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The susceptibility of larvae and nymphs1 of the spider Tegenaria atrica C.L. Koch to four insecticides (Vertimec 018 EC, SpinTor 240 SC, Actara 25 WG oraz Fastac 100 EC) containing the active substances from different chemical groups was studied under laboratory conditions. Insecticides were applied by contact (insecticide-treated filter paper) or spray method. Vertimec 018 EC and Actara 25 WG were used at 0.05, 0.1 and 0.2% concentration, SpinTor 240 SC at 0.02, 0.04 and 0.08% solutions and Fastac 100 EC dose was 0.005, 0.01 and 0.02%. Results show that spiders vary in responses to insecticides. The most toxic for both developmental stages was Fastac 100 EC (mortality of larvae was 94.22–97.22%, nymphs1 85.72–97.14%). Tiametoxam and abamectin showed low toxicity and their doses suggested for commercial application are safe for the early stages of T. atrica. Low dose of spinosad was relatively safe (7.5–22.5% mortality), but higher concentrations posed a risk to this group of predators.

Susceptibility of developmental stages of the spider, Tegenaria atrica C.L. Koch to selected insecticides from different chemical groups