Selection with Bacillus thuringiensis subsp. kurstaki, which contains CryIA and CryII toxins, caused a >200-fold cross-resistance to CryIF toxin from B. thuringiensis subsp. aizawai in the diamondback moth, Plutella xylostella. CryIE was not toxic, but CryIB was highly toxic to both selected and unselected larvae. The results show that extremely high levels of cross-resistance can be conferred ...

The accurate measurement of parasitoid impact on diamondback moth, Plutella xylostella (L.) populations is important to both the evaluation of exotic parasitoids for introduction, and to the integration of parasitoids with other cropping practices, particularly pesticides. Parasitoid impact is usually measured by samples for percent parasitism. Problems with the accuracy of this approach, and i...

Resistance to organophosphorus, carbamate and pyrethroid insecticides in the diamondback moth, Plutella xylostella (L.) is widespread in Japan. Consequently, tertiary amines such as cartap and thiocyclam, microbial insecticides (formulations of Bacillus thuringiensis Berliner) and chitin synthesis inhibitors have been widely used for control. A high level of resistance to these alternative inse...

The diamondback moth, Plutella xylostella (L), is recognized as a widely distributed and serious pest of crucifers in many countries. In some countries, however, it is effectively suppressed by parasites. These are critically examined as are the various attempts to import parasites and to release them. The appraisal reveals that the parasites of P. xylostella are a valuable control component an...

Applications of sublethal concentrations of methomyl to 4th instar larvae and pupae of the diamondback moth resulted in increased fecundity of the adults which emerged. The adult females derived from the treated pupae laid more eggs with a higher rate of fertilization as compared with the untreated check. However, the adult females thus treated had a shorter life span than the untreated ones. T...

In order to improve the chemical control of diamondback moth, Plutella xylostella (L), in Taiwan, the Taiwan Agricultural Research Institute organized in 1980 a program aimed at analyzing the insecticide resistance and mode of action. After almost five years of study, we have gathered information on the sampling method, resistance, cross resistance, the mode of insecticide action, and the effic...

Effects of nectar-producing plants (NPP) on the longevity, fecundity, oviposition and nectar-collecting behaviour of Diadegma insulare were studied. Longevity and fecundity of D. insulare were varied with morphological characters of NPP’s flowers. Brassica kaber (D.C) Wheeler, Barbarea vulgaris R. Br. and Daucus carota L. supplied nectar and resulted in D. insulare longevity and fecundity equal...