2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Stem cabbage lurker is a big lover of cabbage, radishes, turnips, mustard, rutabagas with spring rape and other cabbage crops. Plants attacked by these villains begin to stagnate and often die. The flowering shoots on the growing testes gradually break, the leaves die off and subsequently fall off, and the seeds are noticeably flattened. The damage from the harmful activity of gluttonous parasites can be significant, therefore, if they are present on the site, it is necessary to take decisive measures
Meet the pest
Stem cabbage lurker is a harmful grayish-brown beetle, the size of which ranges from 2.5 to 3.2 mm. Near the shield, you can see a white-colored quadrangular speck. Long and very thin head tubes of pests are bent under their breasts, while keeping within between the coxae of the front legs. And their antennae are club-like.
Oval and transparent eggs of cauliflower stalkers reach 0.8 mm in size. The yellowish-white larvae are endowed with brownish heads and grow up to 5 mm in length. Their body is slightly bent, and the legs are completely absent. And the size of free yellowish pupae is about 4 mm.
Immature beetles overwinter in gardens, parks, forest belts and on forest edges under plant remains. They wake up in the first half of April, immediately after the temperature of the upper soil layer warms up to eight or nine degrees. Initially, they feed on wild cabbage plants, and later on cultivated ones (forage, vegetables and oilseeds). Moreover, they find them not only in the fields, but also in greenhouses on seedlings. Pests gnaw through the epidermis in thick veins and cuttings, eating the flesh in the form of miniature chambers. The tissues around such chambers begin to grow rapidly, and some time later, you can already notice small swelling - "warts". Sometimes gluttonous parasites damage the tops of young stems on the testes and cabbage seedlings, and also gnaw holes in the leaves.
With the onset of May, females begin to lay three to four eggs. Most often, eggs are placed in medium leaf veins, a little less often in stems with cuttings. The total fertility of females reaches forty to sixty eggs. The places in which the females lay their eggs swell, vaguely resembling warts. Approximately after 4 - 7 days, tiny larvae hatch, which first gnaw holes in leaf cuttings, and then move down to the middle of the stems, sometimes reaching the root necks. On large leaves, the development of parasites most often ends in cuttings, and they usually turn into stems when the leaves are smaller. It will not be difficult to notice the moves made by the larvae - they are brown stripes that are clearly visible to the eye. It is noteworthy that up to fifteen to twenty larvae often develop in one leaf.
The development of harmful larvae ends in about twenty to thirty days, and after this time they burrow into the soil and pupate there at a depth of two to three centimeters in earthen cradles. And after eighteen to twenty days, approximately in June-July, tiny bugs appear, migrating to wintering places after a short feeding period. As a rule, the one-year generation is characteristic of the cauliflower stalker.
How to fight
The most important measure to reduce the number of gluttonous pests is autumn fall plowing. It is equally important to systematically eliminate growing weeds. Also, undamaged seedlings should be selected for planting various crops.
If there is one or more bugs per plant, it is advisable to start spraying with insecticides. As for spraying on the seed plants, they are best done at the very beginning of budding.
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