M. Mahmudunnabi
Scientific Officer
Entomology Division, BARI, Gazipur
N. K. Dutta
Senior Scientific Officer
Entomology Division, BARI, Gazipur
A.K.M.Z. Rahman
Senior Scientific Officer
Entomology Division, BARI, Gazipur
D. Sarker
Principal Scientific officer
Entomology Division, BARI, Gazipur
S. N. Alam
Chief Scientific Officer
Entomology Division, BARI, Gazipur
The study was carried out during Kharif 2012 at experimental field of Entomology Division, BARI, Gazipur to develop an effective management approach against shoot and fruit borer of okra. The management package comprising of collection and destruction of infested shoots and fruits along with release of biocontrol agents (Bracon hebetor and Trichogramma evanescens) and spraying of Spinosad 45 SC (Tracer) @ 0.4ml/litre of water was found most effective against shoot and fruit borer of okra. This package resulted highest reduction of okra fruit infestation (62.09%) and fruit yield increase (87.69%) over control. Consequently, the highest marginal benefit cost ratio (MBCR) (2.94) was also obtained from this package.
Okra shoot and fruit borer, management, biocontrol agents
Pest Management
To develop an IPM strategy against fruit borer attacking okra.
The experiment was laid out in RCB design with three replications (dispersed). Okra seeds were sown on 12 April, 2012. The unit plot size was 3.0 m x 3.0 m and 60 cm row to row and 40 cm plant to plant distance was maintained. The fertilizer application was done as per recommended doses. The normal intercultural operations were done. The treatments were: T1= Collection and destruction of infested shoots and fruits at 7 days interval from first incidence of pest infestation + weekly release of Bracon hebetor and Trichogramma evanescens at 7 days interval starting from 30 days after sowing (DAS) and continued up to the last harvest, T2 = T1 + Spraying of Neem seed extract @ 50g /L of water at 7 days interval from first incidence of pest infestation and continued up to the last harvest, T3 = T1 + Spraying of Bt @ 0.4 g/L of water at 7days interval from first incidence of pest infestation and continued up to the last harvest, T4 = T1 + Spraying of Spinosad 45 SC (Tracer) @ 0.4ml/litre of water at 15 days interval from first incidence of pest infestation and continued up to the last harvest, T5 = Spraying of Emamectin benzoate (Proclaim 5SG) @ 1g/L of water at 7days interval from first incidence of pest infestation and continued up to the last harvest and T6 = Untreated Control.
The spraying was done by knapsack sprayer. The whole plant was thoroughly covered by spray emulsion. The number of healthy and infested fruits were recorded and weighed to calculate percentage of infested fruits at each harvest. The experimental data were analyzed by MSTAT-C software. Mean comparisons for treatment parameters were made by DMRT at 5% level of significance.
Annual Report 2012-2013, Entomology Division, BARI , Gazipur
40,000.00
The management package involving collection and destruction of infested shoots and fruits + weekly release of bio-control agents, Trichogramma chilonis and Bracon hebetor + spraying of bio-pesticide, Spinosad 45 SC can successfully control fruit borer attacking okra.
Report/Proceedings