We studied the interactions between F1 progeny of Pectinophora gossypiella (Saunders) adults irradiated in the pupal stage and entomopathogenic nematodes. Both sexes of pink bollworm pupae were exposed to 4, 8, 12, or 16 krad substerilizing radiation doses irradiated using a 60Co source. The F1 larvae were tested in a sand bioassay for susceptibility to Steinernema riobravis Cabanillas, Poinar & Raulston, S. carpocapsae (Weiser), and 2 strains of Heterorhabditis bacteriophora (Poinar). The numbers of infecting nematodes were counted after 48 h. Increasing parental radiation dose significantly increased F1 larval susceptibility to S. riobravis and H. bacteriophora, but decreased susceptibility to S. carpocapsae. This difference in susceptibility may be caused by the sedentary nature of larvae from parents receiving higher levels of irradiation, combined with the passive ambush tactics used by S. carpocapsae to acquire an insect host. The need to sustain the F1 population of pink bollworm for sterility promotion and subsequent population collapse suggests S. carpocapsae to be an ideal entomopathogenic nematode to be used in conjunction with inherited sterility control methods.
- Heterorhabditis entomopathogenic nematodes
- Inherited sterility
- Pectinophora gossypiella
ASJC Scopus subject areas
- Insect Science