2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
The scorched cruciferous moth, a member of the Pyraustidae family, is almost ubiquitous and damages mustard and turnip, rapeseed with radish, and radish with cabbage. It is mainly the caterpillars that harm, first fastening the pods and the tops of the shoots with cobwebs, and then making holes in them and eating away the seeds. If you do not start a timely fight with these garden pests, the consequences can be quite dire
Meet the pest
The scorched cruciferous moth is a rather attractive butterfly with a wingspan of 20 to 28 mm. The wide front wings, framed by dark fringes and equipped with a pair of oblique dark brown lines, are characterized by a light yellow color. The hind wings are set off by a luxurious dark brown fringe, and the wings themselves are painted in yellow and white tones.
The oval pale yellow eggs of the scorched cruciferous moths are about 0.4-0.5 mm in size. Yellowish-greenish caterpillars grow in length up to 15 - 18 mm. Their entire body is dotted with dark dots, and there are gray stripes on the sides. The bifurcated occipital plate and the heads of voracious pests are always black. The size of brownish pupae ranges from 9 to 11 mm, and they are usually located in dense spider cocoons.
Caterpillars overwinter in the ground inside cocoons, at a depth of up to fifteen centimeters. With the onset of spring, they pupate, and cute butterflies begin to appear in May. Eggs are laid by females in a tile-like manner, in five to eight pieces, located on weed pods, as well as on a number of cultivated cabbage plants. Caterpillars hatched from eggs make their way deep into the pods and start feeding on underdeveloped grains. Having eaten the seeds in one pod, the gluttonous parasites pass into the next, pulling them together with cobwebs and gnawing holes in them. Towards the end of June, caterpillars pupate in the surface soil layer or on vegetation. Pupation, as usual, takes place in cocoons. And a small part of caterpillars falls into a state of diapause in the soil and remains in this form for the winter. At the end of July, butterflies of a new, second generation appear, flying until about mid-August. Most often, the development of caterpillars of this generation is observed on the testes of radish and cabbage. And at the end of August or at the very beginning of September, the grown caterpillars go to winter in the soil. During the year, two generations of the scorched cruciferous moth develop.
How to fight
Proper cultivation in combination with deep autumn plowing is considered the best preventive measure against scorched cruciferous moths. An equally important measure is the systematic elimination of weeds, which serve as a natural wintering place for gluttonous parasites.
They begin to move to spraying with insecticides if the damage to the growing crops is especially strong. It is allowed to carry out treatments with "Karbofos" or "Chlorophos".
Pheromone traps are widely used for monitoring and mass trapping of scorched cruciferous moths.
And among folk remedies, ash broth has proven itself very well, which can be simultaneously used as an excellent foliar feeding. To prepare it, pour boiling water over 300 g of well-sifted ash and boil for twenty-five minutes. Then the mixture is filtered and diluted with ten liters of water. And so that the composition sticks better, it will be useful to add 50 g of soap.
You can also pollinate growing crops with dry ash or dust them with a mixture of tobacco dust and ash, taken in equal proportions.
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