If you see significant leaf drop in your groves due to excessive heat, the following actions are recommended:
- As soon as possible, whitewash branches exposed to the sun with special attention paid to branches on the west and south sides of the tree.
- Trees that lose a significant portion of leaves cannot efficiently move water, therefore restrict irrigation amounts to ensure you avoid creating wet, soggy conditions that can lead to root rot. It's best to irrigate less frequently and with smaller amounts of water.
- Do not prune your trees — leave hanging leaves in place to protect the tree from sunburn. Once new tree growth has occurred (in the next 3 – 6 months), pruning can take place on living wood.
- Adjust fertilization as you would with a frost-damaged tree: reducing the amount of fertilizer until the tree is re-established. If you see signs of a particular nutrient deficiency, adjust fertilization accordingly.
For more information about managing heat in avocado groves, growers can view the following articles on the California avocado growers' website:
- Author: Mike Hsu
Much of California is experiencing high temperatures with predictions of extended high heat through next week, so this is a good time to review heat safety information and recommendations.
Please take appropriate heat illness prevention measures throughout the holiday weekend and beyond, especially those who are working or spending time outdoors. You can find UC ANR information and resources about preventing heat illness at https://ucanr.edu/sites/ucanr/News/Heat/ and https://safety.ucanr.edu/Programs/Heat_Illness_Prevention/.
For current weather alert information, Cal/OSHA recommends the NOAA Weather Alerts page at: http://alerts.weather.gov/cap/ca.php?x=1
Cal/OSHA sent a reminder for employers to protect outdoor workers from heat illness that offers the following recommendations:
- Plan – Develop and implement an effective written heat illness prevention plan that includes emergency response procedures.
- Training – Train all employees and supervisors on heat illness prevention.
- Water – Provide drinking water that is fresh, pure, suitably cool and free of charge so that each worker can drink at least 1 quart per hour and encourage workers to do so.
- Rest – Encourage workers to take a cool-down rest in the shade for at least five minutes when they feel the need to do so to protect themselves from overheating. Workers should not wait until they feel sick to cool down.
- Shade – Provide proper shade when temperatures exceed 80 degrees. Workers have the right to request and be provided shade to cool off at any time.
- Author: Pamela Kan-Rice
September is National Preparedness Month, designated to encourage disaster and emergency readiness. To help Californians prepare for extreme heat, earthquakes, public safety power shutoffs and wildfire, University of California Cooperative Extension has created a disaster preparedness website organized for quick access to critical information.
The website https://ucanr.edu/Disaster contains fact sheets with tips for getting prepared.
“Unfortunately, with a warming climate, we are facing more and more extreme climate-related events such as heat waves, wildfires, power shutoffs and storms. All Californians need to step up their preparedness efforts to be ready to meet this more uncertain future,” said Susan Kocher, UC Cooperative Extension forestry advisor, who co-authored the disaster preparedness resources for the website.
The fact sheet for extreme heat events offers suggestions for avoiding heat exposure, such as identifying nearby cooling centers and covering windows to keep heat out. It also suggests things to do during hot weather such as staying hydrated, taking cool showers and keeping pets indoors. It describes symptoms of heat-related illnesses, which can have serious health effects.
Public Safety Power Shutoff
During extreme weather events, electrical power in high fire-threat areas may be shut off to prevent sparking. This precaution is known as a Public Safety Power Shutoff. A PSPS is most likely to occur from May to November, when conditions are the hottest and driest.
UC Cooperative Extension recommends signing up to receive PSPS alerts from your energy company. Experts also advise making a plan for medications that need to be refrigerated or medical devices that require power. To prevent foodborne illness, they offer suggestions for ensuring food safety during and after a power outage.
Wildfire and smoke
Wildfire smoke can harm your health. During wildfires, UC Cooperative Extension recommends wearing an N95 outdoors to reduce smoke exposure and taking steps to prevent smoke from entering buildings. To reduce wildfire risk, the website describes methods of removing flammable vegetation around homes.
UC Cooperative Extension offers safety tips for before, during and after an earthquake. Identifying the safest place in your home during an earthquake in advance is helpful. For example, doorways are not the safest place to be in modern homes. Experts recommend crawling under a sturdy desk or table, while avoiding areas next to windows, beneath ceiling fixtures or near large items that may fall during an earthquake.
The website also offers resources on drought, food safety after a fire, and wildfire preparedness and recovery.
In 2020 and 2021, Cooperative Extension researchers from around the country held listening sessions with community members who had experienced extreme weather events and other types of disasters to learn what had worked well, what had not, and how communities could be strengthened.
In response, these disaster resources were developed by Kocher, UC Davis undergraduate student Caydee Schweitzer, Tracy Schohr, UC Cooperative Extension livestock and natural resource advisor, and Vikram Koundinya, UC Cooperative Extension evaluation specialist. The group plans to add fact sheets on more disaster topics in the future.
This project was funded by a USDA National Institute of Food and Agriculture Renewable Resources Extension Act grant.
MEDIA CONTACT: Susan Kocher, UC Cooperative Extension forestry advisor, firstname.lastname@example.org/h3>/h3>/h3>/h3>
Heat Mitigation Around the World
A chance to hear what can and is being done by growers
to reduce the damage inflicted on avocado fruit and trees
World wide Speakers:
California Avocado Growers Seminars Series 2022
from CA Avocado Society/CA Avocado Commission/University of CA Cooperative Extension
June 15 (9 - 11 AM)
Heat Mitigation Around the World
Dealing with Hot Times in the Avocado Orchard: What is done by others to mediate Heat.
World wide Speakers:
Don't Let Your Trees Look Like This!!!!!!!!!!!!/span>/h2>/h3>