2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
The striped seed beetle is polyphagous and can damage very different crops. Its main habitat is forest-steppe and woodland. The larvae of the striped sowing nutcracker willingly eat young roots of cereals, and also damage root crops, stems, tillering nodes and sown seeds. The damage caused by the larvae of two and three years of age is especially noticeable. Adults of this variety of clickers are less harmful. Males are generally completely harmless, and females, although they go through the stage of additional feeding on the leaves of cereal crops, do not cause too much harm
Meet the pest
The striped seed beetle is a dark brown beetle ranging in size from 7.5 to 11 mm. On its elytra, light stripes alternate harmoniously with dark ones, and the antennae and legs of the pest are painted in light brown tones. The color of the larvae, often growing up to 27 mm, can vary from yellow to pale white shades, and on the sides they have bright dark yellow specks. The last segments of their bodies have a conical shape and are endowed at the bases with a pair of deep pits.
Wintering of beetles, as a rule, takes place at a depth of ten to fifteen centimeters in the soil, and the depth of occurrence of uneven-aged larvae is from twenty to thirty centimeters. Beginning in the second decade of May, the bugs get out to the surface. Their release continues, depending on temperatures, until mid-June. The harmful gourmets are especially active in the morning and in the evening, and at night and during the day they hide in the shelters they have chosen in advance. They feed mainly on the pollen of flowering plants. Cereals are no exception.
Eggs are laid by females in compact heaps, each of which contains no more than three to five eggs. They have a slightly oval shape and reach a length of 0.5 mm. Most often, egg-laying is placed near corn crops in the ground or at a depth of three to five centimeters in the grass sod. On average, each female lays sixty to two hundred eggs. The duration of the incubation period is directly related to the temperature regime and, depending on it, can range from thirty to sixty days.
The period of development of larvae in striped sowing nutcrackers is quite long and is up to four years. The revival of the new generation larvae is observed in June, as well as at the beginning of July. They pupate approximately in July or in August in the fourth year of their development. The average duration of the pupal phase is about two to three weeks, and at rather low temperatures in the region of 15-16 degrees, it can be from four to seven weeks.
Particularly attractive for the development of larvae are highly moistened soils, characterized by an increased content of humus and plant residues. Usually peatlands, as well as meadow-peat and meadow soils, fall under these criteria.
How to fight
An important role in the fight against striped sowing nutcrackers is assigned to well-known agrotechnical measures, including autumn plowing along with careful systematic soil cultivation, liming and disking of the soil, fertilization (ammonia and potash will be especially preferable), as well as the elimination of weeds. It is also important to observe crop rotation, as well as to include in it minimally damaged crops, which include flax, millet and mustard.
During the budding period, it is useful to introduce biological preparations made on the basis of entomopathogenic nematodes into the soil.
Seed material, seedling roots and potato nodules are recommended to be treated with pyrethroids, neonicotinoids, as well as well-proven organophosphorus compounds.
It makes sense to carry out exterminatory measures against the striped sowing nutcracker only if five to eight larvae are found on each square meter of cultivated crops.
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