Biosecurity, pests, weeds and diseases, Grains and field crops
Clover scorch: In spite of poor seasonal conditions, adequate levels of clover scorch developed in the test plots to readily identify susceptible clovers. Of the 333 introductions tested, 23% scored 3.0 or less indicating a high level of resistance. Bluegreen aphid screening: Two hundred and twenty four randomly selected subterranean clovers from all Western Mediterranean collections were tested for resistance to BGA in Nov/Dec of 1983. The susceptibility of annual legumes to Bluegreen aphid. Red legged earth mite screening: Results of two preliminary experiments to develop techniques for mass screening for RLEM resistance in subterranean clover were reported last year. Evaluation of Medicago murex: Seven small plot experiments were established in 1983 and results for that year have been reported previously. Regeneration density, nodulation, spring composition and seed yields were also recorded on these sites in 1984. Yields are shown in Table 2. The average yield of each site was different due to differences in grazing intensity, moisture stress during spring, and the presence of other species. Adjustments to the yields were made (as shown in the Table) and an average corrected yield for each variety was then calculated.
Number of Pages
Gillespie, D J. (1984), Clover, Bluegreen aphid and Red legged mite screening, Medicago murex evaluation. Department of Agriculture and Food, Western Australia, Perth. Report.