Study on life parameters in natural population of Spodoptera litura (Fabrieius) Effect of plant alcohol extracts on vegetable aphids and their parasitoids Suppressive effect of secondary substances on Liriomyza sativae population Repellency of α-pinene against stripped flea beetle,Hyllotreta striolata(F). Controlling effects of plant extracts and pesticides on Myzus persicae and Lipaphis erysimi populations Suppressive effects of non-preferable plant alcohol extracts on diamondback moth Plutella xylostella population Evaluation of non-host plant ethanol extracts against Plutella xylostella population Evaluation on the controlling effects of eight insecticides on the natural population of citrus leaf-miner Evaluation of the effectiveness of PxGV on the population dynamics of Plutella xylostella L