Hardy, attractive Cleveland pear trees grow well in a variety of climates. However, if the leaves of a Cleveland pear have turned brown, the tree has a serious health problem. Brown leaves often indicate an issue that will prevent the tree from producing blossoms.
The amount of light a Cleveland pear receives is key to its health. Although improper sunlight alone may not cause the leaves of the tree to become brown, a lack of light weakens the tree and makes it more susceptible to other problems, increasing the likelihood of diseases and pests that cause brown leaves. Plant the Cleveland pear tree in an area where it receives full to partial sunlight throughout the day to keep it healthy.
Fire blight is a bacterial disease that thrives in areas with high humidity and hot temperatures. Cleveland pears are most likely to contract the disease after a long period of heavy rain followed by warm, humid temperatures; trees grown in standing water are also at risk of contracting fire blight. Fire blight is often fatal to a Cleveland pear tree, but pruning infected branches in the late fall and clearing away dead leaves helps limit the spread of the disease.
A period of severe drought can cause the leaves of a Cleveland pear tree to become brown and dehydrated. Water the tree at least once a week to keep it healthy and growing during droughts. If given these waterings, Cleveland pears recover well from drought conditions. Dried-out leaves will eventually be replaced or restored to health as the Cleveland pear tree receives an adequate amount of water. Avoid over-watering the pear tree, as excess water promotes fungal and bacterial problems.
Aphids are a serious problem for pear trees, as they feed directly on the leaves, depriving them of nutrients and turning them brown. These pest insects often carry diseases with them, which can further damage the Cleveland pear tree. Apply pesticides to the tree (following packaging instructions) when aphids are noticed on it, to prevent them from ruining the tree's leaves.
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