2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Green barid, also called rutabaga, is a harmful weevil that eats cabbage and other cruciferous crops with great pleasure. You can meet him almost everywhere; especially many such parasites are found in the forest-steppe and woodlands. If in the middle of cabbage stumps on longitudinal sections, larval sinuous passages filled with excrement and dust began to appear, then it is time to take measures to combat this pest. Only a timely fight and appropriate preventive measures can help overcome this parasite
Meet the pest
Barid green is a rather dark beetle, the size of which ranges from 3.5 to 4.5 mm. The beetle has a blue-greenish color with a metallic sheen. The parasite has thin grooves on the elytra, and although the head tube is bent, it does not bend under the chest.
The size of white with a matte shade of oval pest eggs is approximately 0.6 - 0.9 mm. The length of the arcuate, legless, whitish larvae is 5 - 10 mm, and the size of the little white pupae is 8 - 9 mm.
Beetles often hibernate in the soil, sinking there to a depth of about five centimeters, less often - eight to nine centimeters. It is extremely rare to find wintering individuals in cabbage cobs. In the spring, as soon as the upper soil layer warms up to 7 - 9 degrees, harmful beetles get out and begin to feed first on weeds, and then on cabbage crops. The parasites gnaw out numerous pits on the riding buds, leaves and stems. And in seed cabbage, noxious barides still eat away the cores of the parts of the stalks underground. Vegetation areas affected by pests first turn yellow, and a little later, many growths begin to form on them. Young plants noticeably lag behind in growth, and sometimes, if they were very badly damaged, they even die.
In late April - early May, female barids begin to lay eggs in the fossa gnawed in the apical buds, in the leaf petioles and in the stalks of the fossa. The total fertility of these females is up to a hundred eggs. After 6 - 11 days, larvae begin to hatch from the eggs, feeding inside the vegetation, mainly in the stalks. As a result of the destructive activities of uninvited guests, the vegetation begins to lag behind in growth, and the yield is significantly reduced. If there are a lot of pests, then the plants often die. The development of the larvae takes about 25 - 30 days, after this period they pupate. Beetles that flew in July-August, after some time, go to winter. Baride green generation is usually one year old.
How to fight
After harvesting, it is imperative to eliminate all plant residues from the site. It is also necessary to regularly destroy weeds from the cabbage family, which is extremely attractive to pests. A good preventive measure is peeling, as well as deep autumn plowing. During the growing season, plants need to be given high-quality fertilizing.
It is also recommended to avoid growing cabbage in areas where any cruciferous crops have previously grown.
If about ten percent of the vegetation has suffered from pests, and also if there is one or a pair of beetles for each plant, the plantings are treated with insecticides. This must be done before the parasites begin to lay eggs. When beetles appear, and then at the beginning of budding, the plants are also sprayed with chlorophos.
It is possible to significantly reduce the damage to cabbage crops by voracious barides by spraying it three times with polychloropinene emulsion (0.7%).
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