Pest Type: Multi-Pest
Row: Coleoptera – Coleoptera
Family: Darkling – Tenebrionidae
It is widespread, but numerous in the south of the steppe zone. Beetles are multinivorous and damage various crops, however, dangerous for row crops and vegetable seedlings in spring and early summer.
Larvae feed on putrefactive plant debris, living plants almost do not damage.
The beetle is 7-10 mm in size, oval, with almost parallel sides, slightly convex, black or grayish-brown from the soil crust that covers the entire body. Clypeus front with a deep semicircular notch. Elytra with regular longitudinal rows of large tubercles; no hind wings.
Larva – up to 18 mm, flat-cylindrical, from dark gray to tawny-yellow color, with a dark head; opaque integument, bottom colored lighter. There are glasses. The upper lip and the clypeus have two club-shaped tips in the middle.
Beetles live 1 – 2 years, winter among plant debris in the fields and in the upper soil layer. They appear on the soil surface in the steppe zone in late March or early April, depending on the degree of soil warming.
In April, as a rule, mating is observed and in late April – early May, egg-laying, which lasts until the end of May – beginning of June. Females lay eggs in the soil to a depth of 2 – 5 cm in heaps, from a few to a dozen. One female can lay up to 100 eggs per season. The egg-laying period is very extended in time, from eggs laid in early May, larvae appear in the second half of this month, and from eggs laid later in mid-June. Their full development is completed in 35 – 40 days; larvae pupate in the soil at a depth of 3–6 cm; pupal development lasts 6–8 days. Adults appear in July and continue to emerge from the soil during August.
Larvae that were reborn from late clutches pupate in August – September, and beetles remain in Lyalechka until spring. Beetles inflict the most significant damage from the end of April to mid-May.
Protective measures. The poisoned bait method is used against sand lag beetles. This method is based on the ability of adults to eat plants and to accumulate under shelters. On 1 ha, up to 100 piles of green baits, treated with permitted insecticides, weighing 200-500 g each, are laid out. On one bait spend 2 – 10 g of insecticide.