Pests and Diseases

Blog Archives

Information of tree and shrub pests and diseases.

Decline in Spruce Trees

Over the past decade, spruce trees have suffered an abundance of issues. All species of spruce, including Colorado blue and white spruce, are being affected, but particularly concerning is the prevalence of ‘decline’ symptoms on well-established Norway spruce. Originally a

Posted in Environmental Issues, Pests and Diseases

Deadly Boxwood Infection: How to Prevent Boxwood Blight

Boxwood blight is caused by the non-native fungus Calonectria pseudonaviculata. American and English boxwood (Buxus sempervirens) are most susceptible to this disease whereas many Asian species of boxwood, and hybrids with Asian parents, are generally more resistant, but can still

Posted in Pests and Diseases Tagged with: insects and diseases

Pear Trellis Rust

Pear trellis rust is caused by the fungus Gymnosporangium sabinae. It was introduced into the United States from Europe in the 1990s and has been progressively spreading through states in both the East and West. The disease affects common pear,

Posted in Pests and Diseases, Tree Advice

Sawflies

Adult sawflies are often similar in appearance to flies or wasps. The larvae are also similar, though sawflies have one simple eye on each side of the head and five or more pairs of prolegs on their abdomen, whereas butterflies/moths

Posted in Pests and Diseases, Tree Advice

Treating Bacterial Leaf Scorch

Bacterial leaf scorch (BLS) is caused by the bacterium Xylella fastidiosa. This disease impacts certain shade trees resulting in uneven ‘scorching’ of leaf margins in late summer and early fall. The bacteria themselves live in the xylem tissue and gather

Posted in Pests and Diseases, Tree Advice

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