Investigations on the Effects of Five Different Plant Extracts on the Two-Spotted MiteTetranychus urticaeKoch (Arachnida: Tetranychidae)

Abstract

Two-spotted mite,Tetranychus urticaeKoch (Arac.: Tetranychidae), is an economic pest worldwide including Turkey, causing serious damage to vegetables, flowers, and fruit crops. In recent years, broad-spectrum insecticides/miticides have been used to control this pest in Turkey. Control is difficult mainly due to resistance to conventional pesticides. This study was conducted to determine efficacy of pesticides extracted from five different plants [i.e.,Allium sativumL. (Amaryllidaceae),Rhododendron luteumS. (Ericaceae),Helichrysum arenariumL. (Asteraceae),Veratrum albumL. (Liliaceae), andTanacetum partheniumL. (Asteraceae)] against this mite. Bioassays were tested by two different methods to determine the effects of varying concentrations. Experiments were performed using 3 cm diameter leaf disk from unsprayed bean plants (Phaseolus vulgarisL.). In addition, the effects of the extracts on reproduction and oviposition were investigated. The extract yielded high mortality. In the lowest-concentration bioassays, the adult mites laid lower numbers of eggs compared to the untreated control. No ovicidal effect was observed.