Ash: Emerald ash borer (EAB) Categories: All Insects Ash Ash Insects High Alert Invasive Insects High Alert Invasive Pests Ornamental trees Ornamentals Last review date: 2026-11-02 02:25 Last edit date: 2026-10-15 Without intervention, a city can expect to lose 90% to 100% of its ash trees within about a decade of infestation by the emerald […]
Japanese Beetle Categories: All Insects High Alert Invasive Insects High Alert Invasive Pests Last review date: 2026-11-03 12:46 Last edit date: 2026-11-02 You can see metallic green coloring on a Japanese beetle’s head, legs, and the hard, plate-like shield right behind the head (pronotum). This male beetle has a sharp spine visible on its front […]
Spotted Lanternfly Categories: All Insects High Alert Invasive Insects High Alert Invasive Pests Last review date: 2026-11-03 11:50 Last edit date: 2026-11-02 This Spotted Lanternfly’s spread wings show off the unique colorway of the invasive planthopper. Image credit: ©Allen Browne/iNaturalist Biology The spotted lanternfly (Lycorma delicatula) is an invasive planthopper, native to Asia, that may […]
The Micro-Wasps Categories: All Insects Micro-Wasps Pollinators Wasps Last review date: 2026-04-29 10:09 Micro-wasps feeding on the nectar of a Mariposa Lily Photo by: D.G. James Biology There are about 20 families that contain micro-wasps, barely visible, without a hand lens or microscope. There are many thousands of species of these micro-wasps and most of […]
Common Insects and Mites: Aphids Categories: All Insects Common Insects and Mites Common Problems Last review date: 2026-04-29 10:25 Numerous lady beetle larvae and lone spider feasting on large aphid colony. Photo by: Craig Lawrence – WSU Extension Master Gardener Biology Many species of aphids attack ornamental plants. Some are fairly host-specific, while others may […]
Common Insects and Mites: Asian lady beetle Categories: All Insects Common Insects and Mites Common Problems Last review date: 2026-11-02 06:42 Cluster of Asian lady beetles Photo by: A.L. Antonelli Biology Common in Japan, Korea, and other parts of Asia, the Asian lady beetle was introduced by USDA Agricultural Research scientists in the late 1970’s […]
Common Insects and Mites: Bark beetles Categories: All Insects Common Insects and Mites Common Problems Last review date: 2026-11-02 06:42 Bark beetle larval galleries Photo by: A.L. Antonelli Biology One or more species of bark beetle attack virtually all trees in the Pacific Northwest. Most bark beetles are secondary pests, attacking trees already stressed from […]
Common Insects and Mites: Brown marmorated stink bug Categories: All Insects Common Insects and Mites Common Problems Last review date: 2026-11-02 08:54 Adult brown marmorated stink bug Photo by: D.R. Lance, USDA-APHIS Biology The brown marmorated stink bug (BMSB) is an introduced pest species from Asia that is spreading quickly across the United States. Nymphs […]
Common Insects and Mites: Brown soft scale Categories: All Insects Common Insects and Mites Common Problems Last review date: 2026-11-02 06:42 Brown soft scales Photo by: R.S. Byther Biology Brown soft scale appears as a small, brown or pale yellow, flat disk. While it is more commonly a greenhouse pest, it can be a serious […]
Common Insects and Mites: California gallfly Categories: All Insects Common Insects and Mites Common Problems Last review date: 2026-11-02 06:42 “Oak apples” caused by California gallfly Photo by: R.S. Byther Biology The gall of this cynipid wasp larva is the largest and most conspicuous of the galls on oak. It is a twig gall that […]