Abstract
The effects of inoculation withVerticillium nubilum have been investigated using three categories of sprout length produced by various chitting treatments of Arran Pilot tubers. The tubers were planted in a field of coarse sandy loam with the tips 102 mm below the surface. Increasing incidence and intensity of coiling symptoms were associated with increasing sprout length. Inoculation withV. nubilum appears to increase the amount of coiling of short- and medium-length sprouts. Following harvestingV. nubilum was not isolated from cultures of subterranean stem segments taken from plants of all treatments. It is concluded thatV. nubilum is not the prime agent in causing coiled sprouts in the field.
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