A continuous supply of an adequate amount of moisture via timely rainfall or irrigation is crucial for
maximizing yields and quality of seed potatoes. Adequate moisture at tuber set is particularly important as
it encourages setting of a large number of tubers and controls or reduces the severity of common scab.
Over-irrigation increases susceptibility to late blight, blackleg, powdery scab and tuber rots. The wheels on
wheel-move and centre pivot irrigation systems may contribute to the transmission of some viral or
bacterial diseases within the field.