Contact and residual toxicities of 30 plant extracts to Colorado potato beetle larvae

摘要: Abstract Contact and residual toxicities of 30 plant extracts were investigated on third instar larvae Colorado potato beetle, Leptinotarsa decemlineata. The samples collected during the spring summer 2002 dried ground. treated with methanol residue was eluted distilled water containing 10% acetone, resulting in extracts. In contact bioassays, beetle 40% (w/w) extract using a Potter Spray Tower. insects incubated at 28±2°C under 16 h: 8 h photo regime mortality recorded 24 h intervals for 7 days. exhibited varying toxicity to ranging from 0 – 91% after incubation Artemisia vulgaris, Hedera helix, Humulus lupulus, Lolium temulentum, Rubia tinctoria, Salvia officinalis, Sambucus nigra, Urtica dioica, Verbascum songaricum, Xanthium strumarium resulted significantly higher than control. Generally, prolonged...