1. Skirt pruning
2. Weed control under the tree to prevent bridging between the ground and the tree skirt
3. Apply at least one foliar spray to knock down adult populations
Following finds of several adults in yellow sticky cards in a residential area of Dinuba, young trees infested with all stages of psyllids were discovered nearby. The fact that all stages were found and the trees were young, suggests that the trees could have been infested when they were planted and the trees possibly came from outside the San Joaquin Valley or the infestation got started near these young trees a while ago (this is being investigated). This situation points out the need to educate everyone that they must never move plant material from ACP-infested areas that are under quarantine to areas such as the San Joaquin Valley where the pest has not yet established. Treatments of residences and commercial orchards in the area of the Dinuba finds have been initiated. See www.ucanr.edu/sites/acp for more information on where psyllids are found statewide and what to do to manage ACP from the grower and homeowner perspective.
Press Release from Tulare County Ag Commissioners office
NEW TULARE COUNTY ASIAN CITRUS PSYLLID DETECTIONS IN DINUBA
TULARE, September 11, 2013 – The Tulare County Agricultural Commissioner, in cooperation with the California Department of Food and Agriculture and the United States Department of Agriculture are conducting an extensive survey and treatment program in response to new detections of Asian citrus psyllids (ACP) within the City of Dinuba in Tulare County.
Numerous ACP adults and nymphs (young ACPs) have been confirmed in the area. Treatment has begun and will be carried out on all citrus plants within 800 meters surrounding the site where the insects were trapped. Residents in the treatment area will be notified in advance.
The ACP is an invasive species of grave concern because it can carry the disease huanglongbing (HLB). All citrus and closely related species are susceptible hosts for both the insect and the disease. There is no cure once a tree becomes infected. The diseased tree will decline in health and produce bitter, misshaped fruit until it dies. To date, HLB has only been detected on one property in the Hacienda Heights neighborhood of Los Angeles County.
“We want to emphasize citrus fruit is safe to eat and the disease is not harmful to human health,” said Tulare County Agricultural Commissioner Marilyn Kinoshita. “The Asian citrus psyllid is another example of the many invasive species that enter our state every year.”
Residents in the area who think they may have seen the pest are urged to call the Pest Hotline at 1-800-491-1899 or the Tulare County Agricultural Commissioner. For more information on the Asian citrus psyllid and huanglongbing disease visit: http://www.cdfa.ca.gov/plant/acp/.
DPR issued a special local need effective September 9, 2013 that allows the use of Brigade WSB on citrus trunks at the 5 lb product (0.5 lb ai/acre) rate for Fuller rose beetle. The SLN allows two treatments of 5 lbs applied 12-16 weeks apart OR four treatments of 2.5 lbs applied 6-8 weeks apart. The SLN allows the use of either a hand wand sprayer or shielded sprayer to apply the treatment to the lower 18 inches of skirt-pruned tree trunks. This SLN provides a higher rate and an additional method of application - which should improve control of Fuller rose beetle. Dr. Joseph Morse and Dr. Beth Grafton-Cardwell are conducting field trials to determine the best combination of treatments (skirt pruning, trunk treatments, foliar treatments) to prevent Fuller rose beetle from laying eggs under the calyx of fruit. Korea is allowing Methyl Bromide fumigation this year, but is definitely not allowing it next year. So it is important to continue to treat for Fuller rose beetle this season to drive the beetle populations down and make control easier next year.
I received the following update from the California Citrus Qualilty Council. This is exciting news, since Fuller rose beetle is so difficult to completely eliminate from orchards. Please note that even though Korean officials are allowing MeBr fumigation this season, they still expect to see reductions in Fuller rose beetle interceptions. In addition, since fumigation is likely only a temporary situation, growers would be wise to continue treatments for FRB this season to reduce populations for future seasons.
California Citrus Industry,
USDA’s Animal and Plant Health Inspection Service (APHIS) officials confirmed this morning that their counterpart agency in Korea agreed to an additional year of blanket fumigation for California citrus. While Korea’s Quarantine Inspection Service (QIA) agreed to provide an extension of the methyl bromide treatment in Korea, they stated that they expect to see reductions in Fuller rose beetle (FRB) interceptions and periodic updates on the progress of research on FRB mitigation measures.
This new development removes the uncertainty regarding citrus shipments to Korea for the 2013-14 season.
Additional information will be provided at the California Citrus Quality Council’s (CCQC) Korea export program preseason meeting, which will be held at the Visalia Convention Center at 9:00 a.m. on Sept. 26.
- Author: Jodi Azulai
- Contributor: Elizabeth E Grafton-Cardwell
To accurately time insecticide treatments see the new UC IPM online presentation about using degree-days for pests in fruit and nut trees. While we can’t control heat waves such as the recent one, we can measure daily temperatures to protect our orchards from several important insect pests such as California red scale, navel orangeworm, San Jose scale, orange tortrix, and codling moth.
Using degree-days to time treatments allows you to reduce insecticide use by targeting the most susceptible insect stage, attaining maximum control and reducing costs. Monitoring and using degree-days allows for the correct application timing of reduced-risk products preserving many of the parasites and predators that control other orchard pests.
Walt Bentley, retired UC IPM Advisor, narrates the 15-minute presentation and explains the basics using stone fruit and nut pest examples:
- How heat influences insect development
- What a degree-day is
- How degree-days accumulate
- What data is needed to calculate degree-days
- The benefits of using degree-days to time insecticide treatments
The presentation can be accessed on the UC IPM degree day website: http://www.ipm.ucdavis.edu/WEATHER/index.html.
In the future, look forward to a second degree-day presentation on how to use UC IPM Web site tools and information for calculating degree-days.