Evaluation on the controlling effects of eight insecticides on the natural population of citrus leaf-miner Suppressive effect of secondary substances on Liriomyza sativae population Evaluation of non-host plant ethanol extracts against Plutella xylostella population Repellency of α-pinene against stripped flea beetle,Hyllotreta striolata(F). Suppressive effects of non-preferable plant alcohol extracts on diamondback moth Plutella xylostella population