What diseases affect evergreen trees?

Toxic or Treatable? Most Common Evergreen Diseases

Cytospora Canker of Spruce.
Rhizosphaera Needle Cast.
Bagworm.
Cercospora Blight.
Diplodia (Sphaeropsis) Blight – specialty evergreen.
White Pine Weevel.

What does fungus look like on evergreens?

They look like orange octopuses, with slimy tentacles (called teliohorns) dangling from the main gooey mass.

What kind of fungus grows on evergreen trees?

Two fungi cause most of the canker diseases found on evergreens. The fungus Sphaeropsis (also called Diplodia) causes cankers on pines, especially Austrian pines, as well as concolor firs. The fungus Cytospora is the most common cause of cankers on spruces.

What is killing my evergreen trees?

Bagworms, spider mites, bark beetles, aphids, scale, sawflies, borers, and adelgids are among the insects that commonly target different needled evergreens. As with disease, bugs tend to gravitate toward plants that have been stressed or compromised by other issues.

How do I know if my Evergreen has root rot?

DAMAGE. When the root system of the plant is examined, the roots are black, mushy and slough away in your hand. There may be a swampy smell to the root ball, indicating rotting vegetation.

What is the best fungicide for evergreen trees?

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.

What kills fungus on evergreen trees?

These foliar fungal diseases can be treated with fungicide sprays applied at the right times- just as buds are swelling in the spring, and again in 7 to 10 days when leaves are small and before the bloom. Many fungicides are labelled for scab.

When do you spray evergreens for fungus?

But timing is everything. For rhizosphaera needle cast, the spraying must be done during the last two weeks of May and repeated four to six weeks later. The middle of August is too late. And the treatments usually need to be applied for two years.

Why has my evergreen tree gone brown?

Evergreen browning can be caused by weather conditions. According to Home Guides, “When winters are dry or so cold that the ground freezes, evergreens don’t get the water they need to make up for moisture lost through transpiration — evaporation of water through foliage — and turn brown.

Are there any diseases that can kill trees?

Evergreen diseases are often fatal to trees and shrubs. Be aware of the signs and symptoms of the most common diseases so you will know right away if there is a potential problem.

Are there any problems with needled evergreen trees?

The range of needled evergreens that perform well in the lower Midwest is few. To keep the trees in top health you should be aware of and control the following top problems we see at the Kemper Center for Home Gardening. Bagworms are common on junipers and arborvitae. Caterpillars hatch in spring and form a protective bag as they feed on foliage.

What kind of trees are susceptible to Diplodia?

Diplodia sapinea is the opportunistic fungal pathogen responsible for this disease. It affects various 2 and 3 needle pines and conifers. Especially susceptible are red pine, Mugo pine, Scots pine, Ponderosa pine, and Austrian pine.

What are the symptoms of rust on evergreens?

Evergreens are susceptible to rust diseases. The symptoms of these fungal diseases are powdery-looking orange, red or yellow fungal spores on the needles or leaves. Spores form first on the underside of the leaves but, as the fungus progresses, they move to the top. The leaves may also drop off.