2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Corn linger in Russia lives mainly in the south. The larvae of this pest damage the underground organs of vegetation (tubers, roots, stems, etc.), as well as the sown seeds of all kinds of agricultural crops. And the food of beetles is mainly weeds, birch, knotweed and other plants. Corn, beet, sunflower and a number of other crops are especially affected by the activity of corn lingering
Meet the pest
A corn linger is a black oval beetle with a length of 7, 3 to 9, 6 mm. Its body has a light bluish tint. The width of the pronotum of the pests is equal to the width of the elytra, and the arcuate posterior edges of the pronotum are directed with protuberances anteriorly. The elytra of the parasites have tiny punctate grooves.
The oval eggs of corn lollipops are endowed with sharp-rounded tips and reach a size of 0, 6 - 1 mm. And the larvae up to 20 mm long have a color from yellowish-brownish to gray-yellow shades. The first three segments of their bodies, as well as the heads, are colored brownish, and on the last segment of the bodies of harmful larvae, you can see several long hairs and as many as four spines. At the tips of the abdomens of pupae growing up to 7-10 mm, small forks equipped with closely spaced long tips can be seen.
Overwintering of uneven-aged bugs takes place not only in the surface soil layer, but also under all kinds of shelters. The larvae hibernate at a depth of twenty to forty centimeters. In the spring, they begin to eat away underground parts of plants and their seeds, and harmful bugs damage young shoots and seedlings, gnawing the stems and eating vulnerable cotyledons. The period of particular harmfulness of beetles is the period of time from the moment of pecking of tiny shoots to the beginning of the formation of the second pair of true leaves.
The life span of beetles is approximately two to three years, and the development of larvae covers a period from twelve to fourteen months. On the soil surface, beetles in the steppe zone are selected approximately in April, somewhere in the second half of it. They continue to leave their hiding places until the beginning of May.
In May, females begin to lay eggs in the surface soil layer. The average depth of their placement is from two to three to ten centimeters. The soils of the female corn lollipops prefer loose, and the egg-laying process lasts throughout the entire growing season - in total, each female is able to lay up to half a thousand eggs.
The whitish larvae of corn lollipops reborn from eggs are inactive and do not feed at all. In general, during the period of their life, which is about a year, they manage to shed eleven times. In the pupal stage, pests stay for about two to two and a half weeks. And the beetles emerging from the pupae are immediately capable of reproduction.
How to fight
Thorough spacing and fall plowing, as well as stubble plowing immediately after harvest, are considered good measures in the fight against corn lingering. Weeds, along with plant residues, should be promptly destroyed from the beds. It is extremely important to correctly rotate crops in a crop rotation. Presowing seed treatment with various insecticides will also do a good job. Tabu is considered to be an excellent systemic disinfectant.
To destroy corn lollipops, the bait method is quite widely used, according to which heaps of withering grass pre-soaked with insecticides are scattered over the site. Harmful insects mistake such heaps for shelters, climb into them and quickly die. The weight of each bait should be on average 0.5 kg, and for their impregnation, such preparations as Shar Pei, Borey or Break are suitable in an amount of two to ten grams per heap.
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