வெஜிடோஸ்: ஒரு சர்வதேச தாவர ஆராய்ச்சி இதழ்

Field Experiment on the Assessment of Natural Enemy Population in Different Rice Varieties under Natural and Protected Conditions

Pavviya A and Nalini R

Field Experiment on the Assessment of Natural Enemy Population in Different Rice Varieties under Natural and Protected Conditions

A field experiment was conducted to assess the natural enemy population viz., parasitoids and predators between the natural and protected conditions in different popularly grown rice varieties viz., Seeraga samba, CO 43, ASD 16, BPT 5204 and ADT 37. The mean data of the natural enemies of five different varieties revealed that under natural condition, more number of natural enemies was recorded in the variety ASD 16 (28.00 nos./sweep) followed by BPT 5204 (26.88 nos./sweep), CO 43 (26.55 nos./ sweep), Seeraga samba (25.63 nos./sweep) and ADT 37 (23.23 nos./sweep). In protected condition, the natural enemy population was less compared to the natural condition. The variety, ASD 16 harboured more number of natural enemies of 21.45 number/sweep followed by BPT 5204 (21.28 nos./sweep), CO 43 (21.05 nos./ sweep), Seeraga samba (19.63 nos./sweep) and ADT 37 (19.05 nos./sweep) in protected condition. During the second fortnight of February 2015, the maximum number of natural enemies was recorded to the tune of 156.9 nos./sweep and 127.3 nos./sweep in both the conditions. Minimum number of 107.4 nos./sweep and 81.5 nos./sweep was recorded during first fortnight of January 2015 under natural condition and protected conditions respectively...