DISEASES WHICH NORMALLY ATTACK ONE OR TWO KINDS OF PLANTS ONLY
Brown powdery appearance on leaf under-surface. Spray with colloidal cop-per after picking (or before on young stocks). Alternate host is five-needled pines.
Branches die back and wither when near fruit harvest due to botrytis infection through wound or dead side shoot. Cut off behind point of infection and paint over cuts with a protective paint.
Spray in January with Bordeaux mixture, or 3 per cent lime sulphur.
White coating on shoot tips. Cut these off and spray with Karathane.
Fruit turns brown and develops white pustules. Cut out dead spurs and shoots when pruning. Bury deeply all rotten fruits. Keep the store clean and do not store bruised fruit. Pick and store when dry and wrap better-class fruits in special wrappers. Try to prevent injuries from wasps and birds. Control codling moth.
Scrape and cut out cankers, and paint cuts with a good paint.
On fruits should be checked by spraying with captan early in season.
Mosaic shows as yellow blotches or spots and crinkling of leaves. Some varieties are only slightly affected and may still bear fruit. If crippled they must be discarded.