Abstract
Yield of sugar beet seed was reduced by virus yellows, curly top, and also from plants affected by both yellows and curly top. Germination of seeds from plants with yellows was reduced in one of four tests, but no reduction was attributable to curly top alone. Curly top and yellows together caused significant reductions in seed germination in two of three tests. In field plots, plants in various stages of development were inoculated with green peach aphids ( Myzus, persicae (Sulz.)) carrying the yellows virus. Reductions in yield occurred in all yellows plots; early infections caused greater reductions than later infections. Reductions in germination resulted from inoculations of plants in the bloom stage and in the early spring.
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