If you do wish to control rust on pears, fungicides must be sprayed in April or May, when the fungus is active. Both efforts help the tree to put on a new flush of growth for the year.Īriel Whitely-Noll, horticulture agent for Shawnee County Research and Extension.įor juniper and pear, damage is only aesthetic and control is optional. Fruits of affected trees should be thinned significantly, and the tree should be fertilized in accordance with a soil test. Trees already affected this year may lose a substantial amount of leaves. Be sure to cover the entire tree, including the bark and trunk. Plum pocket results in formation of distorted, light green, bladder-shaped fruit.Īlthough these diseases become visible on our peach trees in the spring, the treatment window is fall, after leaf drop through early spring, before bud swell.Īn effective fungicide is chlorothalonil (Bravo, Daconil, Fertilome Broad-Spectrum Fungicide, Ortho Garden Disease Control and others). Peach Leaf Curl is a fungal disease that causes developing peach leaves to become puckered and distorted and show a reddish-green hue.Ī similar disease called plum pocket may develop on American and sand hill plums. Give your tree time to recover on its own, no treatment necessary. Fungicides, often thought to cure anthracnose, do nothing. After a few weeks, the tree will leaf out again with no long-term effects on the tree’s health. In 2017, anthracnose was so severe on our sycamore trees that many homeowners reported trees that lost all their leaves.įortunately, these trees will make a complete recovery. Leaves dropping from the tree is common, and at a glance these leaves may appear to be completely healthy (no brown or black spots) as the petiole of the leaf is sometimes the only affected part. Younger leaves may turn black and wither while older leaves have brown areas following the major veins of the leaf. AnthracnoseĪnthracnose is a fungal disease favored by cool, wet weather that can affect sycamore, oak, maple and many other shade trees. Knowing the signs of common tree diseases can help you determine whether your help is needed or if the tree can manage the disease on its own. While moist weather can create conditions for diseases on many plants, sick trees in the landscape tend to draw our attention. Our often-wet springs bring with them the perfect conditions for many plant diseases. Cedar apple rust begins its seasonal cycle on cedar trees and is one of many diseases attacking apples, but not all apple varieties are susceptible. Cedar apple rust infection on cedar in New Paltz, N.Y.
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