Phytopathology (1996) 86, p. S52 (Zibra et al.)

N. Zibra and D.E. Mathre (1996)
Suppression of Gaeumannomyces graminis var. tritici by a Phialophora sp. and a Bacillus sp.
Phytopathology 86 (11 suppl.), S52-S52
Abstract: A Bacillus sp. and a Phialophora sp., both isolated from a soil suppressive to take-all in Montana (Larslan soil), were tested separately and in combination for their ability to suppress Gaeumannomyces graminis var. tritici (Ggt). On artificial media, both antagonists showed an antibiotic activity resulting in a statistically significant inhibition of Ggt growth. A greenhouse pot experiment was conducted twice using natural and sterilized Larslan soil (120 C for 60 min on three consecutive days). The Bacillus sp. was introduced as a seed coating (10⁷-10⁸ cfu/kernel) whereas Phialophora sp. was grown on autoclaved canola seed and mixed with soil at a rate of 9% (w/w). Greater suppression of the disease occurred with Phialophora sp. alone or combined with Bacillus sp. than with Bacillus sp. alone. Nevertheless, plants from Bacillus-coated seed had less disease and more shoot weight than the Ggt-infested control plants. The Bacillus sp. gave an early protection of the seedlings (up to 10-15 days), however, suppression of the disease by Phialophora sp. lasted longer (up to 65 days). This result suggests the potential of using such a combination to ensure an extended and perhaps complementary protection of the wheat plants against Ggt infection.

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
evaluation - screening - selection

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Gaeumannomyces graminis