Show black rot canker common black rot canker in some form Is of common occurrence says the rural new yorker it may be seen in the fall in the black decay of apples and in the spring and summer it shows as spots on the leaves and all the year unless cut cist out it may manifest itself as rough growth on limbs as cankerous eruptions on the branches canker on the limbs has been recognized for many years as an undesired growth cut it out when hen doing the pruning work tills this limb eruption can be connected with the black fruit and leaf spots to show how one follows the other all are due to a parasite called black rot canker and known to orchard doctors as cydon lae |