Keep down weeds iii. Cool the soil iv. Main crop -Harvest once the vines have died 3. Usually occur in warm humid weather ii. First signs are dark brown patches on some of the leaves iii.
Early potatoes are less likely to be effected than main season iv.
Bourdeaux mixture and other fungicides are available b. Surface of the tuber becomes brown and cracked ii. Do not save last year's tubers for use as seed pieces ii. Use virus-free seed pieces iii. Are generally spread by aphids iv.