Posts Tagged: avocado
University of California Cooperative Extension & USDA Farm Service Agency
Emergency Avocado & Citrus Post-Wildfire Informational Meeting
We understand this is a difficult time for all of our friends, family and neighbors affected by the devastating Lilac fire. In hopes of providing some assistance and relieving some anxiety, we assembled an informational meeting to provide resources to help growers deal during this overwhelming time.
Date: Tuesday, December 19, 2017
Time: 1:00-4:00 PM
Location: 990 E. Mission Rd, Fallbrook CA 92028, Fallbrook Public Utility Building
There is no cost to attend this event
Please register at: https://ucanr.edu/survey/survey.cfm?surveynumber=22511
1:00- 1:10 - Introduction: Sonia Rios, Subtropical Horticulture Farm Advisor, UCCE Riverside/San Diego
1:10- 1:30- Fire Update and Safety: CAL FIRE
1:30- 2:00- Post Fire Tree Care- Gary Bender, Emeritus, Subtropical Horticulture Farm Advisor, UCCE San Diego
2:00- 2:20 Post Fire Tree Economics- Eta Takele, Agriculture Economics Advisor, UCCE Riverside
2:30-3:30-Desiree Garza, USDA Farm Service Agency
3:30: 3:55- Preventative Fire Safety for Orchard Systems-Sonia Rios, Subtropical Horticulture Farm Advisor UCCE Riverside/San Diego Co.
3:55 Conclude Meeting
Will also be in attendance: Eric Klein, Dept. of Environmental Health, Debra Lorenzen, Community Recovery Team, and other resource agency's will be in attendance.
Light drinks and refreshments will be served
If you have any questions, please feel free to call: Sonia Rios, 951-683-6491 ext. 224
At a recent meeting for current and prospective avocado growers near Visalia, Yosepha Shahak a retired researcher from Israel's Volcani Institute presented information on photo-selective netting. This netting was an outgrowth of netting that is used in the Mediterranean region to protect crops from frost damage and the unpredictable hail storms that can occur just as fruit might be coming to harvest. Netting is currently used in commercial orchards and vineyards throughout Europe. San Joaquin Valley growers like the idea of frost protection.
Netting over loquats (nespero) in Spain (Espana)
Netting over apples in Australia
Netting for light modification in Israel. Tractors can work here.
Photo-selective netting refers to covering crops by nets having the capacity to selectively filter the intercepted solar radiation, in addition to their protective function. The technology is based on plastic net products into which light dispersive and reflective elements are introduced during manufacturing. These nets are designed to screen various spectral bands of the solar radiation, and/or transform direct light into scattered light. The spectral manipulation intends to specifically promote desired physiological responses, which are light-regulated, while the scattering improves the penetration of the modified light into the inner plant canopy. So, depending on the crop, more and better fruit set, bigger fruit and some other desirable properties. The netting can also substantially reduce evaporative demand and wind damage. This can lead to not only lower water use, but also such water stress related diseases, such as blight caused by Botryosphaeria fungi. Lower evaporative demand and less water application can lead to less salt damage.
A recent additional aspect to the photo-selective nets refers to their effects on pest behavior. The photo-selective netting concept was developed and tested in Israel in ornamental, vegetable and fruit tree crops. It is gradually spreading all over the world, for implementation in different crops, climatic regions and cultivation methods. Applying it to avocado orchards is going to require pruning and keeping trees so that they can be picked and pollinated. And would probably lead to high density orchards.
And how we do pest management – more or less, and maybe not by helicopter?
This might also be the future for how citrus is grown in an HLB environment. 24 sprays a year to control ACP in Florida -Yikes.
A link to a Shahak talk that she gave to Washington state apple growers can be found at:
The destruction after a fire can be pretty gruesome and sad. Many times, though the fire moves through the orchard so fast that, even though the canopy has turned brown, there is a good chance the trees can come back. It all depends on how much damage has been done to the trunk. If the fire has substantially damaged the base of the trunk, it is unlikely to come back, even if the canopy is still green. That is the saddest thing, because you think you've dodged the bullet, but if the trunk is too damage, the canopy collapses gradually over a few weeks. However, the canopy may look a goner, but if the trunk is still intact, the tree will come back and may still be as productive as before.
The thing to look for at the base of the trunk is the discoloration. If it's black, it's probably not coming back. However, it can come back if after a few weeks you don't see the pencil-sized cankers that indicate that the sap has bubbled to the surface (see photo 1 below). If after a few weeks, the trunk is still clear of those bubbles (photo 2), even though the canopy looks gone, it is quite likely to come back.
It's also possible that the trunk may be damage in just one part of the trunk and not on the rest. In this case, it can also come back. The problem with these ones, is that they may come back and given enough time will be good trees again. But if they haven't recovered enough and there's a sudden heat spell, they may go down suddenly as if they had been burned again. That's the way they will look, like they have been burned again. Given enough time, though the avocado will grow from good areas to cover the poor areas and the tree may be productive again.
Avocados are amazing in their ability to recover. Eucalyptus can do it. But you singe the trunk of a lemon, and good-bye lemon.
Photo 1 and 2.
Spread sheets to help you calculate loss
Information from Ben Faber, Soils and Water, Avocado and Minor Subtropicals Advisor
Information on how to care for fire damaged trees from Ben Faber, Soils and Water, Avocado and Minor Subtropicals Advisor
Information on fire ecology and fire safe landscaping for homeowners, developed by Sabrina Drill, Natural Resources Advisor
Information on fire science from UC experts. Includes information on how to make homes and other structures more fire resistant, developed by Steve Quarles, Statewide Wood Performance and Durability Advisor
Local Fire Departments - have regulatory information you may need
Publications Available From University of California ANR Catalog
You can find the publications listed below at theUniversity of California DANR Catalog site (In the ANR Search type fire) and order more than one publication at a time or you may click on one of the links below.if you purchase a priced publication enter the promotion code PRVEN56 at check-out. You'll receive a 10% discount on your order, and a portion of the sales will benefit local programs.
A Property Owner's Guide to Reducing Wildfire Threat - describes ways homeowners can reduce the threat of fire to their property. Cost $1.50
Home Landscaping for Fire - Incorporating fire safe concepts into your landscape is one of the most important ways you can help your home survive a wildfire. FREE
Landscaping Tips to Help Defend Your Home from Wildfire - You can have both a beautiful landscape and a defensible fire-safe zone. FREE
Recovering from Wildfire - discusses issues that family forest landowners should consider following a wildfire. Cost $5.00
WildFire: How Can We Live With It? (DVD) - This program contains general information about wildland fire in California. Cost $20.00
Companion Set: How Can We Live with Wildland Fire? (Publication and DVD) - What role does fire play in the natural cycle and what choices can we make about coping with wildland fire? Cost $27.50
How Can We Live with Wildland Fire? - What role does fire play in the natural cycle and what choices can we make about coping with wildland fire? Cost $10.00