- Author: Devii Rao
Title: Area Livestock and Natural Resources Advisor
Specialty: Rangeland Ecology and Management, Rangeland Conservation, Grazing Management, Conservation of Biological Diversity, Watershed Protection and Management.
County: San Benito County
Address:
Cooperative Extension San Benito County
3228 Southside Road
Hollister, CA 95023
Phone: 831-637-5346 x14
Email: drorao@ucanr.edu
Do you have yellow starthistle, Italian thistle, Himalaya blackberry, white top, or other common Central Coast rangeland weeds on your ranch? If so, you may be wondering which herbicides are most effective, how much they cost, what is required to purchase and spray a particular herbicide, when to spray, whether the herbicide affects grasses or clovers, and if the herbicide is safe for your livestock and pets. Many Central Coast rangeland landowners have been asking these same questions. So, I compiled this information in two tables. Table 1 shows some of our common rangeland weeds and different herbicide treatment options. Table 2 lists six of the most commonly used rangeland herbicides, and answers questions about cost, when to spray, purchasing requirements, affected plants, and grazing/pet restrictions. All of this information is already available from a variety of sources, but I have put it together in two easy to use reference tables. The tables are self-explanatory for the most part, but the information below may clarify a few things.
Integrated Pest Management (IPM)
IPM is a weed management approach that uses multiple control methods. Control methods could include mechanical control, manual control, grazing, seeding, herbicide, etc. The most effective options will depend on the particular species you are trying to control. This blog post focuses on herbicide because I am often asked about chemical treatment options. However, your weed control efforts will likely be most successful if you use a variety of methods.
Operator ID's, Restricted Materials Permits, & Private Applicator Certificates
Most of the herbicides in Table 2 are general use pesticides, meaning that you only need an operator ID to purchase and use them (Carbonaro, pers. comm.). Operator ID's are free and can be obtained from your County Agricultural Commissioner's office. No test is required. But, you'll need to show a property map in order to get your operator ID.
One herbicide in Table 2, 2, 4-D, is a California state restricted pesticide when applied on rangelands. Before you can purchase or spray California state restricted pesticides, two things are required: a Private or Commercial Applicator Certificate and a restricted materials permit. You can get a Private Applicator Certificate from your County Ag Commissioner's office. This requires taking a free test. The test is based on Pesticide Safety: A Reference Manual for Private Applicators, 2nd Ed., published by the University of California. This book can be purchased from most County Ag Commissioner or UC Cooperative Extension offices or online at: http://anrcatalog.ucanr.edu/Details.aspx?itemNo=3383. Once you have your Private Applicator Certificate you'll be able to obtain a restricted materials permit, again from your County Ag Commissioner's office. Alternatively, you can hire a licensed pest control business to purchase and spray California state restricted pesticides.
Read Labels, Follow Federal, State & Local Regulations, and Report Pesticide Use to Your County Ag Department
Although Table 2 includes information from the herbicide labels, it is not a substitute for reading the entire herbicide label before you spray (Carbonaro, pers. comm.). Always read the label before using any of these herbicides. In California, in addition to following the label, applicators will also need to follow federal, state, and local regulations. And, remember that you should submit a pesticide use report to your County Agricultural Commissioner's office for all pesticides used on rangelands.
For additional information about weeds and how to manage them, check out this website: http://wric.ucdavis.edu. The Invasive Thistles of Bay Area Counties & Herbicides for Controlling Thistles Handout compiled by Guy Kyser, UC Cooperative Extension Specialist in Weed Science at UC Davis is a great resource and is attached at the bottom of this blog post.
References
Carbonaro, D. 2017. Personal communication, 4/16/2017. Carbonaro is a Senior Biologist/Inspector with the San Benito County Agricultural Commissioner's Office.
DiTomaso, J.M. G.B. Kyser et al. 2013. Weed Control in Natural Areas in the Western United States. WRIC, UC.
Kyser, G. Unpublished. Invasive Thistles of Bay Area & Herbicides for Controlling Thistles.
