Abstract
Methods Monthly disease surveys were conducted in sugarbeet fields throughout the Salt River Valley in central Arizona from November through June of 1965-66, 1966-67 and 1967-68. Six experimental strip-fields were included the first year and 30 com mercial fields were surveyed in each of the latter two seasons. In each experimental field, an area of approximately 4300 ft2 was selected for plant-by-plant disease counts. Virus incidence in commercial fields was assessed by counting diseased plants in 20 samples of 50 plants each, situated at equal intervals along two random diagonals of the fields. 1\ew diagonals were traversed each month. Data included the monthly incidence of yellows (beet and western), curly top, beet mosaic, cucumber mosaic, yellow vein and rosette virus diseases . All fields were planted with Spreckels' Sugar Company's curly-top resistant variety S
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