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Biocontrol potential of fungal antagonists gliocladium virens and trichoderma longibrachiatum


, : Biocontrol potential of fungal antagonists gliocladium virens and trichoderma longibrachiatum. Zeitschrift fuer Pflanzenkrankheiten und Pflanzenschutz 97(6): 570-579

The efficacy of Gliocladium virens (G 1 and G 2) and Trichoderma longibrachiatum (T 1 and T 2) as biocontrol agents of economically important soil-borne plant pathogens Rhizoctonia solani, Sclerotium rolfsii and Pythium aphanidermatum has been investigated. The antagonists-delivered to soil as wheat bran-saw dust (WBSD) preparation-were able to gradually establish despite the initial decline in their population. Consequently, the survivability of the pathogens was adversely affected to varying degrees resulting in different levels of protection against various systems. Seed coating with spore suspension also gave considerable control against the test pathogens, but was less effective when compared to soil application of the antagonists. The G. virens isolate G 1 yielded remarkable protection against groundnut root rot (74.4%), cotton (66.4%) and tomato (58.4%) damping-off but only moderately reduced (36%) the groundnut stem rot incidence, whereas G 2 was much less effective. Of the two T. longibrachiatum isolates, T 1 was more potent against groundnut root rot (65.6%) while against tomato damping-off, T 2 conferred greater protection (49.2%). The results are discussed in relation to the mechanisms underlying the antagonistic and biocontrol potential of G. virens and T. longibrachiatum.

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