Yellow wilt of sugar beet

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Abstract
Yellow wilt, "marchitez virosa", 1st identified as a virus disease in 1941, has restricted sugarbeet production in Chile to the southern 3rd of the country where conditions are unfavorable for increase of the vector, Paratanus exitiosus. The disease is known only in Chile and Argentina where it seems to be endemic in a number of desert plants and occurs on a number of weeds. It infects all members cf Chenopodiaceae thus far tested, including sugarbeet, table beet, Swiss chard, and spinach. It is capable of total destruction of susceptible crop plants. The vector, P. exitiosus, breeds readily on sugarbeet and a number of desert plants and common weeds. The virus persists in the vector but apparently does not pass through the egg stage. The incubation period of the virus in the vector is about 20 days and in the plant probably more than 20 days. Of some 300 sugar beet selections tested, none has shown appreciable resistance. No control measures are known for areas where the disease is prevalent.

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