Author(s):

Meenakshi Dwivedi and Karuna Vishunavat

Abstract: A study was conducted to evaluate compatibility of two Trichoderma strains, T. asperellum (Th 14) and T. harzianum (Th 3) and their mutants (6 nos.) with seven common agrochemicals (captan, carbendazim, tebuconazole, imidacloprid, thiamethoxam, glyphosate and quizalofop ethyl) in vitro at two concentrations, i.e. 100 and 250 µg ml^-1. Results revealed that the parent strains were fully compatible (100%) with captan, imidacloprid, thiamethoxam and glyphosate, partially compatible with quizalofop ethyl and incompatible (0%) with carbendazim and tebuconazole, at both concentrations. All the mutants were found incompatible with carbendazim at both the concentrations. But compatibility was induced in mutants Th 3 M1 and Th 3 M6 with tebuconazole at 100 and 250 µg ml^-1(76.1 and 57.8%; 45.9 and 36.2%, respectively) as compared to their incompatible parent strain (Th 3). However, mutants Th 14 M2, Th 3 M2 and Th 3M6 exhibited lower compatibility (89.6, 83.3 and 94.4%, respectively) with captan at 250 µg ml^-1 as compared to their parent strains (Th 14 and Th 3). On the contrary, mutants Th 3 M1 and Th 3 M2 showed enhanced compatibility with quizalofop ethyl at 100 and 250 µg ml^-1 (58.4 and 47.0 %; 58.1 and 37.0%, respectively) as compared to their parent strain (Th 3). These findings indicated that the mutants varied in their interaction with the agrochemicals, yielding higher, similar or lower compatibility as compared to their parent strains. Mutants Th 3 M1 and Th 3 M6 were found most promising exhibiting compatibility with all the test chemicals except carbendazim.

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