STUDIES ON ENTOMOGENOUS FUNGI FOR THE MANAGEMENT OF BROWN PLANTHOPPER, Nilaparvata lugens (Stal.)
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Date
23-08-2013
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Abstract
Investigations on entomogenous fungi were carried out during
2012-13 at ZARS, VC farm, Mandya. Survey on the incidence of
Metarhizium anisopliae on brown planthopper, Nilaparvata lugens ranged
between 0.1 to 0.5 % in the diverse rice fields surveyed. Pathogenicity of
different isolates of fungal pathogens on brown planthopper nymphs and
adults in the laboratory revealed highest nymphal mortality of 8.89 %
and 53.33 % in M. anisopliae isolate viz., Ma-1, Ma-4 and Ma-1
respectively. The highest per cent mortality of adult was recorded in M.
anisopliae (Ma-4) at two (17.78 %) and ten days (88.89 %) after spraying.
In field condition highest BPH mortality was recorded in M. anisopliae
(Ma-4) at three (16.67 %) and twenty-one days (86.67 %) after spraying.
The local isolate, Ma-4 was significantly superior and more virulent over
rest of the isolates under laboratory and field condition. Thirteen
insecticides and six fungicides used in the management of insect pests
and diseases of paddy were tested for their compatibility with M.
anisopliae and Beauveria bassiana, and none of them were found to be
compatible with entomogenous fungi.
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