On March 6, a nursery inspection program begins in Southern California. A pilot program starts March 16 in Temecula to treat citrus to reduce movement of GWSS into grape vineyards. CDFA and the American Vineyard Foundation also contribute funds to the project. On May 8, a single GWSS is found in a nursery east of Lodi in San Joaquin County. On May 11, three GWSS are found in the Tulare County town of Porterville.
Additional surveys reveal at least three square miles to be infested.
CDFA Secretary Lyons appoints members to the Pierce's Disease Science Advisory Panel. The panel convenes June 1 to review proposed treatment for the Porterville infestation. An infestation is found in the city of Fresno. Treatment begins in Porterville June 20 on more than 300 infested properties. On June 27, treatment commences on about 55 properties in the Sunnyside area of Fresno.