Toxicity of selected insecticides to Pieris brassicae L. (Lepidoptera: Pieridae)

[摘要]  The toxicity of carbaryl, pirimicarb (pirimor) and commercial formulation of neem using leaf dip and larval-dip techniques against second and third instars of Pieris brassicae L. larvae was determined. Larval mortalities rates were significantly higher with carbaryl and pirimor compared to the neem in the larval-dip bioassays 24-h after treatment. In the leaf-dip bioassays, the highest concentrations of carbaryl and pirimor caused 80% to 100% mortalities of larvae. Neem exhibited a significant lethal and antifeedant effects on second and third instars larvae, although the effect was slow and varied among the different larval instars. Quick cessation of food consumption of larvae on treated leaves was observed. Consequently, there was a negligible damage on the insecticide treated leaves. Based on the data collected in the current study it could be speculated that carbaryl and pirimor may have unduly residue on treated plants, therefore; neem extract is merit to be considered as a suitable control agent against P. brassicae larvae

[学科分类] 昆虫学

[关键词] Bioassay;Cabbage;Large white butterfly;Leaf-dip technique