Table 1. Common Central Coast Rangeland Weeds
PlantSpecies |
Herbicides Options Approved for useon CaliforniaRangelands |
Rangeland Herbicides Known to beEffective |
|
Bullthistle (Cirsium vulgare) |
2, 4-D (Severalnames) Aminopyralid(Milestone) Clopyralid(Transline) Dicamba (Banvel,Clarity) Triclopyr (Garlon 3A/Garlon 4Ultra)Chlorsulfuron(Telar) Imazapyr (Arsenal,Polaris) |
Milestone, Transline, Capstone (=Milestone + Garlon),Garlon, Roundup (Kyser,unpublished)
2,4-D is often used because it is inexpensive. However, itis not as effective as otherherbicides. |
|
Bull thistle weed report: |
http://wric.ucdavis.edu/information/natural%20areas/wr_C/Cirsium_vulgare.pdf |
||
Cocklebur (commonand spiny cocklebur) (Xanthium strumarium) (Xanthium spinosum) |
2, 4-D (Severalnames) Aminopyralid(Milestone) Clopyralid(Transline) Dicamba (Banvel,Clarity) Fluroxypyr (VistaXRT) Triclopyr (Garlon 4 Ultra, RemedyUltra)Glyphosate (Roundup, Accord XRT II,and others) Imazapyr (Arsenal,Polaris) Sulfosulfuron(Outrider) |
Aminopyralid(Milestone) Clopyralid(Transline) |
|
Cocklebur weed report: |
http://wric.ucdavis.edu/information/natural%20areas/wr_X/Xanthium_spinosum-strumarium.pdf |
||
Fiddleneck (Menziesandcoastfiddleneck) (Amsinckiamenziesii)(Amsinckia menziesiivar. intermedia) |
Aminopyralid(Milestone) Glyphosate (Roundup, Accord XRT II,and others) Chlorsulfuron(Telar)Imazapyr (Arsenal,Polaris) Sulfosulfuron(Outrider)Hexazinone (VelparDF) |
Aminopyralid(Milestone) Chlorsulfuron(Telar) |
|
Fiddleneck weedreport: |
http://wric.ucdavis.edu/information/natural%20areas/wr_A/Amsinckia.pdf |
Foxtail (Mediterraneanand harebarley) (Hordeum marinumssp.gussonianum) (Hordeum murinumssp.leporinum) |
Glyphosate (Roundup, Accord XRT II,and others) Imazapyr (Arsenal,Polaris) Rimsulfuron(Matrix) Sulfometuron + chlorsulfuron(LandmarkXP) Sulfosulfuron(Outrider)Hexazinone (VelparL) |
Glyphosate (Roundup, Accord XRT II, and others) iseffective, but is nonselective, so will kill most other plants as well.If glyphosate is to be used, reseed to reduce bare groundand encroachment of other weedspecies.
Rimsulfuron (Matrix) will likely control control foxtail,based on limiteddata. |
Foxtail weedreport: |
http://wric.ucdavis.edu/information/natural%20areas/wr_H/Hordeum_marinum-murinum.pdf |
|
Frenchbroom (Genista monspessulana) |
Triclopyr (Garlon 3A, Garlon 4Ultra,PathfinderII) Aminopyralid + triclopyr(Capstone) Triclopyr + 2,4-D(Crossbow) Glyphosate (Roundup, Accord XRT II,and others) Imazapyr (Arsenal,Polaris) |
Triclopyr (Garlon 3A, Garlon 4 Ultra, PathfinderII)
Glyphosate (Roundup, Accord XRT II, and others) iseffective, but resprouts will need to be controlled. Glyphosateis nonselective, so will kill most other plants as well. Ifglyphosate is to be used, reseed to reduce bare groundand encroachment of other weedspecies. |
French broom weedreport: |
http://wric.ucdavis.edu/information/natural%20areas/wr_G/Genista.pdf |
|
Goatgrass (jointed and barbgoatgrass) (Aegilops cylindrica) (Aegilops triuncialis) |
Glyphosate (Roundup, Accord XRT II,and others) Sulfometuron + chlorsulfuron(LandmarkXP) |
Research is currently being conducted to identify most effective options for goatgrass. |
Goatgrass weedreport: |
http://wric.ucdavis.edu/information/natural%20areas/wr_A/Aegilops_cylindrica-triuncialis.pdf |
Himalayablackberry (Rubus armeniacus) |
Dicamba (Banvel,Clarity) Fluroxypyr (VistaXRT) Triclopyr (Garlon 3A, Garlon 4Ultra,PathfinderII) Aminopyralid + triclopyr (Capstone) Glyphosate (Roundup/Accord XRT II,and others) Hexazinone (VelparL) Tebuthiuron(Spike) |
Triclopyr (Garlon 3A, Garlon 4 Ultra, Pathfinder II) canbe effective on smallindividuals.
