Thrips

Thrips are slender, tiny insects that often have fringed wings and are generally 1 mm or less in size. Nymphs are elongate, lack wings and range in color from off-white or yellow to brown or black. Most thrips feed by sucking out cell contents of leaves or flowers, but some can cause leaf distortions or […]

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Aphids

Aphids are soft, pear-shaped insects that have long legs and antennae with tube-like structures called “cornicles” that protrude out of the hind end of the body. This family of insects contains most plant virus vectors (around 200 known) such as the green peach aphid. They can appear in a range of colors including green, yellow, […]

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Invasive Shot Hole Borer

Invasive Shot Hole Borer (ISHB) is an exotic ambrosia beetle that was first detected in 2003 in Southern California. It is currently found in L.A., Orange, San Bernardino, western Riverside, and San Diego Counties. The “ambrosia” name refers to a symbiotic fungus that is carried by the female in special organs in her mouth parts. […]

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Asian Longhorned Beetle

The Asian Longhorned beetle is an invasive, wood boring insect introduced to the U.S. via packing materials. ALB is a member of the Cerambycid family. The adults are large, black beetles, approximately 1 – 1 1/2 inches long with irregular white spotting on their wing covers and very long, black and white striped antennae. On […]

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Conifer Spider Mites

Spider mites infest a variety of conifer species, including pines, spruce, hemlocks, arborvitaes and others. The mites pierce and suck nutrients from conifer needles.   Because spider mites are so tiny, the easiest way to diagnose infestation is to take a twig sample from your conifer and beat it against a white piece of paper; […]

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Red Gum Lerp Psyllid

The red gum lerp psyllid (RGLP) (Glycaspis brimblecombei) is a foliar pest on red gum eucalyptus trees (Eucalyptus camaldulensis).   Like Eucalyptus trees, the RGLP is native to Australia. RGLP is a plant-juice sucking homopteran in the family Psyllidae. The nymphs form a protective covering of crystallized honeydew called a lerp, which protects the insects […]

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Hemlock Woolly Adelgid

The Hemlock Woolly Adelgid (HWA) is a tiny, piercing and sucking insect, unseen with the naked eye, that feeds on hemlock twigs at the bases of the needles. HWA is an invasive species from Asia which has infested the US East Coast hemlock forest from New Hampshire to Georgia, inhibiting twig growth throughout.  It has […]

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Leaf Chewing Caterpillar

Caterpillars belong to the insect order Lepidoptera. Caterpillars are the larval stage of moths and are among the most serious defoliators of trees.   One example is the eastern tent caterpillar Malacosoma americanum, responsible for defoliating forest trees, as well as cherry, apple and other ornamental shade trees. Other Lepidoptera pests include the gypsy moth, […]

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Pine Bark Beetles

There are numerous species of Ips and Dendroctonus, bark beetles, that infest conifers throughout North America.  Adults tunnel through the bark, mate and lay eggs in the phloem (inner bark). The larvae develop in the phloem and cambial region; pupal development is completed in the outer bark. Adults develop from pupae and emerge by boring […]

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