With perennial brome, tall wheat grass, fescue or barley grass in the pasture, the risk of take all carryover is high.
This finding has emerged from research conducted in western and southern NSW by Gordon Murray and Kerry Wratten of NSW Agriculture. The work was supported by growers through the GRDC.
The research trials on perennial pastures found that take-all levels varied from site to site as expected but also varied under different grasses.
The grasses where take-all levels were lowest included wiregrass. birdwood, buffel, lovegrass, danthonia and kangaroo grass, followed by purple pigeon grass, cocksfoot, stipa. phalaris and perennial ryegrass.
Take-all causes annual average cereal losses Australia-wide of $80 million. It survives on the roots and crowns of some pasture plants plus cereals such as wheat, bailey and triticale.
Farmers control the disease by breaking its 'cycle' with non-host crops such as grain legumes and canola, by removing grasses with herbicides, or by long fallows.
Latest research is showing take-all also declines naturally with long-term stubble retention (see story previous page).
The project aims to recommend pastures which can minimise the take-all disease risk in following crops.
North, South, West