Vol. 16 No. 2
Evaluation of treatment modules for managing scarring beetle, Basilepta subcostatum Jacoby infestation in banana
Author(s): D. MAHALANOBISH, J. HORE AND K. ROY
Abstract: A field experiment was conducted for the evaluation of some treatment modules against banana scarring beetle, Basilepta subcostatum Jacoby in banana cv. Martaman (Musa AAB) during 2017-2018 at the Banana Research Unit, ICAR-AICRP on Fruits, Mondouri, BCKV, Nadia, West Bengal, India. Five treatment modules comprising bioagent, Beauveria bassiana (Bals.- Criv.) Vuill. (1×109 cfu ml-1) as soil drench application @ 1500 ml ha-1 and as bunch spray @ 1500 ml ha-1, chemical insecticides, chlorpyriphos 20EC @ 2000 ml ha-1as soil drench application and acephate 75 SP @ 750 g ha-1 along with APSA 80 (adjuvant) @ 200 ml ha-1as bunch spray, mechanical practice of covering the bunches after insecticidal spray with 17 GSM white polypropylene bunch sleeve and untreated control were replicated four times. The experimental results revealed least number of scar per 20 cm2 leaf area and finger, least fruit injury (%), maximum number of fingers hand-1 and hands bunch-1 as well as maximum fruit yield (t ha-1) in soil application of chlorpyriphos 20EC @ 2000ml ha-1 + bunch spray with acephate 75SP @ 750g ha-1 along with APSA 80 @ 200 ml ha-1 followed by bunch wrapping with white polypropylene sleeve (T1). Soil drenching with B. bassiana @ 1500 ml ha-1 + bunch spray with acephate 75SP @ 750 g ha-1 along with APSA 80 @ 200 ml ha-1 just after first hand opening followed by bunch covering with white polypropylene sleeve and bioagent + mechanical practice module i.e. application of B. bassiana @ 1500 ml ha-1 once as soil drench and other as bunch spray just at the time of flag leaf emergence followed by bunch covering with white polypropylene sleeve were found at par with the chemical insecticides+ mechanical practice module (T1) but superior to insecticidal check (T4) and untreated check when compared based on afore-mentioned variables. Incremental monetary benefit due to treatment execution was maximum in soil application of chlorpyriphos 20EC @ 2000 ml ha-1 + bunch spraying with acephate 75SP @ 750 g ha-1 along with APSA 80 @ 200 ml ha-1 just after first hand opening (T4) and was trailed by the T1, T2 (bioagent + insecticide + mechanical practice module) and T3 (bioagent + mechanical practice module). Considering environmental and human health perspective, bioagent + mechanical practice module could be a promising and economic alternative if bunch sleeves are made available at low cost.
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