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Effects of a Juvenile Hormone Mimic on the Pink Bollworm12

1974; Oxford University Press; Volume: 67; Issue: 2 Linguagem: Inglês

10.1093/jee/67.2.173

1938-291X

Agripino Cawich, L. A. Crowder, T. F. Watson,

Marine Biology and Environmental Chemistry

Topical applications of the juvenile hormone mimic (4-6 ethyl phenyl-6,7-epoxy geranyl ether) on larvae of Pectinophora gossypiella (Saunders) caused retention of larval characters in the resultant pupae at lower dosages and additional prepupal and larval stages at higher dosages. Non-diapause (ND) and diapause (D) larvae responded similarly, but higher dosages were required for similar effects on D larvae. Adult emergence was inhibited in both ND and D larvae, but again higher dosages were required in D larvae. Laboratory-induced diapause (LID) larvae were slightly less sensitive than field-induced diapause (FID) larvae to morphogenetic effects and inhibition of adult emergence. Topical applications of the juvegen also induced the termination of diapause in both LID and FID larvae. A biossay based on a graded scoring of the retention of larval chamcters was consistent, practical, and easy to perform, and can be used to screen juvenile hormone mimics for morphogenetic activity on pink bollworm larvae.