These invasive shot hole borers (ISHB) look identical, and additional look-alike ambrosia beetles (e.g., Euwallacea fornicatus) may also have been introduced into California. This beetle has spread throughout much of California wherever eucalyptus grows. Borers belong to several different insect groups, including a variety of beetles, moths and horntail wasps. The Broad-Necked Root Borer. Determine if your infestation is active with wood eating bugs, then replace or treat wood with a borate-based product to kill the larvae and get rid of wood boring beetles. At this time, the parasitoid injects a paralyzing venom that immobilizes the beetle larvae. The California prionus is widely distributed in western North America from Baja California and Mexico to Alaska. 1 . This beetle’s ovipositor is protruding from the end of the abdomen. The beetles won’t get into the soil around the palm (they’ll get stuck scaling the wall), can’t eat through the plastic or aluminum and the roots of the palm will grow through the bottom. A parasitoid egg is then laid next to the paralyzed host and upon hatching the parasitoid larva feeds on the eucalyptus longhorn borer beetle larva eventually killing it. Identification The first obvious symptoms of ISHB infestation are patches of discoloration and oozing on bark, which can be dark, dry, water-soaked, or oily looking. Some are quite small, like the turpentine beetle and others can be several inches long like the hissing borer. The majority of the three to five year life cycle is spent underground as larvae, feeding on the roots of trees and shrubs. However, biological control has been less effective against this new borer. California Root Borer. Wood-boring beetles such as Powderpost, Japanese, or any common furniture beetle can damage almost any wood structure. I like This. This lovely beetle is a female California Root Borer, Prionus californicus, and you can see a matching photo on BugGuide. Photo by Bart Drees. In 1995, a second species of longhorned borer, Phoracantha recurva, was discovered in Southern California in Los Angeles, Riverside, Orange, and San Bernardino counties. Many insects feed and make their homes in the bark, trunks and branches of shade trees and shrubs. Entries are listed below in alphabetical order. Prionus root borers belong to a family of beetles (Order Coleoptera) commonly known as long-horned beetles (Cerambycidae). Related posts: The attractive green longhorned beetle (Cerambycidae) on gum bumelia. Several species in the Prionus genus are large, root-boring beetles, and they are widely distributed across the U.S. The larvae are often referred to as round-headed borers because their body shape is cylindrical. California Root Borer. 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