Their worm-like grubs feed on the undersides of willow leaves, leaving only a network of veins. Crown Gall – Willow trees are at risk for crown gall, a bacterium that causes galls to form on the roots and stems. Because the list is so long, I have omitted the details for those insects and diseases often covered in other tree descriptions. Break in StormsWeak Wood - Willows have weak, brittle wood. June 2018 in Problem solving. Foliar Diseases. Its branches or roots sometimes die. If your willows have yellow or red patches on the tree trunk, this may be the result of sunscald. Yellowish Spots … Powdery Mildew – The ends of twigs, leaves, and blossoms covered with white to pearly-gray velvety mold, indicate Willow trees are infected with powdery mildew. Yellowish Spots and Dark Pustules on Leaf UndersidesRust -Some rust diseases that are caused by fungi attack willow leaves. They should only be planted in Hardiness Zones 4-10. Mature larvae are covered with black hairs and have 5 pairs of blue spots, 6 pairs of red spots along the back, and voracious appetites. Powdery Mildew – The ends of twigs, leaves, and blossoms covered with white to pearly-gray velvety mold, indicate Willow trees are infected with powdery mildew. Holes In LeavesCaterpillars - Caterpillars come in lots of sizes and colors since they are the larvae of many different kinds of moth. Weeping willow is susceptible to a long list of pests, including the willow and poplar borer, … They may have sawdust around the entrance. It is imperative to consider the size of a willow... 2. The tree may be defoliated. Leaves DiscoloredThrips - Pear thrips and citrus thrips are pests of willows. Numerous galls can cause stunting, discoloration and dieback. While they are usually about the size of a pinhead, a larger aphid attacks tree leaves, sucking their sap and causing them to turn yellow and curl. Aphid colonies on the lower branches can be dislodged with a strong stream of water from the garden hose. They make sinuous interlacing, flattened galleries in the inner bark and sapwood, girdling infested limbs or trunk and interfering with the tree's circulation. These include infestation by gypsy moth caterpillars, willow leaf beetles and bagworms that will defoliate the tree. Blighted branches die back. This blight is a fungal infection that attacks newly developing areas of the tree. Although rust infections are not considered serious, they can defoliate young trees. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. Those spots can also crack and peel as time passes. Adult beetles develop during July and produce a second brood in August. They cause damage by rasping at plant cells and sucking sap from the injury. Gypsy moth larvae are often confused with the eastern tent caterpillar and fall webworm, both of which make silken tents in trees. Informational table showing disease name, symptoms, pathogen/cause, and management of Willow diseases. Leaf Undersides DamagedImported Willow Leaf Beetle - Imported willow leaf beetles are metallic blue beetles, about 1/8 inch long. Cut down and destroy any affected trees. Willow leaves may be severely mottled and yellowed by this pest.Leaves are SkeletonizedSawfly - Adult willow shoot sawflies are wasp-like, but with thicker midsections, 5/8 to 1 ½ inches long. Cutting the top of the tree back won't help as the roots are already out there. There is no effective protection from this problem, except to site the trees in areas that are somewhat sheltered from wind.Bark Attacked, Leaves Curled and DistortedAphids – Aphids are soft-bodied, pear-shaped insects that cluster on growing tips, new leaves and flowers of many plants. They grow best in sites with full sun. Willow scab refers to the discoloration of tree leaves and branches with black or brown spots and cankers, according to University of Florida Extension. In early June they emerge and lay eggs. Willow leaf surfaces become flecked and whitened, leaf tips wither, curl up and die. The three most common diseases in willow are crown gall, black canker or scab. If your willow tree bark is falling off, it could be a sign of borer insects. Crown gall is a root disease... Insects. They have four long, narrow wings fringed with long hairs. These are not your tree’s problem if your willow tree bark is falling off. These trees do exceptionally well when you can place... 3. Sign up for our newsletter. The borers or larvae are ½-inch long worms that damage the bark of living, injured, and dying trees. They won't shrink back. Twigs are dwarfed, and the terminal bud is killed, which causes staghorn growth of side shoots. Uncontrolled, gypsy moth caterpillars can defoliate a tree completely. In the wild, willows often grow by lakes, rivers or other bodies of water. There must be partial sunlight available for the willow hybrid.. The tree will heal from sunscald, but you can protect your wills by acting before winter. They are identified by lemon yellow spots on leaf undersides, that later develop into spore-bearing pustules. Crown gall can also make the tree susceptible to secondary tree diseases that enter decaying galls. The fungus remains in the plant debris littering the tree base and presents the problem of continued infection. Bacterial blight damage resembles frost injury and may be confused with it. Treatment involves pruning infected