Six juvonoids viz. HS-103, Ro-10-3108, A13-34601a, A13-34853, A13-35477 and A13-70033b were tested for ovicidal effects on 1. 6, 12, 24, 48, and 60 hour old eggs of Utetheisa pulchella L with 1, 10, 100, 1000 and 10000 ppm concentration. All the tested compounds revealed a negative correlation in ovicidal activity with the advancing age of eggs and a positive correlation with the rise in concentration. Eggs of younger ages were sensitive and susceptibility declined sharply in 24 hour old eggs leading to further ineffe- ctiveness in much older eggs. Among the tested compounds, Ro-10-3108 depicted the highest inhibitory effect on hatching.
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