M.M. Hossain
Scientific Officer
Spices Research Center,BARI, Shibganj, Bogra
M.M. Kamal
Scientific Officer
Spices Research Center,BARI, Shibganj, Bogra
D. Sarker
Principal Scientific Officer
Spices Research Center,BARI, Shibganj, Bogra
A field experiment was conducted at SRC, Bogra during rabi 2011-2012 to test the efficacy of biorational pesticides and chemical insecticide (fipronil) against thrips in onion and garlic crop. The test crops were BARI Piaz-4 and BARI Rashun-2. Application of fipronil and spinosad + white sticky trap gave batter control of thrips i.e. below threshold level upto seven days after treatments application (6-10 thrips/plant) over all other treatments. The highest yield was obtained from the fipronil treated plots as well as highest economic return was also obtained from fipronil treated plot.
DEVELOPMENT, GARLIC, MANAGEMENT, THRIPS, ONION.
Spices Research Center,BARI, Shibganj, Bogra
Variety and Species
To asses the efficacy of bio-rational and synthetic insecticides against thrips infestation of onion and garlic.
The study was conducted at SRC, Bogra during rabi 2010-2011to test the efficacy of biorationals and chemical insecticide against thrips. BARI Piaz-4 and BARI Rashun-2 were used as test crop for this trial. Onion seedlings were transplanted in 18 December 2011 and garlic cloves were planted in 30 October 2011. Individual plot size for onion and garlic were 3m × 1.2m and 2m x 1.5m respectively. The spacing for onion was 15cm ×10cm and for garlic was 10cm ×10cm. Same treatments were used against thrips in both the trials. The treatments were T1=Neem seed extract @ 50g/l of water; T2= Spinosad (Tracer 45SC) @ 0.4ml/l of water; T3= White sticky trap; T4= Spinosad (Tracer 45SC) @ 0.4ml/l of water + White sticky trap; T5= Fipronil (Urogent 50SC) @ 0.5ml/l of water and T6= Untreated control. Treatments were assigned in RCB design with four replications. Thrips population was counted at 10 days interval starting from the first appearance of thrips infestation. The first spray was applied when the thrips population was observed at economic threshold level (6-10 thrips per plant, Hazara et al., 1999). Number of thrips (both nymphs and adults) was recorded before spray and after spray (i.e., after 24 hours, 72 hours and 7 days) from each observation from 20 randomly selected plants in each plot with the help of magnifying glass. All recommended agronomic practices were followed to raise the crops. Crop yield data were also recorded immediately after crop harvest. Data on thrips population and yield were taken and analyzed using MSTAT program and mean values were separated by DMRT.
Spice Research Report 2011-12, Spice Research Centre, BARI, Shibganj, Bogra
Fipronil and spinosad + white sticky trap found better against thrips control. The highest economic return was also obtained from fipronil treated plot followed by spinosad + white sticky trap treated plot in both onion and garlic. Among the two crops, population of thrips was found higher in onion than in garlic in both treated and non-treated plot, may be due to the less preference to garlic.
Report/Proceedings