- 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.
VOCs are gasses that combine with other substances to form ground level ozone (smog). In an effort to reduce smog in the San Joaquin Valley, as of Nov 1, the Department of Pesticide Regulation (DPR) is restricting sales and use of High-VOC producing ag products during the months of May through October. High-VOC ag products have an emission potential (EP) greater than 35%. For citrus, products of concern include chlorpyrifos, gibberellin, abamectin and oxyfluorfen. There are many formulations of each of these agricultural products and the goal is to choose formulations that keep the EP below 35%. The following link provides a list of the formulations that are above (High-VOC) and below (Low-VOC) the EP threshold of 35% for all crops. Keep this in mind as you purchase and use insecticides, herbicides and gibberellin.
List of High and Low-VOC formulations http://www.cdpr.ca.gov/docs/emon/vocs/vocproj/nonfum_voc_prod_list.pdf
Assemblyman Jim Patterson will be hosting a Citrus Industry Town Hall to discuss Asian Citrus Psyllid and the steps being taken to control its spread in California. The California Department of Food and Agriculture, local government officials and leading citrus researchers will be on hand to provide information and answer any questions. The event is open to all interested persons but space is limited so please RSVP to Assemblyman Patterson’s Fresno office at (559) 446-2029.
Date & Time: Friday August, 23, 2013 | 10:00am
Location: Fresno County Farm Bureau 1274 W Hedges Ave Fresno, CA 93728
Speakers Scheduled to Attend:
- Victoria Hornbaker – CDFA, Program Coordinator
- Dr. Beth Grafton-Cardwell - UC IPM Specialist and Research Entomologist
- Sylvie Robillard - Fresno County Grower Liaison
- Les Wright - Fresno County Ag Commissioner
- Joel Nelsen – California Citrus Mutual, President
California’s Department of Food and Agriculture (CDFA) establishing a quarantine area around the Asian citrus psyllid (ACP) detection sites in Tulare County. It is estimated that there are 11 packing houses and 21,520 acres of commercial citrus that fall within the quarantine area, which is approximately a five mile radius around the detection sites.
All fruit leaving the quarantine area must be cleaned of leaves and stems before it is moved from the quarantine area. At the present time, groves cannot be treated with pesticides as an alternative to cleaning. CDFA has requested approval from USDA’s Animal and Plant Health Inspection Service (APHIS) to implement this option, but APHIS has not approved it as of today. Compliance agreements are required for growers, haulers and packers if fruit is moved from the quarantine area. Parties should contact CDFA’s ACP Exclusion Office in Visalia at (559) 636-7410 for additional information about compliance agreements.
This information is in from Tulare County:
The California Department of Food and Agriculture (CDFA) announced yesterday that six adult Asian citrus psyllids (ACP) were found in three separate Glassy-winged sharpshooter traps in commercial citrus groves in southwest Porterville. The traps were set on June 11 and serviced on June 26. CDFA and Tulare County are establishing an eight square mile intensive trapping zone around the detections to determine if there may be other ACP in the vicinity.
CDFA, USDA/APHIS and County of Tulare will be meeting to determine the appropriate course of action and whether to impose a quarantine zone or other regulatory measures. CDFA will meet Monday (July 15) with the Executive Committee of the Citrus Pest and Disease Management Committee regarding its plans for addressing the infestation.
More information will be provided as it becomes available.