Apple scab occurs around the world in all countries where the apple is grown. It occurs primarily on apple, crabapple, and other species of the genus Malus. Apple scab is the most important disease of apple whether or not it is controlled. If the disease is not controlled, large losses in quality and quantity of fruit result, and if the disease is controlled, great expenses in materials, equipment, and labor are incurred. The most severe infestations occur where cool, moist spring weather prevails, whereas light infections occur in irrigated areas with dry, warm summers.
KeywordsSecondary Infection Irrigate Area Warm Summer Young Fruit Apple Scab
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