Comparison of the performance of subterranean clover [Trifolium subterraneum] cultivars in southern New South Wales, 2. Effects of Phytophthora clandestina and bromoxynil [herbicide] on seedling survival, growth, and seed set
1993
Dear, B.S. | Murray, G.M. (New South Wales Agriculture, Wagga Wagga (Australia). Agricultural Research Inst.) | Cregan, P.D. (Charles Sturt Univ., Wagga Wagga (Australia). School of Agriculture) | Taylor, P.A. (ICI Crop Care, Ascot Vale (Australia). Merrindale Research Centre)
Effects of Phytophthora root disease on 14 cultivars of subterranean clover following application of bromoxynil were evaluated. Seedling death over autumn-winter ranged from 22 percent in Trikkala, the most resistant cultivar, to 96 percent in Woogenellup, the most susceptible. Compared with previous years (1984-85), herbage yields and seed set of the most susceptible cultivars were depressed. Later maturing cultivars appeared to recover from the disease and set more seed than earlier maturing cultivars. Field susceptibility was similar to glasshouse phytophthora ratings for most cultivars; however, Trikkala, Karridale, and Enfield were more affected in the field following herbicide application than expected from the glasshouse reaction. Trikkala, Junee, and Dalkeith were the cultivars most tolerant in the field to root rot, while Woogenellup, Northam, and Nungarin were the most severely affected. Leaf damage following herbicide application was greatest in cultivars showing the most severe root lesions and having the highest susceptibility to P. clandestina in a glasshouse test. P. clandestina reduced the productivity of susceptible subterranean clover cultivars and has the potential to reduce long-term persistence by reducing seed set.
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