Abstract

Biology of Helicoverpa armigera Hubner was studied on rose under laboratory condition at 24.03 ± 1.75 0 C and average relative humidity of 53.9 ± 3.04 per cent during November - December 2006. The egg, larval, pupal and adult periods were 3.72 ± 0.79, 24.16 ± 2.25, 10.44 ± 1.36 and 5.40 ± 1.04 days for male and 8.84 ± 1.91 days for female, respectively. The life cycle was completed in 39.40 ± 2.33 days for male and 42.96 ± 2.47 days for female, respectively. The pre-oviposition, oviposition and post-oviposition periods were 2.76 ± 0.83 , 5.36 ± 0.99 and 0.84 ± 0.85 days, respectively. The female moth laid an average of 631.8 ± 208.3 eggs during its life span. The sex ratio (female: male) of 1: 0.72 was recorded in laboratory. Indoxacarb 0.0075 and spinosad 0.002 per cent were effective in checking the bud borer population with 1.29 and 1.57 larva/ plant and net CBR 1:6.00 and 1:8.34, respectively. The ascending order of remaining treatments in effectiveness was; novaluron, endosulfan, imidacloprid, thiamethoxam, clothianidin and acetamiprid.

Keywords: H. armigera , biology, rose, indoxacarb, spinosad.