Changes in Population of different predators in Cotton agro ecosystem under Punjab Conditions in different years
Last Updated On: 09/01/2012
| Parasitoids | Population/ 5 plants ( mean ± S.D) |
| | 1975 | 1985 | 1995 |
| Predatory bugs | 1.07 ± 0.68 | 0.81 ± 0.74 ( 24.29) | 0.22 ± 0.42( 79.43) |
| Chrysoperla sp. | 1.19 ± 1.08 | 0.96 ± 0.98 (19.32) | 0.56 ± 0.64 (52.94) |
| Coccinellids | 1.04 ± 0.96 | 0.81 ± 0.74( 22.11) | 0.33 ± 0.48 (68.26) |
| Spiders | 1.78 ± 1.58 | 1.41 ± 0.89( 20.78) | 0.52 ± 0.58 (70.78) |
| Misc. | 0.41 ± 0.64 | 0.37 ± 0.56 ( 9.75) | 0.26 ± 0.53 (36.58) |
| Total | 5.46 ± 2.80 | 4.41 ± 1.93 ( 19.23) | 1.07 ± 1.03( 68.36) |
*Figures in parenthesis are reduction in population over base year
Source: Dhawan A.K., Major pests of cotton and their integrated management, Updadhyay R.K, Mukerji K.G., Rajak (eds), IPM system in agriculture vol. 6 : cash crops, Aditya Books private limited, New Delhi. pp. 165-225