FECUNDITY, SEX RATIO, LIFE SPAN AND FEEDING CAPACITY IN DIFFERENT RESISTANT STRAINS OF THE PREDATORY MITE, AMBL YSEIUS GOSSIP! (EL-BADRY)

HASSAN, ABDEL-MONEM A.; EL -BEHEIRY, MEDHAT M.; OSMAN, ALI A.; EL-KHAWALKA, MOHAMED H.

doi:10.21608/ejar.1993.466140

FECUNDITY, SEX RATIO, LIFE SPAN AND FEEDING CAPACITY IN DIFFERENT RESISTANT STRAINS OF THE PREDATORY MITE, AMBL YSEIUS GOSSIP! (EL-BADRY)

Document Type : Original Article

Authors

¹ Sakha Agricultural Research Station, Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt

² Plant Protection Department, Faculty of Agriculture, Menofia University, Egypt

10.21608/ejar.1993.466140

Abstract

Four resistant strains of the predacious mite Amblyseius gossipi as well as a susceptible strain were chosen to study the effect of resistance on life span, fecundity, sex ratio and food consumption. The results showed that the egg incubation period of the resistant strains increased significantly in comparison with the susceptible strain. The resistant strains had longer laryal stage, lower fecundity and higher female ratio. Although the feeding capacity decreased as well, the resistant strains could withstand the frequent use of pesticides, and could survive in conditions in which their number is very low.