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
Entomology Division,BARI, Gazipur
A field experiment was conducted at SRC, Bogra during rabi season 2012-2013 to test the performance of four different trap crops against thrips attack in onion. The experiment was laid out in a randomized complete block design (RCB) with the three replications. Treatments were T1=Carrot as trap crop; T2= Safflower as trap crop; T3= Maize as trap crop; T4= French bean as trap crop and T5= Untreated control. Use of Carrot as trap crop showed outstanding performance in controlling thrips over other treatments. The highest yield (18.9 t/ha) was also obtained from the plot treated with Carrot.
MANAGEMENT, ONION, THRIPS, TRAP CROPS.
Spices Research Center,BARI, Shibganj, Bogra
Variety and Species
To find out the best trap crop for onion thrips.
The field experiment was conducted at SRC, Bogra during of Rabi season 2012-2013 to test the performance of four different trap crops against onion thrips. The experiment was laid out in a randomized complete block design (RCB) with the three replications. The test crop was BARI Onion-4. Treatments were T1=Carrot as trap crop; T2= Safflower as trap crop; T3= Maize as trap crop; T4= French bean as trap crop and T5= Untreated control. Seedlings were transplanted on 18 December, 2012.Unit plot size was 4m × 2.2m and spacing was 15cm X 10cm. The crop was fertilized with/In addition to 5 t/ha of cow dung, the crop was fertilized with N110P52K75S20Zn4B1.5kg/ha. The entire amount of cow dung P, S, B, Zn, 1/3 N and ½ K was applied during land preparation. The rest N and K was applied in two equal splits at 25 and 50 DAT). The trap crop was planted at the same time when onion seedlings are transplanted in the field. All recommended agronomic practices were followed in production of onion. Thrips population was counted at 7 days interval starting from the first appearance of thrips in the field. Both nymphs and adults were recorded in each observation from 20 randomly selected plants in each plot with the help of magnifying glass. The weather data like temperature, relative humidity and rainfall were collected from regional weather station at Shibganj, Bogra during the study period. Data on thrips population and yield were taken and analyzed using MSTAT program and mean values were separated by DMRT.
Annual Research Report 2012-13, Spice Research Center, BARI, Shibganj, Bogra
35,000/-
A significant decrease of thrips population after every day after transplanting was observed over control due to use of trap crops (Table 1).Use of carrot as trap crop (4.77 thrips /plant) showed outstanding performance in controlling thrips in onion. In 59 days after transplanting (DAT) lowest number of thrips population (4.77 thrips/plant) were observed from Carrot treated plot which was statistically identical to Safflower treated plot (5.14 thrips/plant) and Maize treated plot (5.21 thrips/plant). Similar result was also found in case of 67 DAT, 75 DAT, 83 DAT, 91 DAT and 99 DAT. In 107 DAT similar trend of result were also observed except French bean treated plot. The highest yield of onion was also obtained from Carrot treated plot (18.95 t/ha) followed by Safflower treated plot (16.72 t/ha) and the Lowest yield were obtained from Control plot (11.21 t/ha).
Report/Proceedings