Show black knot treatment in plums and cherries the only effective treatment for black knot in plum and cherry trees Is to cut out and carefully burn all the knots destroy entirely any trees that are badly infested tills this disease spreads so rapidly that quick work la Is needed to save clenn clean trees it la Is believed that a fungicidal spray like lime sulphur or bordeaux at dormant streng strength tl before growth starts is a safeguard for the clean trees but th the 0 knots themselves must be burned and careful watch kept during the season to catch any just starting when handling these knots use canvas gloves and do not touch the knots or gloves on clean parts of the tree |