Apple scab (Venturia inaequalis) is a problem wherever apples are grown; it’s more serious, however, in temperate areas that experience cool, wet weather in spring and early summer.

This common scale (Coccus hesperidum) attacks a wide range of houseplants, including anthuriums, citrus, dieffenbachia, ferns, orchids, and ornamental figs.

Introduced from Europe, the cabbage maggot (Delia radicum, formerly Hylemya brassicae) is a serious pest of vegetable gardens in the northern United States and Canada. The fly primarily feeds on crucifers such as cabbage, cauliflower, …

This armored scale (Unaspis euonymi) from Asia is a serious pest of euonymus throughout the United States and Canada.

The sudden appearance of mushrooms on the lawn can sometimes seem magical, especially when they are arranged in a circle. These so-called fairy rings may be a foot in diameter or 100 feet across. They …

The eastern mole (Scalopus aquaticus) can be found from Ontario to Florida. Of the seven species of moles present in the United States, it is the most widespread, and the one that is most likely to disrupt lawns and landscapes with its tunneling.

The citrus mealybug (Planococcus citri) is a major greenhouse and houseplant pest. In subtropical climates, this sucking insect is also a problem outdoors.

Mexican bean beetle (Epilachna varivestis), a member of the ladybug family, attacks many kinds of beans—bush, pole, and lima—as well as cowpeas and soybeans.