2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Rapeseed Seed Lurker lives literally everywhere, feasting on rapeseed, cabbage, turnips, turnips, radishes and a number of wild cabbage crops. Despite the fact that only one generation of these parasites develops throughout the year, they cause considerable damage to the crop. If you do not take the time to take measures against these harmful weevils, you can definitely not dream of a good harvest
Meet the pest
The rape seed lurker is a black beetle covered with light hairs and scales, growing in length up to 2, 2 - 3 mm. At the intervals of the elytra of the parasites, it is possible to notice predominantly hair-like scales, and the oval scales are located mainly exclusively at the points of the grooves located near the scutes. The thin head tubes of these pests are slightly bent under their breasts.
The size of the shiny eggs of rapeseed burrowers is about 0.5 mm. All eggs are round oval and white in color. Legless slightly curved larvae, growing up to 4 mm, are also white, and their heads are brownish. And the light yellow pupae of the pests reach a length of about 2.5 mm.
Wintering of harmful beetles can take place not only in the surface soil layer, but also in the remains of plants in those fields where these parasites previously fed. When the average daily April temperature reaches seven to eight degrees, the bugs wake up and go to additionally feed, first on weeds, and a little later on the testes of radish, cabbage and other cabbage crops.
The adults of rapeseed seed lurkers gnaw tiny depressions in buds and pedicels with stalks, and after ten to fifteen days they mate. Approximately in May, as well as in early June, females lay eggs inside young pods - most often one or two eggs. The process of oviposition in rapeseed seed lurkers generally takes about twenty to thirty days, and the total fecundity of females at the same time reaches from thirty to fifty eggs. After about a week and a half, voracious larvae hatch, feeding on young seeds - as a rule, they either bite inside or gnaw them outside. In principle, they can do both at the same time. On average, each larva at the stage of its development damages from six to nine seeds. At the same time, pods inhabited by hungry parasites do not outwardly differ in any way from healthy ones.
After about twenty-five to thirty days, the well-fed larvae finish their development and, making holes in the walls of the pods damaged by them, fall to the soil. They pupate in it at a depth of two to four centimeters. And already in July, you can observe the release of new generation beetles, which are always happy to feast on cabbage weeds. With the onset of autumn, the gorged bugs go to winter in pre-prepared places.
How to fight
When planting cabbage seed plants, it is extremely important to observe spatial isolation. Another important measure is deep autumn plowing of areas where testis used to grow. During the period of mass pupation of larvae, it is necessary to loosen the soil in the most thorough way, and weeds from the cabbage family must be destroyed. Well, the seeds should be thoroughly dried immediately after threshing.
If about a tenth of the total volume of cultivated crops is inhabited by pests, or there are a couple of bugs for each plant, then at the stage of bud formation, planting of cabbage crops is treated with insecticides.
The parasites Aneuclis melanarius Hobmgr are natural enemies of the rapeseed lurkers, which help to significantly reduce their numbers.
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