Effect of gamma irradi&tion of male full grown pupae of
P242.pera littoralis (Boisd..) in the parental generation on
the susceptability of the larvae produced in Fi generation
to extracts of two plant species; namely; Tafia (Nereum
oleander) and Nabk (Flacourtia indica) were determined.
Larval mortality depended on radiation dosages, type of
plant extracts and solvents. Radiation dosages alone did not
apparently affect Fi larvae, but joint treatment with irra—
diation plus plant extracts effectively suppressed larval
development with 2.5 or more times in comparison with irra
diation and plant extracts separately. The toxicity of plant
extracts to Fi larvae (whose male pupae had been irradiated)
was more than its toxicity to the larvae produced from unir—
radiated parents.