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| Effect of Trap Crops (Tomato, Carrot, Wheat) on the Population of Thrips on Onion Crop |
Habib Ahmed Khosa, Mitha khan, Sher Azam, Imran Kaiser, Amir Bashir, Abdul Rahim. Muhammad Akram, Nisar Ahmed.Aalay Khan
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Abstract:
The experiment was conducted at Agriculture Research Institute Tandojam during the year 2018 to determine effect of trap crops (tomato, carrot, wheat) on the population of thrips on onion variety Phulkara, Wheat variety TD-1, tomato variety MAS-792 and carrot variety T-29 with plot size 6 m x 5 m (30 m2) in a three replicated with randomized completely block design (RCBD). The treatments included T1= Sole onion at recommended row x plant spacing, T2= Perimeter trap cropping: 3 rows of onion bordered with 1 row of tomato, T3= Perimeter trap cropping: 3 rows of onion bordered with 1 row of carrot and T4= Perimeter trap cropping: 3 rows of onion bordered with 1 row of wheat. The data was recorded for the period of 12 weeks. The results of the present study indicated that onion thrips population per leaf in sole crop (T1) was recorded as 14.30±1.28 on 1st week, it was slightly increased from (14.90±1.32 to 17.90±1.68) during 2nd week to 8th week of observation, afterwards the population started decreasing from 16.10±2.50 to 14.84±1.10 during 9th week to 12th week of observation. The pest population in trap crop ‘tomato’ was recorded as 14.00±1.10 on 1st week and then started in decreasing trend from 13.48±1.30 to 05.10±0.10 during 2nd week to 12th week of observation. In next trap crop ‘carrot’ the pest population was recorded as 13.48±1.32 on 1st week and then started in decreasing trend from 12.10±1.10 to 03.67±0.52 during 2nd week to 12th week of observation. In wheat as trap crop the population per leaf of onion thrip was counted as 11.20±1.14 on 1st week, it was linearly decreases from 10.30±1.10 to 2.10±0.10 during 2nd week to 12th week of observation. Maximum population of onion thrips (15.94±0.31 per leaf) was recorded on sole crop ‘onion’ followed by trap crop ‘tomato’ (10.28±0.86 per leaf) and carrot (8.09±0.67 per leaf) and the minimum population (6.66±0.92 per leaf) was noted on trap crop ‘wheat’. Statistical analysis of the obtained data indicates that there was significant (p<0.05) difference in population dynamics of onion thrips under different trap crops. It was concluded that the trap crops resulted in significant reduction in onion thrips population on onion. Wheat was the most effective trap crop, followed by carrot and tomato; while in sole onion crop, the insect pest infestation was significantly higher than the plots intercropped with wheat, carrot and tomato.
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