2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
The yellow gooseberry sawfly is a big fan of not only juicy gooseberries, but also growing currants. This pest is dangerous in that, depending on the distribution area, it is capable of producing several generations per season. If in the northern regions it gives only one generation, then in the southern regions it often manages to develop up to five generations per year. Most of all, the larvae of pests harm the berry plantings - gluttonous false caterpillars. As a result of their active life, plants often die, and the berry yield is noticeably reduced
Meet the pest
The yellow gooseberry sawfly is a harmful insect endowed with transparent wings and a black head. The size of adults ranges from 6 to 8 mm. All sawflies are endowed with bristle-shaped nine-segmented antennae and yellow legs decorated with dark marks. In females, three black spots can be seen on the pronotum: two miniature oblong ones on the sides and one large in the middle. And in males, there are no such specks - their pronotum is characterized by a monochromatic brownish color. The wingspan of their wings is in the range from 10 to 12 mm, while the wingspan of females ranges from 15 to 16 mm.
Milky-white eggs of harmful parasites have an oblong shape. Adult larvae, called larvae, grow up to 17 mm in length, are endowed with twenty legs and are painted in grayish-greenish tones. And the first and eleventh segments of their bodies are usually yellowish.
Overwintering of late-instar larvae takes place in the soil in parchment-like and rather dense cocoons. As a rule, all cocoons are located at a depth of up to five centimeters - in these houses, pests pupate in the spring. And a couple of weeks after pupation, at the budding stage, adult sawflies emerge.
Female pests lay eggs on the undersides of the leaves, placing them exclusively along the veins in small chains and having previously made small cuts in the leaves with the help of ovipositor. Subsequently, harmful larvae emerge from these eggs. By the way, yellow gooseberry sawflies reproduce not only sexually, but also parthenogenetically. Individuals of younger ages live in huge colonies, first skeletonizing the leaves, and then eating holes in the leaves. And older pests eat up the leaves completely, as a result of which only miserable pieces in the form of veins remain of them.
The development of voracious larvae takes fifteen to twenty-eight days. After this time, they pupate in the soil, and after a couple of weeks, pests of the next, second generation, are selected. By the way, the second generation is considered the most voracious and numerous. Its development falls on the second half of June - during this period, active sawflies, in addition to leaves, are also capable of destroying berries. And when the larvae of the second generation complete their feeding, they immediately go to winter in the soil.
How to fight
The most important preventive measure against overly active yellow gooseberry sawflies is a thorough digging of the soil in the fall. It contributes to the destruction of the wintering grounds of harmful parasites and, accordingly, to the limitation of their reproduction.
Immediately, as soon as evil larvae appear on the gooseberry bushes, berry plantings are started to be treated with Kinmiks, Aktellik, Kemifos or Karbofos. Quite good help in the fight against gluttonous parasites and drugs such as "Fufanon", "Karbofot" and "Iskra".
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