the chemical compounds synthetized at the laboratory of faculty of science, Zagazig University. These compounds as follows: 3-amino-5-chloro-4-phenylazo-1H-pyrazole (A), 3- amino-5-mercapto-4-phenylazo-1H-pyrazole (B), 3-amino-5- hydrazino-4-phenylazo-1H-pyrazole (C) were tested on neonate larvae of spiny bollworm, Earias insulana (Boisd.) at constant conditions of 26± 1ºC. and 80 ± 5% R.H. Acute toxicity as well as their latent effects on the different stages of the survived larvae were studied. Corresponding to the acute toxicity, at LC50 level the toxicity effect of the three tested chemicals were in descending order as follows: A, C and B compounds. During larval stage, hydrazino phenyl pyrazole C caused significant prolongation in duration of the larval stage of spiny bollworm. All tested compounds revealed highly significant decrease in the weight of treated spiny bollworm larvae, pupation percentage and pupal duration compared to untreated larvae. In contrast, tested compounds A and B showed an increase on larval mortality percentage. On The other hand, adult emergence percentage was significantly affected by C compound, but sex ratio of emerged adults was not significantly affected compared to untreated larvae. A, B and C compounds shortened the male longevity compared with the untreated. The A compound shortened the female longevity compared with untreated. But C compound elongated the female longevity compared with the untreated check. All treatments decreased number of deposited eggs, which proved significant with A and B. Incubation periods were did not affected. Significantly A compound caused reduction in the hatchability of deposited eggs.