Problem Info . Rhizosphaera needle cast is caused by the fungus, Rhizosphaera kalkhoffii. Rhizosphaera needle cast is a very significant disease of landscape, nursery and plantation conifers. By continuing to use this site, you accept our use of cookies. A healthy spruce will retain its needles 5 to 7 years, whereas a spruce severely infected with Rhizosphaera needle cast may hold only the current year's needles. We have approximately 36 spruce trees with various degrees of needle loss and discoloration. Introduction. Infected needles first appear mottled or speckled with dull yellowish blotches. Maintain tree health, and monitor for any disease/insect problems. Davey uses cookies to make your experience a great one by providing us analytics so we can offer you the most relevant content. Colorado blue spruce and Engelmann spruce most susceptible 2. Protecting new growth as it emerges is very important. 1. Severely infected trees may hold only the current year's needles; whereas, a healthy spruce will retain needles 5 to 7 years. A disease that causes needle damage on spruce trees Rhizosphaera needle cast is a foliage disease of spruce trees. White spruce occasionally susceptible Fertilize with Arbor Green PRO to invigorate plant growth. We have been told by a licensed arborist that they are suffering from rhizosphaera needle cast diease and spider mites. Rhizosphaera needle cast is a fungal disease of spruce trees that causes needles to turn brown and fall off. Early identification of Rhizosphaera can prevent major damage to individual trees and prevent the spread to nearby trees. Other hosts include: deodar cedar, Douglas fir, true firs, hemlocks, pines and coast redwood. Davey uses cookies to make your experience a great one by providing us analytics so we can offer you the most relevant content. Two year old needles turn yellowish brown to purple in mid-summer. Branches may die after 3 or 4 years of infection. Many spruce species, such as Colorado blue and Engelmann spruce are highly susceptible; white spruce is intermediate in susceptibility. Follow label rates and frequency for the product of choice. For best effectiveness, fungicides should be applied when the emerging needles are half elongated (1/2 to 2 inches in length). How do I save a tree or shrub with Rhizosphaera needle cast? Symptoms usually begin on the inner and lowest portions of the tree and progress upward. You can have your tree looking lush and beautiful again within a few years by following a program of needle cast treatment. Older, inner needles show symptoms first. Rhizosphaera needle cast is caused by fungal pathogens within the genus Rhizosphaera. This disease is found throughout the northern hemisphere. Rake up and dispose of fallen needles. Infected needles of other plant species usually become off-green, later turning to tan or brown. Trees stressed from drought, poor planting practices or other factors are more likely to suffer from Rhizosphaera needle cast. Infected needles with rows of fruiting bodies (pycnidia) protruding through the stomates. Rhizosphaera needle cast is best managed using a combination of methods: Plant only disease-free plants. Deep root water during periods of drought. Tiny fruiting bodies (pycnidia) protrude through the stomata of the infected needles. As the fungus matures, rows of black fruiting bodies develop on the needles. Rhizosphaera and Stigmina, the two most common needle cast diseases of spruce trees, are treatable. Although needles on new growth become infected in May and June, symptoms are not visible until late fall or the following spring, when infected needles turn purple to brown and begin to drop. It can take up to 15 months for the needles to show visible symptoms after the initial infection. Begin treatment with a registered fungicide in spring at half-needle elongation. Under a hand lens, these stomata appear as fuzzy black spots instead of their usual healthy white color. ©2020 The Davey Tree Expert Company. During wet weather in late spring, spores are released from these fruiting bodies and are rain splashed onto newly developing needles where infection occurs and the disease cycle is repeated. Twelve to fifteen months after infection, needles will drop prematurely. All Rights Reserved. , Jim Casey Joins Rainbow as a Territory Manager, 2-3 applications beginning at bud break and continue every 14 days until full needle extension. Management & Treatment Options Prune out severely affected branches. Tree Service Experts Since 1880. View our. Rhizosphaera needle cast (Rhizosphaera kalkhoffii) is a foliar disease of spruce trees. Fungicide treatments Rhizosphaera needle cast is the most common disease on spruce trees that is received in the Plant and Insect Diagnostic Clinic. Spruce tree rhizosphaera needle cast diease treatment. Treat spruce for Pine Needle Scale using Transtect™. It is most common in trees growing outside of their native range. Treatment Strategy. At M&M Tree Care, we’ll treat the tree for the fungus over the course of two years. This disease is … Rhizosphaera needle cast is a very significant disease of landscape, nursery and plantation conifers. Recommended treatment for needle cast disease of spruce trees (rhizosphaera) typically is a spray treatment in May with one or two follow -up sprays. The emerging needles are half elongated ( 1/2 to 2 inches in length ) the... Then turn purple-brown, dropping by late autumn lose rhizosphaera needle cast treatment needles for 3 to 4 consecutive years may.. Other factors are more likely to suffer from Rhizosphaera needle cast is a foliage disease of landscape, nursery plantation. To reduce the severity of cytospora canker protection of new growth is the motivation spraying. 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