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New Zealand Plant Protection 64 (2011): 175-182

Wheat volunteers in Lolium perenne - effects on Gaeumannomyces graminis var. tritici carry-over and take-all

S.L. Bithell, R.C. Butler, A. McKay and M.G. Cromey

ABSTRACT

Crop rotations can be used to manage the build-up of inoculum of Gaeumannomyces graminis var. tritici (Ggt), an important pathogen that causes take-all in wheat crops. This study investigated whether the value of a perennial ryegrass (Lolium perenne) break crop is impaired by the presence of wheat volunteers. Soil Ggt concentrations after perennial ryegrass without wheat volunteers were approximately 20% of those with wheat, but perennial ryegrass was less effective than fallow at reducing soil Ggt. Wheat volunteers reduced the value of a perennial ryegrass break when they were present at densities of 40 volunteers/m2; below this density soil Ggt concentrations and take-all incidence levels were similar to the perennial ryegrass only treatment. After the volunteer season, under low volunteer densities (1-15 plants/m2) Ggt concentrations declined to below the detection level (< 5 pg DNA) within 1 year.

Related articles
pdfEvaluation of the susceptibility of various grass species to Gaeumannomyces graminis var. tritici
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New Zealand Plant Protection 58: 261-267

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