The Situation: Since 1850, eucalyptus trees of >90 species have been imported as seed from Australia into California for a wide range of ornamental and other uses. Eucalyptus are now an ubiquitous plant in urban areas in southern California, and these plants are becoming increasingly more common in California’s natural areas too where some species...

The Situation: Asian citrus psyllid (ACP) is an efficient vector of the bacterial citrus disease huanglongbing (HLB), previously called citrus greening disease, which is one of the most destructive diseases of citrus worldwide. In the United States, the psyllid vector is found in Florida, Mexico, Louisiana, Georgia, South Carolina, Cuba, Belize and the Yucatan peninsula...

The Situation: The glassy-winged sharpshooter (GWSS), likely introduced from the southeastern U.S. as eggs on nursery stock, was first observed in Orange and Ventura counties in California in 1989. It has a large plant-host range and is especially abundant on citrus. Damage: GWSS feeds on plants through straw-like mouthparts inserted into the xylem tissue which...

The Light Brown Apple Moth, The situation: Light brown apple moth (LBAM) is a tortricid leafroller approximately ¼ inch in length that roll leaves into shelters. LBAM is native to Australia and has established in New Zealand, Hawaii, Ireland, New Caledonia and Great Britain. In March 2007, the presence of LBAM was confirmed in California...

The Situation: An exotic long-horned beetle was first discovered attacking ornamental trees in New York City and Chicago. Detections of this pest have since been made in most states in the northeastern portion of the United States as well as in California beginning in 1996. Their route of entry into the USA appears to have...