Glyphosate (Roundup/Accord XRT II, and others) canbe effective, but may requireretreatment. |
Himalaya blackberry weed report: |
http://wric.ucdavis.edu/information/natural%20areas/wr_R/Rubus.pdf |
|
Italian thistle (Carduus pycnocephalus) |
2, 4-D (Severalnames) Aminopyralid(Milestone) Aminopyralid + 2,4-D (ForefrontHL) Aminopyralid + triclopyr(Capstone) Clopyralid(Transline) Dicamba (Banvel,Clarity) Fluroxypyr (VistaXRT) Triclopyr (Garlon 3A, Garlon 4Ultra)Triclopyr + 2,4-D(Crossbow) Glyphosate (Roundup, Accord XRT II,and others) Chlorsulfuron(Telar)Imazapyr (Arsenal,Polaris) Hexazinone (VelparL) |
Aminopyralid (Milestone) is highly effective on thistles.
Milestone, Transline, Capstone (=Milestone + Garlon),Garlon, Roundup (Kyser,unpublished)
2,4-D is often used because it is inexpensive. However, itis not as effective as otherherbicides. |
Italian thistle weedreport: |
http://wric.ucdavis.edu/information/natural%20areas/wr_C/Carduus_acanthoides-nutans-pycnocephalus-tenuiflorus.pdf |
Medusahead (Taeniatherumcaput -medusae) |
Aminopyralid(Milestone) Glyphosate (Roundup, Accord XRT II,and others) Rimsulfuron(Matrix) LandmarkXP |
Aminopyralid (Milestone) provided up to 90% controlof medusahead based on research in the CentralValley. |
Medusahead weedreport: |
http://wric.ucdavis.edu/information/natural%20areas/wr_T/Taeniatherum.pdf |
|
Milkthistle (Silybum marianum) |
2, 4-D (Severalnames) Aminopyralid(Milestone) Clopyralid(Transline) Dicamba (Banvel,Clarity) Chlorsulfuron(Telar)Rimsulfuron(Matrix) |
Milestone, Transline, Capstone (=Milestone + Garlon),Garlon, Roundup (Kyser,unpublished) |
Milk thistle weedreport: |
http://wric.ucdavis.edu/information/natural%20areas/wr_S/Silybum.pdf |
|
Purple starthistle (Centaurea calcitrapa) |
2, 4-D (Severalnames) Aminopyralid(Milestone) Clopyralid(Transline) Dicamba (Banvel,Clarity) Glyphosate (Roundup, Accord XRT II,and others) Hexazinone (VelparL) |
Milestone, Transline, Capstone (=Milestone + Garlon),Garlon, Roundup (Kyser,unpublished) |
Purple starthistleweed report: |
http://wric.ucdavis.edu/information/natural%20areas/wr_C/Centaurea_calcitrapa-iberica.pdf |
Tumbleweed(Russian thistle) (Salsola tragus) |
2, 4-D (SeveralNames) Aminocyclopyrachlor +Aminopyralid(Milestone) Dicamba (Banvel,Clarity) Triclopyr (Garlon 3A, Garlon 4Ultra)Glyphosate (Roundup, Accord XRT II,and others) Chlorsulfuron(Telar)Imazapyr (Arsenal,Polaris) Hexazinone (VelparL) |
Research is currently being conducted to identify most effective options fortumbleweed. |
Tumbleweed weedreport: |
http://wric.ucdavis.edu/information/crop/natural%20areas/wr_S/Salsola_paulsenii-tragus.pdf |
|
Whitetop/hell weed (Cardaria draba) |
2, 4-D (Severalnames) Dicamba + 2,4-D Glyphosate (Roundup, Accord XRT II,and others Chlorsulfuron(Telar)Imazapyr (Arsenal,Polaris) |
Chlorsulfuron (Telar) is one of the best control optionsfor plants in the Cardariagenus.
2,4-D is often used because it is inexpensive. However, itis not as effective as otherherbicides. |
Whitetop weedreport: |
http://wric.ucdavis.edu/information/natural%20areas/wr_C/Cardaria_chalepensis-draba-pubescens.pdf |
|
Yellowstarthistle (Centaurea solstitialis) |
2, 4-D (Severalnames) Aminopyralid(Milestone) Clopyralid(Transline) Dicamba (Banvel,Clarity) Triclopyr (Garlon 3A, Garlon 4Ultra)Glyphosate (Roundup, Accord XRT II,and others) Chlorsulfuron(Telar)Imazapyr (Arsenal,Polaris) Hexazinone (VelparL) |
Aminopyralid (Milestone) is the best option to controlyellow starthistle.
