How do you treat a needle cast on a blue spruce tree?

How do you treat a needle cast on a blue spruce tree?

Fungicides with the active ingredient chlorothalonil, copper hydroxide or mancozeb will protect new spruce needles from infection by Rhizosphaera.

1. Make one application in spring or early summer when the new needles have grown to half their mature length.
2. Make a second application 3 to 4 weeks later.

Can a blue spruce recover from needle cast?

The tree becomes unattractive and may look as though it is dying, but don’t despair. Rhizosphaera and Stigmina, the two most common needle cast diseases of spruce trees, are treatable. You can have your tree looking lush and beautiful again within a few years by following a program of needle cast treatment.

How do you heal a blue spruce?

Currently the only chemical treatment for Cytospora canker on blue spruce in the landscape is an injected fungicide that must be applied by a certified applicator. Yearly fungicide treatments can help with needlecast but appropriate timing and good coverage are essential to reduce needle loss.

Why are my blue spruce trees losing their needles?

The most common cause for needle drop is simply natural causes. Needles will stay on a spruce tree for 2-3 years before dropping, typically from the inside of the tree and on older branches. Cytospora canker is expressed through dead areas, known as cankers, which form at the base of the branches.

Are blue spruce trees dying?

Unfortunately, blue spruce trees are subject to a wide range of insect and disease problems that can impact their growth and aesthetic appeal. The prevalence of diseases on blue spruce trees has intensified in recent years and trees are declining rapidly in many areas (Photo 1).

What to do with dead needles on blue spruce?

For now, shake dead needles off of affected branches and rake up and remove needles from beneath the trees, because the dead needles harbor large amounts of inoculum of this disease organism. It is imperative that you treat the entire tree next spring with the chlorothalonil fungicide just after bud break and before needles are half elongated.

Why are the needles on my Blue Spruce turning yellow?

Tree check: Most often, this fungus attacks spruce trees, especially Colorado blue spruce trees and Engelmann spruces. Click here for a more extensive tree list. And stressed trees are also more susceptible.

When to spray a diseased blue spruce tree?

Diseased trees can also be sprayed with a fungicide (this will help protect fresh growth and prevent new infections), though you’ll want to carefully read the product label for specific timing instructions. Fungicides should be applied when the new needles are half-elongated (in late April or early May), and again three to four weeks later.

What kind of tree has a needle drop?

Rhizosphaera Needle Cast, commonly referred to as Needle Drop, is a fungal disease that infects Colorado Blue Spruce. White Spruce and Black Hills Spruce are a bit more resistant to the infection but can also become susceptible in the cool, wet spring or humid summer.

Why are needles turning brown on blue spruce?

If this is what you’re seeing, your blue spruce tree is likely suffering from needle cast disease. Once these needles turn brown, yellow, or red, they will likely begin to shed. Many homeowners that are experiencing needle cast will often describe their blue spruce as looking burned.

Why is my Blue Spruce dying?

Bare or dying branches on a Colorado blue spruce tree are commonly caused by a few different insect pests or one or more diseases. All of these problems can be exacerbated by drought stress, poor soil conditions, mechanical damage, and climatic conditions such as high humidity.

Can You Help my Blue Spruce?

Apply a chelated iron-rich fertilizer if a blue spruce develops a yellow or yellow-green color. A shortage of iron will cause the needles of a blue spruce to lose their blue coloration. The fertilizer will replace the depleted iron and help the needles regain their blue color.

What makes blue spruce loose needles and turn brown?

An excellent windbreak tree, the blue spruce is susceptible to fungal diseases that cause its needles to turn brown or red and prematurely fall. A lack of moisture is the chief suspect when the blue spruce tree begins losing its needles. The first symptom of water stress is the browning of the needles followed by their dropping to the ground.