Bioefficacy of Metarhizium anisopliae isolates against teak skeletoniser Paliga machoeralis (Lepidoptera: Pyralidae).

Sapna Bai, N and Remadevi, OK and Sasidharan, TO and Balachander, M and Dharma Rajan, Priyadarsanan (2013) Bioefficacy of Metarhizium anisopliae isolates against teak skeletoniser Paliga machoeralis (Lepidoptera: Pyralidae). Journal of Tropical Forest Science, 25 (3). pp. 310-316. ISSN 0128-1283

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Abstract

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 103-108 conidia ml-1. The dose-mortality and time-dose-mortality responses for these isolates were determined. Median lethal dose concentration (LC50) values of isolates ranged from 0.11 × 105 to 3417.65 × 105 conidia ml-1. Among the 25 isolates, MIS2, MIS7, MIS1 and MIS3 were found to be more effective with lower LC50 values. MIS2 was the most effective isolate with lowest LC50 (0.11 × 105 conidia ml-1) followed by MIS7 (0.15 × 105 conidia ml-1). Lowest median lethal time (LT50) 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 7 conidia ml-1. With respect to LC50 and LT50, 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.

Item Type: Article
Additional Information: Copyright of this article belongs to Forest Research Institute Malaysia
Uncontrolled Keywords: Tectona grandis, entomopathogenic fungi, biological control, pathogenicity, pest
Subjects: C Publications by ATREEians > G Journal Papers
Divisions: Publications by ATREEians > Journal Papers
Depositing User: Users 103 not found.
Date Deposited: 05 Dec 2016 09:33
Last Modified: 05 Dec 2016 09:33
URI: http://eprints.atree.org/id/eprint/334

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