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| Investigations on Interaction between Insect Pests and Predators of Cauliflower |
Imran Ali Jatoi, Syed Shahzad ali bukhari, Farman ali, Mitha khan, Niaz Ahmed Jamali,Abdul Nabi , Mukhtiar Ahmed Rind, Muhammad Sharif, Abdul Jabbar, Shah Muhammad khosa
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Abstract:
The present study was conducted on investigations on interaction between insect pests and predators of cauliflower in the field of Tajpur, Tando Allahyar, during winter season of 2013. Homogenous seedlings of cauliflower were planted in a Randomized Complete Block Design with three replicates plots. The results revealed that four insect pests i.e., whiteflies, thrips, aphids and cutworms were found infesting cauliflower, however, the population of insect pests was significantly different between the dates of observation. Similarly three predator species i.e., zigzag beetles, 7- spotted beetles and 11- spotted beetles were recorded preying on insect pests of cauliflower, the differences in the population of predators among the observation dates was highly significant. It was observed that the population of thrip was maximum (36.21 ± 3.92/leaf) and whiteflies (26.48± 2.20/leaf) on 2nd March, 2013 while aphids reached to its peak (45.30± 1.00/leaf) on 23rd, February, 2013 and cutworms (8.38± 1.55) on 9th March, 2013. The predator zigzag beetles reached to their peak population (2.46 ± 0.31/leaf) on 2nd February, 2013.While 7- spotted beetles (3.15 ± 0.05/leaf) and 11- spotted beetles (2.00 ± 0.23/leaf) reached to their peak on 9th February, 2013. The correlations among the predators such as zigzag beetle,7- spotted beetle and 11- spotted beetle, were non-significant positively associated with white fly (r =0.281 NS), (r = 0.231NS), (r = 0.138 NS), aphids ( r =0.235 NS), (r =0.147NS), (r = 0.274 NS) and thrip ( r =0.171 NS), (r =0.181NS), (r = 0.067 NS) respectively
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