branches as well as continual clean up and disposal of damaged leaves. Leaves Consumed, Conspicuous Tawny Egg Masses PresentGypsy Moth -Gypsy moth caterpillars grow from about 1/16 inch long at hatching to about 2-1/2 inches long by the time they become pupae. This disease is often a result of over-watering. The eggs look like little gold pearls. Do not replace them with herbaceous or woody plants susceptible to crown gall. This causes peeling bark on willows. But as soon as the temperatures plunge, the cells freeze and rupture. The three most common diseases in willow are crown gall, black canker or scab. List of the Cons of a Willow Hybrid 1. Be careful not to cause wounds in healthy trees with yard equipment through which infection can occur.Leaves Covered With White PowderPowdery Mildew – The ends of twigs, leaves, and blossoms covered with white to pearly-gray velvety mold, indicate Willow trees are infected with powdery mildew. # A weeping willow tree is mostly affected by root rot which has its ill effects on the roots of the tree and eventually leads to its decline. Although willows are not sickly trees, a few diseases and pest infestations do attack and cause willow tree problems. Wingless females and larvae (caterpillars) live in distinctive 2-inch long bags of tough silk, camouflaged with bits of vegetation that hang from willow branches like ornaments. Paint the trunks with diluted, white paint in early winter to prevent sunscald. Leaves Of Kilmarnock Willow Have Developed Green Lumps, Young Willow Tree Has Small Red Balls Growing On Trunk, Only Tops Of Flaming Willow Branches Have Leaves, Pussy Willow Has No Leaves And New Growth At Bottom Of Trunks, Willow Trees Has Clusters Of Little Red Bumps All Over Trunk, Salix Ca Pendula Top Is Full But Trunk Not Growing, Kilmarnock Willows Are Suffering From Leaf Curl, Corkscrew Willow Leaves Are Curling And Rolling This Year, Pussy Willow Leaves Branches And Flower Buds Have Started To Turn Black And Die, Young Willow Tree Has No Leaves On One Side, Pussy Willow Has New Branches That Are Yellow With Brown Bumps. However, the tree is vulnerable to several diseases and pests, including a few that cause willow tree bark peeling. They have 2 pairs of transparent wings. Your best bet if your willow tree has borers is to clip out all diseased branches. Their legs are very short. Several foliar diseases affect the willow tree’s leaves, including powdery mildew, … Adults are small square-shaped bugs, 3/16 inch long or less, with elaborately reticulated wings that resemble lacework. Willow scab fungus wi… Willows most often get sunscald in winter when sun reflects off bright snow. These include infestation by gypsy moth caterpillars, willow leaf beetles and bagworms that will defoliate the tree. Another possible reason for willow tree bark peeling is too much sun. Holes in Leaves and Girdled TwigsBagworm - Adult male bagworms are black, clear-winged moths. Twigs are dwarfed, and the terminal bud is killed, which causes staghorn growth of side shoots. A few of the most serious willow tree problems do not cause peeling willow bark. Yellowish Spots and Dark Pustules on … Make sure to plant your weeping willow at least 50 feet away from your house. Weeping willow trees do best when planted in areas that receive full sun to partial shade, in slightly acidic, moist soil. However, the same could be said for many other large trees and shrubs. All romance aside, weeping willows are problem trees prone to diseases and pests. Willows are not picky trees and most thrive in almost any kind of soil as long as there is adequate sunlight. My bother and sister in law have a Kilmarnock Willow planted in a pot, it’s been fine for 2 years but now appears to be dying , the pot appears plenty big enough, they water it daily, have done nothing different, I will attempt to upload pics. The worst willow diseases include: Crown gall, which causes stunting and dieback Both poplar and willow borers can tunnel through the inner layer of the willow bark. Tumor-like Swellings on Roots, Trunk or BranchesCrown Gall - A certain bacteria infect willow trees through wounds and stimulate its cells to form tumor-like swellings (galls). Do they have problems? Willow Tree Disease and Bark Peeling Off Disease. janegallagher00 Posts: 3. Willow trees (Salix spp.) They prey particularly on trees that are low in vigor due to drought, transplanting, bark wounds from yard-care equipment, or insect attack. Gypsy moths do not make tents. A severe infection will cause the willow leaves to drop. These beetles cause a lot of damage to willows in the New York area.Foliage Turns Pale or MottledLace Bug - Willow lace bugs suck sap from leaf undersides. Pests. The roots of a willow tree generally go out 4 times further than the growth of the top of the tree. As to the notion of destroyed pipes and foundations, if pipes are leaking and foundations have cracks, willow roots will take advantage of these available resources. Leaves Wilted, Discolored, Branches Cankered, Die BackBacterial Blight - A blight caused by bacteria causes willow leaves to turn brown and wilt. Crown gall is a root disease that causes galls, or growths, to form along the lower portion of the trunk. Ranging in size from peas to large burls growing to 1 or 2 feet in diameter, these galls have rough, irregular surfaces.