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Insect & Disease Resource Center

Browse More Pests and Diseases

  • Verticillium Wilt
    Verticillium Wilt

    Verticillium wilt is a fungal disease that causes serious injury and often death to its host. It is caused by the fungus Verticillium dahliae and can live in the soil for long periods of time without showing any signs.

  • Western Tussock Moth
    Western Tussock Moth

    The western tussock moth is considered a pest and commonly found on the Pacific coast from southern California up to British Columbia.

  • Whitefly

    Although they look like miniature white moths, whiteflies are neither moths nor flies. Instead, they are insects of varying species in the order of Homoptera, which also includes aphids, scales and mealybugs. Whiteflies seemingly “show up out of nowhere,” often when greenhouse plants and nursery stock are planted. Whiteflies have yellow or orange bodies with a waxy coating that makes them appear white.

  • Winter Moth
    Winter Moth

    The male fringe-winged winter moth is often seen in homes and around lights and holiday decorations in December and January. This invasive pest arrived in the U.S. and Canada from Europe. In Canada, it is well known in Nova Scotia, Vancouver, British Columbia and other locations. In the U.S., it is found predominately in coastal Massachusetts, Rhode Island, Washington and Oregon.

  • Wood Decay Fungi in the Landscape
    Wood Decay Fungi in the Landscape

    Certain fungi attack multiple species of trees. Mushroom growths, called conks, are seen on the lower portion of the trunk and vary in shape, size and color.

  • Zimmerman Pine Moth
    Zimmerman Pine Moth

    Zimmerman pine moths are 5/8” long with gray wings marked with mottled red and gray. Once a year, their larvae hatch and tunnel into trees, interfering with the tree’s sap flow and weakening them. Eventually, wind may break the weakened tops.