A new species of beetle is affecting California ornamental trees.

There is a new invasive species in California infecting ornamental trees and avocado orchards in Los Angeles and Orange County. Researchers believe the Polyphagous Shot Hole Borer (Euwallacea sp.) is the new species and is of the Asian ambrosia beetle. This pest is the size of a sesame seed, but it can take down limbs and whole trees as it feeds on cambium and phloem while spreading Fusarium Dieback (Fusarium sp.) I recently attended an emergency meeting where researchers recommended Onyx® insecticide (bifenthrin) and some systemic insecticides for control. However, I am hearing that the systemics are not working and people are recommending Onyx. FMC Professional Solutions formulated Onyx insecticide as a preventive treatment for reliable, long-term protection against beetles and borers. It also controls a wide spectrum of insects and mites on trees, shrubs, foliage plants, non-bearing fruit and nut trees and flowers in outdoor plantscapes. Onyx mixes readily with water and other aqueous carriers and may be tank-mixed with other products including insect growth regulators. Since Onyx is an EC (emulsifiable concentrate), the following procedure is recommended for preparation of a new tank mix, unless specified otherwise in label directions: Add wettable powders to tank water Agitate Add liquids and flowables Agitate Add emulsifiable concentrates Agitate. Read the Onyx label for more information on tank mixing troubleshooting ideas. For preventative control: Make applications of a spray mixture containing 1 to 2 pints (16 to 32 fl oz) of Onyx per 100 gallons (0.25 to 0.5 lbs. ai/100gallons) of water to the trunk, scaffolding and limbs of the tree with a hydraulic sprayer in the early spring or...