author(s)
Md. Anisur Rahman and Shabnam Sabiha

abstract
The experiment was conducted from 2013-2014 at Genetics and Molecular Biology Laboratory, Department of Zoology, University of Rajshahi in Bangladesh to evaluate the effects of carbofuran (granular) against pulse beetle Callosbruchus maculatus (F.). The black gram (Vigna mungo L.) seeds were treated with carbofuran and different reproductive potentials viz. fecundity, duration of immature stages, percentage of adult emergence and adult longevity of pulse beetles were investigated under laboratory conditions. Six doses of carbofuran (0, 20, 16, 12, 8 and 4 ppm) were used to pulse seeds treatment and the untreated female beetles after mating with males were released to lay eggs on treated seeds. Results revealed that the different doses of carbofuran induced significant (P<0.01) changes in the developmental period (34.76±1.00, 32.67±0.81, 32.57±0.94, 35.69±0.87, 36.06±1.70, 35.28±2.44; F_5,24=5.71) and percentage of adult emergence (67.66 ±16.40, 47.64±18.38, 67.53±15.22, 60.52±7.54, 71.92±3.68, 85.78±8.61; F_5,24=4.84) whereas fecundity (52.4±5.18, 38.8±9.04, 44.6±8.29, 40.4±6.46, 43.4±6.23, 41.2±7.66) and longevity of male (9.50±0.79, 9.44±0.85, 9.34±1.13, 9.76±0.37, 9.57±1.47, 10.25±1.81; F_5,24 = 0.38) and female (18.75±2.33, 21.37±2.27, 20.65±3.68, 21.05±1.52, 18.68±1.93, 21.03±1.60; F_5,24 =1.35) were not affected by any doses of treatments. Thus, the present findings indicated that 20 ppm carbofuran among other doses could be effective for C. maculatus population suppression. Further studies are still needed to determine the absolute dose levels to improve the control strategy of this pest species.