TIIE IMPAC OF HORTICULTURAL AND AGRICULTURAL MINERAL OILSN TO THE FEEDING AND OVIPOSITION BEHAVIOTTR OF DIPORINA CITM KUWAYAMA (Hemiptera: kyllidae)

Its role as a vectot of huanglongbing disease has made Diaphorina cffrf the most importanf pest in citrus culture in Asia and America. Oils with carbon number nC2l (horticultural mineral oil) and nC24 (agricultural mineral oil) were promising control agent of D. eitri. Research was conducted to detemrine the effectiveness and ttre plausible mechanisms conributing these oils in zuppressiqg D. citripopulation The effect of oils in reducing the population of D. citri was evaluated under field condition using huanglongbing disease free hees and tees of unknown disease status. Oils, insecticides used in farmer practice and imidacloprid were applied on citrus trees. Oils were able to reduce the infestation of D. citri asmuch as imidacloprid. The population on those treaftnents was low and needed longer time for the initial infestation. The mechanisms of oils in reducing D. citripopulation were evaluated in choice and non-choice trials. Oils application reduced the proportion of D. citri stayed for feeding and for la)'rng eggs. It was mainly governed by olfactory response. Number of egg per bud. fecundity, hatchabiliry of eg-e and survirorship of nymph also decreased rvith the increase of oils concentration. Those results could be used for recommending mineral oils tbr controllin-e D. citri replacing convenriona