Abstract
Host parasitoid ratio for Plutella xylostella and its egg parasitoid Trichogrammatoidea bactrae was worked out under invitro conditions, at 26+1oC and 65% RH. Host to parasitoid ratio of 35:1 was optimum with parasitism and adult emergence of >90%. The ratio was on par with ratio range from 21-30:1. Mass rearing of the parasitoid for would be more economical when reared at the optimum ratio. Effective dose for inundative releases of the parasitoid for suppression of Plutella xylostella could be determined based on the field evaluation of the optimum host – parasitoid ratio (35 host eggs:1 female parasitoid).
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