Manipulation of ley pastures with herbicides to control take-all [wheat; Gaeumannomyces graminis; Western Australia]
1993
MacLeod, W.J. | Thorn, C.W. (Western Australian Dept. of Agriculture, Geraldton. Geraldton Regional Office) | MacNish, G.C. (Western Australian Dept. of Agriculture, Esperance. Esperance Agricultural Centre)
The effect of grass-selective and broad-spectrum herbicides in pasture-wheat rotation experiments were studied from 1981 to 1986 at Esperance, W.A. Herbicide treatments greatly decreased the grass content of pastures in the year of application, and this effect carried over to the second year in a 2 year pasture - 1 year crop rotation. Herbicide reduced total pasture yield in the year of application, but not in the year following. Herbicide treatment of pastures decreased the incidence and severity of take-all in the following wheat crop. Crop yields were increased following treated pastures and to a greater extent than could be explained by decreased take-all alone. Incidence of take-all depended primarily upon the quantity of grass in the previous pasture (5.4 percent incidence of take-all per 100 kg per ha grass dry matter in the previous pasture). Incidence of take-all was also related to the incidence of take-all in previous wheat crops and the quantity of grass in the pasture in the preceding 2 years.
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