2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
The bluehead scoop, which lives almost everywhere, damages apricots with apple trees, plums with pears, peaches, as well as cherries and cherries quite badly. And this spectacular pest is not indifferent to hawthorn, thorns, mountain ash with almonds, bird cherry, as well as hazel, willow, poplar and oak. She especially loves the buds and leaves of various fruit trees, therefore, in order to preserve the harvest, this villain must be fought with
Meet the pest
The bluehead scoop is a very interesting butterfly with wingspan ranging from 30 to 45 mm. The front wings of the pests, painted in gray tones, are characterized by a pronounced purple tint and endowed with contiguous reniform rounded specks, merging into a single spot of light yellow color. Also on the front wings of the pests, you can see jagged transverse lines of dark brown color. The hind wings of the bluehead scoop are also grayish, with darkened rear corners.
The size of the white rounded eggs of these spectacular pests is about 0.4 mm. And caterpillars grow in length up to 28 - 34 mm. Their chairs are white, the lateral and dorsal lines are yellow, and the spiracles, bristles on the body and warts are black. Numerous secondary setae are located on the outer sides of their abdominal legs, located in the segment from the third to the sixth segments. Pupae, growing up to 17 mm, are colored in dark brown tones with a pleasant bluish tint and are endowed with wide two-lobed cremasters, equipped with four pointed bristles on each lobe.
Pest eggs overwinter on the bark of tree trunks and branches. In April, the revival of caterpillars begins, first feeding on blossoming buds, and then on leaves - from the latter, as a result of the destructive activity of these parasites, only petioles and median veins remain. In addition, caterpillars often damage the ovaries - voracious scoundrels gnaw deep enough holes in them. Caterpillar feeding continues for thirty-five to forty days, and during this time they all manage to pass as many as five instars.
With the onset of June, caterpillars that have completed their development make very dense cocoons from leaves, pieces of bark and strong silky threads, in which they will subsequently pupate. Both the formation of cocoons and the pupation itself usually take place in buildings, in the midst of debris in near-trunk circles, in cracks in the bark and in other equally reliable shelters.
Closer to autumn, pupae enter diapause for some time, and in September and October, butterflies emerge. Females lay eggs, placing them in groups of two to three to forty pieces in each on the bark of trunks and branches. In addition, pests cover each clutch with tiny scales and numerous hairs from their own abdomens. All eggs laid by butterflies overwinter. During the year, only one generation of the bluehead scoop develops.
How to fight
During the period of diapause of the bluehead scoop, it is necessary to thoroughly cultivate the soil in the near-trunk circles. Do not forget about the aisles. And trees must be systematically cleaned of old bark.
In the event that more than two pest eggs are found on each square meter of branches, it will not hurt to carry out early spring processing of fruiting crops. And if, in addition to everything, about 20 - 25% of the leaves are damaged, it is advisable to switch to the treatment of fruit crops with biological products or insecticides. Organophosphate insecticides have proven themselves especially good in the fight against blue-headed scoop.
During the period of vigorous activity of the caterpillars, they are shaken off the trees and immediately destroyed. And in the destruction of butterflies, light traps are great help.
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