Wrażliwość trzeciego stadium pędraków chrabąszczy (Melolontha spp.) na kontaktowe działanie insektycydów neonikotynoidowych

Autorzy

• Henryk Malinowski Instytut Badawczy Leśnictwa w Warszawie, Zakład Ochrony Lasu
  Sękocin-Las, 05-090 Raszyn
  e-mail: H.Malinowski@ibles.waw.pl

Abstrakt

Experiments were conducted on the susceptibility of third instar Melolontha spp. white grubs to the contact action of neonicotinoid insecticides under laboratory conditions. The insecticides used were: a) SP and WG (water suspension) formulations: acetamiprid (Mospilan 20 SP containing the active substance at 200 g l^-1 ), clothianidin (Apacz 50 WG containing the active substance at 500 g kg^-1); b) GR (granular) forms: clothianidin (traditional formulation containing the active substance at 10 g kg^-1), imidacloprid (slow release form containing the active substance at 50 g kg^-1); and carbosulfan as a standard insecticide (GR slow release form containing the active substance – Marshal Suscon 10 CG – at 100 g kg^-1). The experiments confirmed the low sensitivity of third instar Melolontha white grubs to the contact action of these insecticides. Insecticides of SP and WG formulations applied to the soil at a dose of 25 mg active substance kg^-1 soil did not cause 100% mortality after 28 days of exposure. In the case of clothianidin, mortality after 28 days was 40% and in the case of imidacloprid it was 80%. GR forms containing clothianidin (traditional formula) used at a dose of 50 mg kg-1 soil, and imidacloprid (slow release form) used at a dose of 250 mg kg^-1 soil, caused 70-80% mortality after 28 days. Carbosulfan GR (slow release form), used as a standard at a dose of 500 g active substance kg^-1 soil, caused 100 % mortality after 28 days.

Słowa kluczowe

• white grubs susceptibility
• neonicotinoid insecticides
• contact activity