2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Currant kidney moth mainly affects white and red currants. Black currant suffers from its attacks a little less often. And this garden enemy lives almost everywhere. Damage to the buds of the currant bud moth significantly retards the development of plants. Currant bushes are weakening, their resistance to negative temperatures is significantly reduced, the commercial quality of berries is greatly deteriorating, and sometimes you have to say goodbye to the harvest
Meet the pest
The currant kidney moth is a pretty cute butterfly. Its wingspan reaches from 13 to 16 mm. The front wings of the pest are yellowish-brown with a pleasant purple tint. Each of them is decorated with three bright spots. And the hind wings of the currant kidney moth are equipped with a long fancy fringe and have a grayish-brown color.
The white eggs of these garden enemies reach 1 - 1, 2 mm in size. Caterpillars of the first instar are colored in reddish tones, middle instars - in yellowish-brownish, and the parasites that have completed their development have dirty greenish tints. The length of harmful caterpillars reaches from 9 to 12 mm. They are endowed with shiny black chest plates and heads, and their anal plates are painted in rusty-gray tones. All over the caterpillar's body, you can see tiny warts with fairly light hairs. And the size of light brownish pupae ranges from 8 to 10 mm.
Wintering of harmful caterpillars that have reached the first instar takes place in white dense cocoons at the bases of stumps and old shoots, under peeled bark. At the end of the first molt, they rise to the upper branches noticeably heating up in the daytime. The duration of the release of parasites is from five to eight days, and in time this process coincides with the period of expansion of small renal scales. Voracious caterpillars feed on kidneys, biting into their centers. They molt three times inside the very first damaged buds, and then begin to move to neighboring ones. During the period of its development, each caterpillar is capable of damaging from four to seven buds. Buds attacked by currant kidney moths, as a rule, dry up before they bloom, and only occasionally they can give rather ugly leaves.
With the onset of the end of April or the beginning of May, when the tender buds begin to move, the caterpillars begin to pupate at the very beginning of flowering. This happens mainly at the bases of currant bushes, a little less often - inside vulnerable buds. Ten to twelve days later, the emergence of butterflies is noted, laying one egg with the help of ovipositor inside the green berries. The total fertility of female pests is approximately fifty to sixty eggs. The voracious caterpillars revived after six to eight days feed on seeds inside tiny berries for several days, and then, having had enough, move to wintering places. Generation in the currant kidney moth is annual.
How to fight
Old hemp and dry shoots should be cut out mercilessly, and plant residues should be removed and burned. It is also important to know that the fight against currant bud moth will be effective only before flowering, especially during the period of bud swelling.
If for each currant bush there are three to five overwintered caterpillars, the currant bushes begin to be treated with insecticides.
In the plantations of currants, where the damage caused by the currant kidney moth is especially significant, as soon as the snow melts, in early spring, spraying with the emulsion "Rovikurta" or "Anometrina-N" is carried out (for ten liters of water - 10 ml of a 25% concentrate of the prepared emulsion). You can also carry out the treatment with "Permethrin" or "Kilzar". The use of Karbofos emulsion immediately after flowering also leads to the death of butterflies. A good effect can also be achieved by spraying with Aktara or Iskra Double Effect.
Among the folk remedies for combating currant kidney moths are infusions of celandine, tansy, stepchildren and tops of tomatoes, as well as mustard.
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