ISSN:
1365-3059
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
The take-all fungus, Gaeumannomyces graminis var. tritici, was highly sensitive to fluquinconazole (in-vitro EC50 0·016–0·018 mg L−1), a fungicide developed for use as a seed treatment to control take-all, and to prochloraz (EC50 0·006 mg L−1). Fungi of other genera that were commonly isolated from cereal roots were sensitive in varying degrees to prochloraz but were relatively insensitive (e.g. Fusarium culmorum, EC50 〉 20 mg L−1) or slightly sensitive (e.g. Epicoccum purpurascens, EC50 0·514 mg L−1) to fluquinconazole. Gaeumannomyces graminis var. graminis and G. cylindrosporus, weak parasites that can protect roots against take-all, and an unnamed Phialophora sp., all closely related to the take-all fungus, were highly or moderately sensitive to fluquinconazole. Alternaria infectoria and E. purpurascens were most consistently effective in suppressing development of take-all on pot-grown wheat plants dual-inoculated with G. graminis var. tritici and the nonpathogen. Take-all was decreased more on dual-inoculated wheat plants grown from seed treated with fluquinconazole or fluquinconazole plus prochloraz than when only an antagonistic fungus (A. infectoria, E. purpurascens, Fusarium culmorum or Idriella bolleyi) or a seed treatment was applied. These fungi were less effective in combination with seed treatments on barley. Gaeumannomyces graminis var. graminis and G. cylindrosporus, tested on wheat, suppressed take-all only in the absence of fungicides. It is suggested that the performance of seed treatment containing fluquinconazole against take-all may in some circumstances be enhanced by its partial specificity for the take-all fungus.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1046/j.1365-3059.2000.00479.x
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