Vol. 7, Issue 5 (2019)
Effect of two microbial insecticides against the cabbage butterfly Pieris brassicae Linnaeus under cabbage crop agro-ecosystem of Manipur valley
Author(s): Maryir Basar and KH Ibohal Singh
Abstract: The field experiments were conducted at the College of Agriculture, Iroishemba, Imphal during Rabi seasons of 2016-17 and 2017-18 to study the bio-efficacy of two microbial insecticides each at three doses against the Cabbage butterfly (CB), Pieris brassicae Linnaeus and their effect on the yield of cabbage crop var. “Green Heroâ€. There was high incidence of P. brassicae in the experimental crop variety. The insect maintained mean incidence of 65.33 to 69.40 per cent leaf damage. Thus, this pest was considered as the regular and major pest among the various species of butterfly observed in cabbage during the investigation. The results on the efficacy of microbial insecticides each at three doses against P. brassicae revealed that all the insecticidal treatments resulted in significantly suppression of the pest incidence in both the experimental years. The pooled mean data of two years based on three applications of insecticide indicated that Green pacer (Metarhizium anisopliae) @ 1500 g/ha proved the most effective treatment in reducing the incidence of the pest registering the minimum mean leaf damage of 49.93 per cent as against 67.57 per cent in untreated control followed by Mycojaal (Beauveria bassiana) 10 SC @ 1000 ml/ha and Green pacer (M. anisopliae) @ 1000 g/ha with a record of lower mean leaf damage of 51.68 and 51.85 per cent, respectively and did not differ significantly between them.
Pages: 176-178 | 523 Views 66 Downloads
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How to cite this article:
Maryir Basar, KH Ibohal Singh. Effect of two microbial insecticides against the cabbage butterfly Pieris brassicae Linnaeus under cabbage crop agro-ecosystem of Manipur valley. Int J Chem Stud 2019;7(5):176-178.
