The encyrtidsAenasius advenaComp. andBlepyrus insularis(Cam.) are the key parasitoids of the striped mealybugFerrisia virgata(Ckll.) in many countries. Adult parasitoids were exposed to the guava leaves treated with 13 insecticides and 18 acaricides/fungicides. Diazion (0.05%) was found to be non‐toxic toA. advenaand least toxic toB. insularis.The other chemicals such as endosulfan (0.07%), phosalone (0.07%) and dichlorvos (0.20%) showed lesser toxic residual activity while chlorpyriphos (0.05%), carbaryl (0.10%) and fenthion (0.10%) had shown significantly higher residual activity to both the parasitoids. The fungicides, except triademifon, proved harmless toA. advenaand B.insularis.It is hoped that the results would help to plan the pest management programme in crops whereF. virgatais problematic.