Jalali, S.K.Singh, S.P.Biswas, S.R.2014-09-092014-09-092000J. ent. Res., 24(2): 159-162 (2000)http://hdl.handle.net/123456789/5546The response of the encyrtid parasitoid, Leptomastix dactylopii Howard, to various densities of its host mealybug, Planococcus citri Risso, was investigated in the laboratory. Per cent parasitisation decreased, and adult parasitoid emergence increased, with the increase in host density. Development of immature stages did not differ among different density levels. Per cent female progeny was greater at lower densities. A positive correlation between density and the number of adults emerged, and a negative correlation between density and parasitisation was observed. A parasitoid: host ratio of 1: 100 was optimum for parasitoid use and mass production of L dactylopii.enArticle