Comparative Effectiveness of Egg and Larval Stages of Chrysoperla Carnea against Sucking Insect Pests of Cotton Crop
Abstract
To determine the comparative effectiveness of egg and larval stages of Chrysoperla carnea against sucking insect pests of cotton crop this study was designed. . The study was conducted on the local cotton variety i-e SADORI during 2014. The experiment was designed in Randomized Complete Block Design (RCBD) with 03 treatments and 04 replication. The study indicated that the maximum infestation of Amrasca bigutulla bigutulla (2.75±0.26a) Thrip tabaci (13.06±0.19a) and Bemisia tabaci (7.17±0.30a) on cotton field were observed when crop was in the pre-treatment observation, whereas, after releasing of bio-control agent (Chrysoperla carnea larvae) in fields it was observed that the minimum infestation of Amrasca bigutulla bigutulla (0.49±0.22c), Thrip tabaci (5.40±1.29c), Bemisia tabaci (1.33±1.18c) and the maximum predator population of Chrysoperla carnea (1.47±0.17a) in the month of July. Further, in the month of August the minimum monthly mean infestation of Amrasca bigutulla bigutulla (0.42±0.25c), Thrip tabaci (4.32±1.31c) and Bemisia tabaci (1.55±1.2c) were recorded and the maximum predator population of Chrysoperla carnea (1.85±0.13a) were also observed. Similarly, the result also revealed that the maximum predator population of Chrysoperla carnea (1.79±0.18a) and minimum monthly mean infestation of Amrasca bigutulla bigutulla (0.14±0.15c) Thrip tabaci (1.33±0.74c) and Bemisia tabaci (0.58±0.45c) were recorded in the month of September.
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