A. B. M. REZAUR RAHMAN1* and MD. KAMRUL ISLAM2
1Scientific Officer, 2Senior Scientific Officer, Cotton Research Farm, Cotton Development Board, Sreepur, Gazipur, Bangladesh. *Corresponding author’s Email: abmrezaurrahman@gmail.com
ABSTRACT
The experiment was conducted at Cotton Research Farm of Sreepur under Gazipur, Mahigonj under Rangpur, Sadarpur under Dinajpur and Jogodispur under Jessore district of Bangladesh during from July 2015 to June 2016 to evaluate the effectiveness of some botanical extracts against cotton sucking insect i.e. aphid, jassid and white fly at four (4) research centers of Cotton Development Board located at Sreepur, Sadarpur, Jagadishpur and Mahigonj. The experiment consisted of eight treatments T1 = Control (Untreated), T2 = Mehagony seed extract, T3 = Khuksha leaves extract, T4 = Chirata leaves extract, T5 = Garlic extract, T6 =Azadiractin (Leaf and kernel extract of Neem), T7 = Bael leaves extract, T8 = Marigold leaves extract were allocated in the field following Randomized Complete Block Design with 3 replications. The incidence of sucking pests was recorded once in a week from 10 randomly plants at each plot. Spraying was done when the pest population crossed the ETL level. Significant differences were found in the relative efficacy of different treatments in reducing the jassid population and their persistence at different hour after treatments (24, 48 and 72 hours). The leaf and kernel extract of neem was found the best in controlling jassid., after 24, 48 and 72 hours of spraying and increased cotton yield as the highest yield 3.13 t/ha, 3.11 t/ha, 2.87 t/ha and 2.89 t/ha at Gazipur, Rangpur, Dinajpur and Jessore farm respectively compared with other treatments. Plant extracts are biopesticides having less or no hazardous effects on human health and environment. Thus they can be incorporated in IPM programs in cotton cultivation.
Keywords: Cotton, Aphid, Jassid, White fly, Pest Management and Botanical extract.