Knowledgebase
Brown spots on Nanking Cherry shrub leaves #764024
Asked July 26, 2021, 3:07 PM EDT
Hubbard County Minnesota
Expert Response
Shrub cherries have the same insects and disease problems as cherry trees. Newly planted trees and shrubs need regular and consistent watering to establish a new root systems. Water your new cherry shrubs often during this hot, dry spell. The shrub has to grow a new root system to replace the water lost by their leaves. For the first 3-12 weeks after planting, water every 2 to 3 days. After 12 weeks, water weekly until roots are established. It can take two years for the new root to become established. Stressed plants are more likely to get diseases and insect problems. By the end of July, cherry shrubs stop forming new leaves. Cherry leaf spots are first purple but eventually turn brown. The center of the spot may fall out and leave small holes in the leaf. Leaves with many leaf spots turn yellow and fall off the tree. Cherry leaf spot fungi, Blumeriella jaapii, overwinter in infected leaves that have fallen to the ground. Rake up and compost fallen cherry leaves to reduce leaf spot next year. Next spring two weeks after they bloom fungicides can be used to protect leaves.
Shrub cherries have the same insects and disease problems as cherry trees. Newly planted trees and shrubs need regular and consistent watering to establish a new root systems. Water your new cherry shrubs often during this hot, dry spell. The shrub has to grow a new root system to replace the water lost by their leaves. For the first 3-12 weeks after planting, water every 2 to 3 days. After 12 weeks, water weekly until roots are established. It can take two year for root to become established. Stressed plants are more likely to get diseases. By the end of July, cherry trees stop forming new leaves. Cherry leaf spots are first purple but eventually turn brown. The center of the spot may fall out and leave small holes in the leaf. Leaves with many leaf spots turn yellow and fall off the tree. Cherry leaf spot fungi, Blumeriella jaapii, overwinter in infected leaves that have fallen to the ground. Rake up and compost fallen cherry leaves in September or October to reduce leaf spot next year. Next spring two weeks after they bloom fungicides can be used to protect leaves.
