Synthetic Juvenile Hormone: Effect on Pupae of the Spruce Budworm1

Publisher Website
Google Scholar
Abstract
A synthetic preparation of juvenile hormone (JH) was tested topically against two-, four-, and six-day-old pupae of Choristoneura fumiferana (Clemens). Only two-day-old pupae were sensitive to the treatment; low dosages prevented adult emergence or resulted in deformed adults. The ED50 values for the two-day-old male and female pupae were 5.7 and 0.3 microgram, respectively. Reproductive capacity of surviving adults also was affected. Mating ability of males was reduced very much and the females laid fewer eggs, which were less viable than the controls. The four- and six-day-old pupae were very tolerant to the JH. Adult emergence was affected only at very high dosages, and the reproductive capacity of adults surviving treatment as six-day-old pupae was affected hardly at all.

This publication has 0 references indexed in Scilit: