Toxicity of several insecticides to different instars nymphs of Bemisia tabaci and the repellent actions to the adults STUDIES ON THE INTERRELATIONSHIP AMONG DLYGONYCHUS UNUNGUIS HOST PLANTS AND AMBLYSEIUS FINLANDICUS Ⅱ.The effects of volatile on the correlation of host platns- Oligonychus ununguis-Amblyseius finlandicus Toxicity of spirotetramat to Bemisia tabaci biotype B and the impact on the biological parameters Bioactivity of volatile oils from Myoporum bontioides on Plutella xylostella