Efficiency of the biocide, emamectin benzoate and the hexaflumuron (igr)‎ in controlling the American cotton bollworm, Helicoverpa armigera (HÜBNER)‎ in laboratory

Abstract EN

The American cotton bollworm has been found to develop resistance against conventional insecticides.

This study is an attempt to investigate the efficiency of emamectin benzoate and hexaflumuron, (biorational insecticides) on the eggs and the 1st instar larvae of Helicoverpa armigera (Hübner), under the laboratory conditions.

The Hexaflumuron was ineffective insecticide when eggs were treated by field rate compared to emamectin benzoate and alpha cypermethrin that induced 100% mortality only when the recommended field rate was applied.

The LC50 values of emamectin benzoate, hexaflumuron and alpha cypermethrin on the 1st instar larvae were 0.0041, 2.442 and 11.362 ppm, respectively based on formulated materials.

The results showed that emamectin benzoate, hexaflumuron were more effective insecticides compared to alpha cypermethrin.

The mean larval duration periods were12.0, 13.7, 15.0 days when treated with the LC25 values of emamectin benzoate, hexaflumuron and alpha cypermethrin compared to 16.0 days recorded for control.

It is obvious that the three tested insecticides induced highly significant increase in larval and pupal mortality.

The longevity of adult moths attained 8.0, 9.0, 11.0 and 15.5 days for female; 8.0, 7.5, 11.0 and 14.0 days for male resulting from the 1st instar larvae treated with emamectin benzoate, hexaflumuron, alpha cypermethrin and control, respectively.

Emamectin benzoate and hexaflumuron showed severe reduction in female moth fecundity, eggs fertility and hatchability.

Therefore, the two compounds could be recommended to control this pest, especially they are environment friends.