[From the Summer issue of the UC IPM Retail Nursery & Garden Center News]
The incurable citrus disease huanglongbing (HLB) has been detected in dozens of backyard trees in Los Angeles and Orange counties and most recently in Riverside. The bacterium that causes this disease is spread from tree to tree by Asian citrus psyllids (Figure 1). HLB, also known as citrus greening, has already devastated the citrus trees in Florida, Georgia, Louisiana, South Carolina, and Texas. There is no known treatment for the disease, which usually kills the tree within three to five.../span>
The following press release was distributed on March 28, 2017 by the Citrus Pest & Disease Prevention Program.
The California Department of Food and Agriculture crews conducting intensive, risk-based surveys detected eight citrus trees confirmed to be infected with Huanglongbing. All trees were in the core area of San Gabriel where HLB has previously been detected. This brings the total number of HLB-positive trees in California to 46.
CDFA routinely conducts HLB surveys throughout the state based on a risk model that considers factors that may make an area more likely to have a presence of the disease. CDFA has further fine-tuned this approach by increasing the number of samples pulled from citrus trees...
The following press release was distributed on October 17, 2016 by the California Department of Food and Agriculture.
Insect that carries disease deadly to citrus trees found in Placer County.
A portion of Placer County has been placed under quarantine for Asian citrus psyllid (ACP) following the detection of multiple life stages on citrus trees within the City of Lincoln.
The quarantine zone in Placer County measures 118 square miles, bordered on the north by Riosa Road; on the south by the Roseville City Limit; on the west by Brewer Road; and on the east by Fowler Road. The quarantine map for Placer County is available online at:
- Author: Jeannette E. Warnert
From the UCANR Green Blog
Scientists are rearing tiny Asian wasps in quarantine and evaluating whether they can be released in California to battle brown marmorated stink bug (BMSB), an invasive pest that poses a serious threat to the state's $54 billion agricultural industry, they reported in the current issue of California Agriculture journal.
The wasp, Trissolcus japonicus, has scientists feeling hopeful, said Chuck Ingels, UC Cooperative Extension advisor in Sacramento...
News release from the California Department of Food and Agriculture (CDFA)
February 3, 2016 - Two additional trees in San Gabriel have tested positive for Huanglongbing. The two trees, an orange and a kumquat, are on separate properties but are both within the core area in San Gabriel where 10 diseased trees were confirmed last summer. Given the close proximity, there will not be a quarantine expansion.
One of the HLB-positive trees has already been removed and California Department of Food and Agriculture officials are in the process of contacting the other homeowner to schedule tree removal. Agriculture officials are working quickly in the area.