What is killing blue spruce trees in Michigan?
Numerous insect pests can impact spruces in Michigan’s landscape, but the two most common are gall adelgids and spruce spider mites. In both cases, the insect pests are tiny and you may need a hand lens to see them. Often times, people are more likely to see the damage as opposed to the insect pests themselves.
What disease is killing blue spruce trees?
Rhizosphaera Needle Cast Blue spruce trees are susceptible to an infectious needle disease caused by the fungus Rhizosphaera. The disease, referred to as Rhizosphaera needle cast, is the most common problem seen on blue spruce samples that are submitted to the Plant Disease Clinic.
How do you treat a sick blue spruce?
Fungicides with the active ingredient chlorothalonil, copper hydroxide or mancozeb will protect new spruce needles from infection by Rhizosphaera.
- Make one application in spring or early summer when the new needles have grown to half their mature length.
- Make a second application 3 to 4 weeks later.
How can you tell if a spruce tree is diseased?
Here’s what to look out for:
- Needles Turn Yellow or Brown and Drop Off. It’s easy to tell whether your blue spruce trees are healthy or not.
- Drying and Dying of Lower Branches. When you see lower branches of a blue spruce drying and dying, you should expect the worst.
- Dying of New and Emerging Shoots.
How do you revive a dying blue spruce?
The following will help you manage needlecast:
- Prune away dead branches, twigs, and infected areas of the tree.
- Remove fallen foliage and destroy it (burn it).
- Apply a fungicide to the tree after removing signs of the infection.
- Deep water the tree once per week to help it recover from the stress.
How do you treat blue spruce cytospora canker?
Management: There is no known cure for cytospora canker. Fungicide treatments are not recommended. The Davey Institute recommends maintaining the health and vitality of susceptible trees to manage the disease; healthy trees are less susceptible to cytospora canker.
What is the life expectancy of a blue spruce tree?
Growth and Yield- Blue spruce is apparently a long-lived tree, surviving up to 600 years or more. Diameter growth is slow; trees 10 to 13 cm (4 to 5 in) in d.b.h. may be 125 to 135 years old; at 46 to 56 cm (18 to 22 in), they may be 275 to 350 years of age (84).
How do you revive a dying spruce?
Prune any dead or diseased branches off the tree, remove any debris around the base that could attract plant diseases, and keep it well watered. If you know there are pine beetles attacking trees in your area, apply insecticide to the tree preemptively.
Why is my blue spruce dying from the bottom up?
There could be several reasons for the lower branches dying on your spruce. If the upper branches provide too much shade, the lower branches naturally die off. Also, several diseases can contribute to branch dieback. Cytospora canker is a fungus that attacks spruces and causes branch death.
Will blue spruce needles grow back?
These voracious eaters strip needles from spruce, and those needles will NEVER grow back. In three years, they can kill a tree. If your spruce is under attack DO NOT PRUNE the stripped branches. The bud at the tip is still alive, and will produce new needles next Spring which will disguise the damage.
What is the best fungicide for trees?
Liquid Copper Fungicide Spray is a key tool in disease prevention and treatment on a large variety of trees. It effectively controls diseases such as anthracnose, bacterial leaf spot, fireblight, and botrytis among many others.
What does canker fungus look like?
Cankers are usually oval to elongate, but can vary considerably in size and shape. Typically, they appear as localized, sunken, slightly discolored, brown-to-reddish lesions on the bark of trunks and branches, or as injured areas on smaller twigs.