BIOEFFICACY OF METARHIZIUM ANISOPLIAE ISOLATES AGAINST TEAK SKELETONISER PALIGA MACHOERALIS (LEPIDOPTERA: PYRALIDAE)/Bioefikasi Metarhizium anisopliae menentang ulat perangka daun jati Paliga machoeralis (Lepidoptera: Pyralidae)

Bioefficacy of Metarhizium anisopKae isolates against teak skeletoniser Paliga machoeralis (Lepidoptera: Pyralidae). Paliga machoeralis is the most malicious pest of teak responsible for epidemic defoliation of trees in plantations and natural forests. Metarhizium spp. have been a long standing mode...

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Bibliographic Details
Published in:Journal of tropical forest science 2013-07, Vol.25 (3), p.310
Main Authors: Sapna-Bai, N, Remadevi, O K, Sasidharan, T O, Balachander, M, Dharmarajan, P
Format: Article
Language:English
Subjects:
Bioassays
Eggs
Forests
Industrial development
Insects
Leaves
Microbiology
Plantations
Studies
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Summary:Bioefficacy of Metarhizium anisopKae isolates against teak skeletoniser Paliga machoeralis (Lepidoptera: Pyralidae). Paliga machoeralis is the most malicious pest of teak responsible for epidemic defoliation of trees in plantations and natural forests. Metarhizium spp. have been a long standing model for biological control reported to have great potential for the management of over 200 insect species. The present study was conducted to evaluate the virulence of M. anisopliae isolates against P. machoeralis in the laboratory. Bioassay of 25 isolates of M. anisopliae was carried out using inoculum concentrations ranging from 10^sup 3^-10^sup 8^ conidia ml^sup -1^. The dose-mortality and time-dose-mortality responses for these isolates were determined. Median lethal dose concentration (LC^sub 50^) values of isolates ranged from 0.11 × 10^sup 5^ to 3417.65 × 10^sup 5^ conidia ml^sup -1^. Among the 25 isolates, MIS2, MIS7, MIS1 and MIS3 were found to be more effective with lower LC^sub 50^ values. MIS2 was the most effective isolate with lowest LC^sub 50^ (0.11 × 10^sup 5^ conidia ml^sup -1^) followed by MIS7 (0.15 × 10^sup 5^ conidia ml^sup -1^). Lowest median lethal time (LT^sub 50^) of 3.4 days was also recorded for MIS2 followed by MIS7 (3.7 days), MIS1 (4.3 days) and MIS3 (4.9 days) at spore load of 10^sup 7^ conidia ml^sup -1^. With respect to LC^sub 50^ and LT^sub 50^, MIS2 proved to be superior over other isolates. The results indicate prospects of isolates MIS2 and MIS7 in developing biopesticide formulation for management of teak skeletoniser. [PUBLICATION ABSTRACT]
ISSN:0128-1283
2521-9847