AUTHOR(S)
Sitesh Chatterjee1 and Palash Mondal2

ABSTRACT

The experimentswere carried out to study the performance of some biorational insecticidesagainst yellow stem borer, Scirpophaga incertulas Walker in Boro riceat Rice Research Station, Chinsurah, Hooghly, West Bengal during the year2009-10, 2010-11 and 2011-12. Nine treatments viz. Beauveria bassiana (PantherBB) @ 4 g/l, Beauveria bassiana ( Myco- Jaal) @ 4 ml/l, Metarhiziumanisopliae (Nodule Testing Laboratory, BCKV) @ 2 g/l, Bacillusthuringiensis(Panther BT) @ 1.5 g/l, Bacillus thuringiensis(NoduleTesting Laboratory, BCKV) @ 1.5 g/l, Azadirachtin 10,000 ppm @ 1 ml/l, Spinosad45%SC @ 2 ml/15 l, Phosphamidon 40% EC @ 1.5ml/l of water and untreated control(Water Spray) were laid out in randomized block design with three replications.The observations on per cent of dead heart and white ear head along with yieldof the crop in different treatments were recorded. Spinosad 45%SC proved mosteffective in managing the insect population as lowest DH% and WE% were observedin all the crop growing seasons. Result on pooled analyses revealed that 80.27%and 67.10% reduction of dead heart and white ear head were achieved over the controlby two sprayings of Spinosad 45%SC which resulted in 69.96% increase of yieldover the control. Apart from Spinosad 45%SC, Phosphamidon 40% EC also provedbetter in reducing the dead heart and white ear head as well as in per centincrease of yield over the control.

DOI
https://doi.org/10.57182/jbiopestic.7.0.143-147

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