See All Pest, Disease and Weed Identification

Pear psylla adults, Cacopsylla pyricola, look like small cicadas and become active any time the temperature is above 40°F.

Nematodes undoubtedly are the most numerous multicellular animals in the world. You can pick up a handful of soil almost anywhere and extract nematodes from it.

Bacterial spot, Xanthomonas arboricola pv. pruni, is a difficult disease to manage.

Early season apple disease management is primarily directed at controlling scab.

Lifting the PPV quarantine in Pennsylvania offered the opportunity for a "fresh start" and growers must plan carefully to get the most from their investment.

The fungi causing fruit rots can be quite stealthy since spores will land on the fruit and cause symptoms after the fruit have been in storage.

The pear leaf spot fungus, Mycosphaerella pyri, infects the leaves of pear, quince, and occasionally apple trees. Numerous leaf spots can produce defoliation.

Although it is not particularly common, pear scab is very destructive when it does occur.

Weed control can be accomplished chemically or mechanically. Depending on the situation, each method has its advantages and disadvantages.

Cytospora canker, also known as perennial canker, peach canker, Valsa canker, and Leucostoma canker, can cause trees in young orchards to die. Infected trees in older orchards slowly decline.

Spotted lanternfly is an invasive insect pest, and Beth Finlay demonstrates how to build circle traps to trap them in this short video tutorial.

Armillaria root rot, sometimes called shoestring root rot, is caused by various species of the fungus Armillaria.

Discover how to identify and manage spongy moths, and learn practical steps to reduce the damage this invasive pest causes to forests and communities.

The cigarette beetle is a common insect in Pennsylvania that infests many types of stored products.

A commercial pest as well as a household pest, the cosmopolitan larder beetle was historically a pest of cured meats in Europe, the United States, and Canada.

These native ants feed on many items found in homes, but prefer food high in sugars. Outside, they feed on aphid honeydew and nectar from flowers and buds.

The elongate hemlock scale, sometimes known as the fiorinia scale, is a serious armored scale insect pest on ornamental and forest hemlock trees in Pennsylvania.

The euonymus scale is a key pest of euonymus, pachysandra, and bittersweet. This armored scale insect is native to Japan and China.

Earwigs are active at night and hide during the day in cracks and crevices. Despite the name, these scavengers do not crawl into the human ear.

The European pine sawfly is common in Pennsylvania. The larval stage feeds on the needles of pine trees in landscapes, nurseries, and Christmas tree plantations.

Cockroaches are among the most common of insects.

The twospotted spider mite is a general feeder that attacks a wide variety of plants including shade trees, shrubs, and flowers.

Slugs are closely related to snails and differ from them by the absence of an external shell.

Springtails are small, abundant, insect-like critters. If they become a nuisance in homes, it is usually during extended droughts or prolonged, saturating rains.

Three types of lice infest humans: head lice, body lice, and pubic or crab lice. Bites cause much discomfort, and scratching often leads to secondary bacterial infections.