| impact of selected pesticides on field population dynamics of parasitic hymenoptera (pteromalidae) in caged-layer poultry manure in southern california, u.s.a. | field studies were conducted at caged-layer poultry facilities in southern california, u.s.a., to determine the effect of selected pesticides on beneficial pteromalidae. weekly parasite sampling was conducted using sentinel musca domestica l. pupae to assess changes in parasitization in relation to pesticide treatment. sites were sampled weekly for 5 weeks before treatment and for 8-10 weeks post-treatment. treatments were applied twice to six hen houses (four treated plus two controls) at each ... | 1990 | 2132990 |