THE DISTRIBUTION AND ABUNDANCE OF PRATYLENCHUS THORNEI IN FIELDS OF STRAWBERRY CLOVER (TRIFOLIUM FRAGIFERUM) BY G. S. GRANDISON * and H. R. WALLACE Department of Plant Pathology, Waite Agricultural Research Institute, University of Adelaide, Glen Osmond, South Australia 5064 Variation in numbers of Pratylenchus thornei in strawberry clover roots and soil at eight sites within a 30 km radius of Adelaide is closely associated with soil texture ( % clay). Other soil factors appeared to have less influence on nematode numbers. Populations of P. thornei reached a maximum in summer on the clay soils and in winter on the sandy soils. Maximum numbers were greater in the clay than in the sandy soils. The numbers of Pratylenchus thornei Sher & Allen associated with strawberry clover (Trifolium fragiferum L.) is known to vary considerably between different sites in the Adelaide area, but the environmental factors involved in these differences have not been studied. Accordingly, soil texture, available pore space, water holding capacity, soluble salts, N, P, K and pH were determined. Although an initial survey suggested that the large differences in soil texture between the sites might account for most of the variability in nematode numbers it was not
Nematologica – Brill
Published: Jan 1, 1974
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