twelve days the adults are already flying out. The population of yellow blackcurrant sawflies is characterized by the predominance of females - on average, there are eight to eleven females for each male. Most often, without any additional nutrition, and sometimes after an extremely short feeding, the female, whose total fertility is in the range of 60 - 90 eggs, begins to lay eggs on the flowers of umbrella plants. As a rule, pests place them along the lateral and main veins on the undersides of the leaves.
The duration of the embryonic development of parasites is approximately six to eight days. The reborn, fairly hungry larvae gnaw out numerous holes in the juicy leaves of black currant, and the grown-up individuals eat the tissue of the leaves up to the main veins. Basically, these parasites colonize the lower tiers of currant bushes. The development of the larvae is kept within two weeks, and then they are sent to the soil for pupation. The full development of one generation takes about 25 - 32 days - the temperature regime has a significant effect on this process. During the year, three generations of these harmful gourmands almost always develop, and sometimes an optional fourth generation can develop.
How to fight
Trichograms, ground beetles and predatory bugs help to significantly reduce the population of yellow currant sawfly. And the false caterpillars, in addition to tahin flies, are infected by riders from the Braconid and Ichneumonid families.
In summer and autumn, soil cultivation should be carried out not only under berry bushes, but also in the aisles.
At the stage of black currant budding, it is recommended to spray the bushes with Aktellik or tobacco infusion. It is also allowed to use "Karbofos" and "Anometrin". A good effect can be achieved using various biological products: "Lepidocide" (it is better to take it in concentrated form) or "Bitoxibacillin".
You can also destroy the larvae mechanically - shake them off the bushes onto the previously spread bedding. The parasites collected in this way must be promptly destroyed.
If the pest is inhabited by about 15 - 20% of the bushes, or there are ten to twelve false caterpillars for every hundred leaves, then at the stage of larval revival, they begin to treat them with biological products or insecticides. If there are especially a lot of gluttonous parasites, then, having harvested the berries, you can also re-treat with insecticides or various biological products.
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