Improving the tolerance of Metarhizium anisopliae metschinikoff to selected insecticides
| Autor: | K. Sudharma, Malini Nilamudeen |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Journal of Entomological Research. 45:186-192 |
| ISSN: | 0974-4576 0378-9519 |
| Popis: | The growth of selected cultures of M. anisopliae (SM-chlorantraniliprole, SM-acephate and SM-thiamethoxam) increased to the extent of 72.87, 71.67 and 54.15%, respectively while that of the relaxed (RM-chlorantraniliprole, RM-thiamethoxam and RM-acephate) and untreated cultures showed 14.04, 15.64 and 17.03 and 18.76% reduction in growth, respectively. SM-acephate SM-thiamethoxam and SM-chlorantraniliprole showed an increase in spore count to the extent of 9.77, 2.00 and 1.17%, respectively while the relaxed cultures, RM-thiamethoxam RM-chlorantraniliprole RM-acephate and untreated (UM) showed reduction to the tune of 99.52, 99.53 and 99.54 and 99.80%, respectively. After ten passages through poisoned/unpoisoned media, reduction in bioefficacy of M. anisopliae was seen for all the cultures, i.e., selected, relaxed and untreated but the reduction was very less in selected cultures compared to that of the relaxed and untreated. The reduction in bioefficacy of SM-chlorantraniliprole, SM-acephate and SM-thiamethoxam was only 4.36, 8.34 and 8.70% and it was 49.99, 56.53 and 63.63% in RM-acephate, RM-chlorantraniliprole and RM-thiamethoxam. The bioefficacy of untreated M. anisopliae declined to the extent of 69.23%. Only selected cultures of M. anisopliae could grow in media containing doses of insecticides higher than the maximum tolerable dose i.e., 4.5 x for acephate and 8.5 x for both chlorantraniliprole and thiamethoxam,in these higher concentrations while there was no growth for relaxed and untreated cultures in media containing higher concentrations of these insecticides. |
| Databáze: | OpenAIRE |
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