Publication

Effect of cool season grazing on lucerne production and aphid populations

Authors
Smallfield, B. M., White, J. G. H., Penman, D. R.
Date
1979
Type
Conference Contribution - published
Collections
Department of Agricultural Sciences
Keywords
grazing management, lucerne, aphids, dry matter yield
Fields of Research
ANZSRC::070308 Crop and Pasture Protection (Pests, Diseases and Weeds), ANZSRC::0703 Crop and Pasture Production
Abstract
In a P-year Wairau lucerne trial, plots were grazed on a 3- or 6- weekly rotation; Half of each plot was hard grazed in June to control overwintering aphids. In the second year a spring/autumn spraying was applied. June grazing reduced aphid populations in spring from 37 to 3 per stem, and gave no significant difference in dry matter yield. Three-weekly spelling, although reducing aphid numbers, halved plant populations and root weight and markedly decreased dry matter yield. In the second year, 6-weekly spelling yielded 13 120 kg/ha, and 3-weekly only 3 540 kg/ha. Spraying of aphids increased yields, but not significantly. The results show that cheap methods of controlling aphids in lucerne can be developed using grazing management.
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https://hdl.handle.net/10182/5097
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Copyright © The Authors and New Zealand Grassland Association.
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