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The susceptibility of the 4 larval instar of the laboratory strain of Helicoverpa armigera (Hubner) to Abamectin efficiency was evaluated by using different techniques; i.e., dipping, surface film and immersion methods of technique. Abamectin was bio-assayed after 24, 48 72 and 96 hours from the treatment for each technique. The obtained results revealed that the order of the efficiency of the product used against the tested larvae was the same at both LC50 and LC90 values. The highest efficiency of Abamectin for dipping technique was attained 96 hours. The corresponding LC50 and LC90 values were 51.76 and 93.78 ppm, respectively, while, the lowest efficacy of the product was pronounced at 24 hours, the corresponding LC50 and LC90 values were 93.51 and 236.71ppm, respectively. Whereas the biological activity of the compound against the 4 larval instar fed on treated leaves for 48 and 72 hr. occupied middle situation among its efficiency at 24 and 96 hr. The corresponding LC50 and LC90 values of the tested biocide after 48 hrs., were 81.52 and 214.46 ppm. On the other hand these values after 72 hr. of feeding were 69.92 and 119.15 ppm, respectively. The susceptibility rates of the 4 larval instar to abamedtin toxicity at LC50 and LC90 values were 185.93 & 421.34, 135.34 & 378.25 , 114.66 & 211.64 and 95.58 & 124.29 ppm for surface film technique and 114.73 & 257.19 & 91.32 & 188.65 & 81.56 & 151.15 and 60.58 & 101.19 ppm for immersion method respectively. On the other hand, the susceptibility index as well as the potency levels at both LC50 and LC90 values increased with increasing the period determination .The latent effects of Abamectin on the pupation as well as the adult emergence was determined. The corresponding EC50 and EC90 values associated to quantal scoring of pupation due to dipping surface film and immersion bioassay were 2.63 & 120.51 , 82.02 & 198.12 and 45.45 & 137.42 ppm respectively. Whereas the corresponding IC50 and IC90 values for inhibition of the adult emergence were 20.14 & 91.02, 74.12& 136.22 and 43.22 & 101.32 ppm respectively.

TOXICITY AND LATENT EFFECT OF ABAMECTIN AGAINST THE AMERICAN BOLLWORM, Helicoverpa armigera (HUBNER)