Category: Trees

Eastern Tent Caterpillar

In the spring, just as the leaves are starting to expand on trees, silken webs sometimes appear on tree branches and stems – they start small, then gradually increase in size until they can be...

Elm Zigzag Sawfly

Introduction The elm zigzag sawfly, or EZS, is an invasive pest that defoliates native and non-native elm species. It originates from East Asia but has been a problem on elms in Europe since 2003....

Bess Beetles

Bess beetles (Family Passalidae) are wood-dwelling, socially active beetles with around 500 species worldwide. They often live in decaying wood in forests. Burrowing through the decaying wood, they...

Algal Leaf Spot

Of the various kinds of organisms that cause plant disease, plant parasitic algae are not the norm. The only species that is common in the United States is Cephaleuros virescens. It causes a disease...

Japanese Cryptomeria

Japanese cryptomeria (Cryptomeria japonica), or Japanese cedar, is a splendid evergreen that becomes even more handsome as it matures. Native to Japan and southern China, cryptomerias are excellent...

Camellia Diseases & Insect Pests

Camellias are one of the most desirable and well-adapted plants for Southern gardens. Many of the common problems of sasanqua camellia (Camellia sasanqua, C. hiemalis, and C. vernalis) and the...

Crapemyrtle Bark Scale

The crapemyrtle bark scale (Acanthococcus lagerstroemiae) is an introduced pest from Asia that initially infested crapemyrtles (Lagerstroemia spp.) in Texas in 2004. It then spread rapidly through...

Powdery Mildew

Introduction Powdery mildew is the name given to a group of diseases caused by several closely related fungi. Their common symptom is a grayish-white, powdery mat visible on the surface of leaves,...

Black Twig Borer

Black Twig Borer (Xylosandrus compactus) is a species of a scolytid beetle and is one of the few ambrosia beetles that will infest healthy or stressed plants. The adult beetle is solid black, shiny,...

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