Effect of some fungicides on mycorrhizae in ground orchids
1997
Nantana Kummuang (Rajamangala Institute of Technology, Chonburi (Thailand). Faculty of Agriculture. Dept. of Plant Science)
Effect of some fungicides on ground orchid mycorrhizae was studied. Six isolates of mycorrhiza Rhizoctonia spp. isolated from roots of nine ground orchids and a parasitic plant growing nearby were tested with ten fungicides (metalaxyl), fosetyl aluminum, captafol, benomyl, mancozeb, carboxin, captan, zineb, pentachloronitrobenzene, and streptomycin), in PDA. The results revealed that benomyl and carboxin gave the highest inhibition of mycelial growth of all isolates. Captan and captafol were less effective than benomyl and carboxin. Captan could inhibit the mycelial growth of Ihm2, Ic, Ihc, Id1 and Id2 while captafol inhibited Ihm1 more effectively. Metalaxyl and fosetyl aluminum resulted in minimal inhibition while streptomycin had no effect.
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