2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
The raspberry (raspberry) kidney moth is a big fan of raspberries. True, sometimes it can damage blackberries. Mainly shoots and buds of predominantly early raspberry varieties suffer from the attacks of this pest. From damaged buds, you can no longer wait for shoots with peduncles, respectively, there will be no berries. And since the vigorous activity of the raspberry kidney moth directly affects the volume of the crop, it is extremely important to find it on the site in time and start fighting it in a timely manner
Meet the pest
The raspberry kidney moth is a harmful butterfly with a wingspan of 11 to 14 mm. Its front black-brownish wings are equipped with four yellowish-golden spots along the edges. And this pretty guy has only two such spots on the gray hind wings, but they have a rather interesting fringe on them.
The eggs of the raspberry kidney moth are yellowish-white, 0.2-0.3 mm in size. And the length of caterpillars of the last age ranges from eight to eleven millimeters. These little red creatures are endowed with black heads, as well as anal and chest plates of the same color. As for the pupae, their length is from 8 to 9 mm, and they are colored in brownish shades.
The wintering of caterpillars of the first and second centuries takes place in dense white cocoons in stumps of cut crimson bushes, cracks in the bark, the lower parts of the shoots, as well as in plant debris. As soon as the buds begin to bloom, the overwintered harmful caterpillars, having climbed up the stalks, instantly bite into them, sealing the entrance holes with excrement and cobwebs. Then they begin to eat away the contents of the buds, and after such a meal they move into the shoots, in which they quickly gnaw out the middle. Subsequently, these parasites pupate in the cores of the shoots or in the damaged buds. As a rule, they pupate in the second half of May. And the departure of butterflies usually coincides with the start of the flowering of raspberry bushes. Butterflies fly mainly during the day and also before sunset in the evenings. The females lay eggs one at a time at the bases of the flower stamens. Their total fertility reaches 60 - 90 eggs.
After a week and a half, voracious caterpillars revive from the eggs, feeding on flower fruit for ten to twelve days. And immediately before the ripening of the fragrant berries, they go to wintering places before the onset of spring. Usually, only one generation of raspberry kidney moth has time to develop per year.
How to fight
The raspberry kidney moth has natural enemies - along with caterpillars, pupae infect some riders from the Eulophid, Braconid and Chalcid families. Help in reducing the population of these berry enemies and tahina flies.
When pruning raspberry bushes, they should be removed under the very root so that there are no stumps left that serve as fertile soil for the development of pests, because the larvae of the raspberry kidney moth winter with great pleasure. In addition, it is very useful to periodically rejuvenate berry bushes, since young shoots are much less likely to get sick and are attacked by a much smaller number of pests.
Collected plant residues must be burned. You should also collect wilted buds along with parasite caterpillars and immediately destroy them. Of course, such a measure will be advisable if the raspberry plantings are not too large.
If, at the beginning of the emergence of overwintered harmful caterpillars (at the stage of expansion of the kidney scales), there will be four to five individuals or more for each raspberry bush, then the raspberries are treated with insecticides. Spraying with tsvetophos and karbofos helps a lot - they treat the soil and the base of the bushes at the stage of bud swelling.
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