2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
The pale meadow moth is found literally everywhere. Especially often this parasite can be encountered in central Russia and the Caucasus. It mainly damages the testes of carrots and parsnips, as well as some other umbrella crops. The result of its harmful activity is a noticeable decrease in the quality of seeds and a significant decrease in yield. Harmful caterpillars severely damage the testes of umbrella plants - they not only gnaw fragile pedicels, but also damage the buds with immature seeds
Meet the pest
The pallid meadow moth is a light-colored butterfly with a wingspan of 27 to 34 mm. Its front silvery-white wings are characterized by a greenish tint. In addition, they are equipped with round specks and gray fuzzy bands. And at the front edges of the white hind wings, you can see small gray spots.
The size of eggs of pale meadow moths reaches 0.6 - 0.7 mm. They are slightly flattened and painted in milky white tones with a barely perceptible greenish tint. Caterpillars, growing in length up to 18 - 19 cm, are endowed with yellow chairmen with black spots, and gray stripes run along their backs. The body of the pests is covered with black warts, each of which is equipped with one or two hairs. And the color of harmful parasites can vary from yellowish-green and whitish to reddish. Pupae reach 18 mm in size and are located in oval-shaped spider cocoons with soil particles adhered to them.
Caterpillars that have finished feeding overwinter in the soil. With the onset of spring, approximately in the second half of May, they pupate. And already in the first half of June, one can observe the emergence of butterflies, which begin to lay eggs on the inflorescences of all kinds of umbrella crops. The total fertility of females reaches an average of one hundred to one hundred and twenty eggs.
The embryonic development of pallid meadow moths lasts for ten to twelve days. The revived voracious caterpillars make their way inside the umbrellas, forming spiderweb tubes in them. In these tubes, harmful parasites settle in groups. Their main food is flowers and underdeveloped seeds. A little less often, they can pay attention to the leaves. Often, pests feed on flowers and seeds of hogweed, annual gill, horticultural and wild carrots. Fennel, celery, parsnips and dill are not ignored either.
Having finished their development, which takes an average of twenty-five days, the caterpillars move into the soil and curl there in cocoons until spring. A single generation of pale meadow moths develops during the year. They live by gathering in communities and making rather dense silk tubes.
How to fight
It is recommended to subject areas from under the seed plants of various umbrella crops to deep autumn plowing. In addition, the testes of these crops of last year's crops are recommended to be removed from other crops by about 500 - 1000 m.
They begin to treat the testes with biological products or insecticides if, at the stage of larval revival, three or four caterpillars begin to fall on one plant, and thus about 10% of growing crops will be covered. Spraying with "Entobacterin-3" will serve well. This drug must be used in strict accordance with the instructions. Also, against harmful parasites, umbrella crops are pollinated with sodium fluorosilicate. As a rule, after ten days, similar pollination is repeated.
Tahina flies, braconids, ichneumonids and other endoparasites contribute to the limitation of the number of pale meadow moths.
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