Vol. 12 No. 3
Bio-efficacy of Beauveria bassiana (Bals.) Vuillemin against Helicoverpa armigera (Hubn.) infesting tomato in field condition
Author(s): M. DEBNATH, S.K. MANDAL and P. MONDAL
Abstract: Field experiments were conducted to evaluate the efficiency of two commercial formulations (WP and AS) and one local isolate of Beauveria bassiana (Bals.) Vuillemin against Helicoverpa armigera (Hubn.) on tomato for two consecutive years. Three doses of each of the commercial formulations (750,1000, 1250 g ha-1 for WP formulation and 250, 400, 500 ml ha-1 for AS formulation) were tested along with one local isolate (108 conidia perml) and endosulfan (0.07% a.i.). The efficiency of the microbial pesticide was evaluated on the basis of the two years pooled data. Result revealed that three days after the spray endosulfan recorded lowest larval population (1.11 larvae per5 plants). Highest dose of both WP (1.83 larvae per5 plants) and AS (1.56 larvae per5 plants) formulation harboured significantly lower larval population than untreated control (3.17 larvae per5 plants). After seven days of spray all the treated plots had significantly lower larval population (1.00 - 2.44 larvae per5 plants) than untreated control (3.28 larvae per 5 plants). B. bassiana AS @ 500 ml perha produced the highest yield (260.22 q ha-1), followed by endosulfan @ 0.07% a.i. (258.99 q ha-1), B. bassiana WP @ 1250 g ha-1 (252.65 q ha-1) and these three treatments were at par among themselves and produced significantly higher yield than all other treatments and untreated control (200.44 q per ha).
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