Field Evaluation of Demeton in the Control of Beet Yellows Virus

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Abstract
Differences ill yield and/or per cent sugar were found to be associated with the reduction in numbers of green peach aphids (Myzus persicae (Sulz.)) and delayed incidence of infection of the beet yellows virus in demeton spray-treated plots in three locations in Kern County, California. Populations of aphids were initiated by alatae early in February and were terminated by natural factors during mid-May. Symptoms of virus yellows infection were first found in early April, and spread continued until approximately 100% of the plants were infected. The best available evidence indicated that treatment could delay 100% infection for a period of approximately 3 weeks. With the exception of one field in which generally poor growing conditions prevailed, increased tonnage of beets Vas found in the sprayed plots. Increase in sugar percentage was associated with treatment in all locations.

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