Clopyralid (Transline) is also veryeffective.
Glyphosate (Roundup, Accord XRT II, and others) is thebest option in the lateseason. |
Yellow starthistleweedreport: |
http://wric.ucdavis.edu/information/natural%20areas/wr_C/Centaurea_solstitialis.pdf |
Table 2. Commonly Used Rangeland Herbicides, Including When and How to Use Them
Chemical Name/Product Name1 |
Price2* |
Registered for useonCalifornia rangelands3 |
Requirements to Purchase/Spray Herbicide3 |
Preemergent/ Postemergent1 |
Best time tospray4 |
TargetedPlants4 |
Triclopyr(Garlon 3A/Garlon 4Ultra,Remedy Ultra,PathfinderII) |
$70/gallon |
Yes |
Operator ID# |
Postemergent |
Spray after all of theweed seed has germinated,but before the plants getbig. |
Kills broadleaves, but not grasses
Killsclovers5 |
Aminopyralid(Milestone) |
$300/gallon |
Yes |
Operator ID# |
Preemergentand postemergent |
January -March |
Kills thistles andlegumes, and some otherbroadleaves, but notgrasses
Killsclovers5 |
Glyphosate (Roundup, Accord XRT II, and others) |
$21/gallon |
Yes |
Operator ID# |
Postemergent |
Spray after all of theweed seed has germinated,but before the plants getbig. |
Kills any greenvegetation. Tree leaves can be sprayed, but it will not be effectiveifsprayed on treetrunks. |
Chemical Name/Product Name1 |
Price2* |
Registered for useonCalifornia rangelands3 |
Requirements to Purchase/Spray Herbicide3 |
Preemergent/ Postemergent1 |
Best time tospray4 |
TargetedPlants4 |
Chlorsulfuron (Telar) |
$21/ounce |
Yes |
Operator ID# |
Preemergent, can also be usedas postemergent |
Spray around the timeof the first rains, a littlebefore or a little afterthe first rains is fine.Spraybefore seedilngs getbig. |
Check label for plants affected. This herbidiceisspecies specific. Although,itis generally safe on grasses1.
Killsclovers5 |
Clopyralid(Transline) |
$170/gallon |
Yes |
Operator ID# |
Postemergent |
Spray after all of theweed seed has germinated,but before the plants getbig. |
Kills thistles and legumes,but notgrasses
Killsclovers5 |
2, 4-D (DMA4IVM, Weedar 64and manyothers) |
2, 4-D Amine- $13/gallon2, 4-D Ester- $19/gallon |
Yes |
Restricted materialspermit and applicator certificate |
Postemergent |
Spray after all of theweed seed has germinated,but before the plants getbig. |
Kills broadleaves, but not grasses
Killsclovers5 |
Triclopyr(Garlon 3A/Garlon 4Ultra,Remedy Ultra,PathfinderII) |
"Grazing green forage: There are no grazing restrictions for livestock or dairy animals on treated areas...Haying (harvesting ofdried forage): Do not harvest hay for 14 days after application...Slaughter Restrictions: During the season of application, withdrawlivestock from grazing treated grass at least 3 days before slaughter...Livestock Use of Water from Treatment Area: There are no restrictionson livestock consumption of water from the treatmentarea." Herbicide Label:https://s3-us-west-1.amazonaws.com/www.agrian.com/pdfs/Garlon_3A_Label1i.pdf |
Aminopyralid(Milestone) |
"Grazing and Haying Restrictions: There are no restrictions on grazing or grass hay harvest following application of Milestone atlabeledrates. Cutting hay too soon after spraying weeds will reduce weed control. Wait 14 days after herbicide application to cut grass haytoallow herbicide to work. Do not transfer grazing animals from areas treated with Milestone to areas where sensitive broadleafcrops occur without first allowing 3 days of grazing on an untreated pasture. Otherwise, urine and manure may contain enoughaminopyralidto cause injury to sensitive broadleaf plants...For applications on rangeland and permanent grass pastures (not harvested for hay)andnon-cropland areas, do not enter or allow worker entry into treated areas until sprays have dried...Grazing Poisonous Plants:Herbicideapplication may increase palatability of certain poisonous plants. Do not graze treated areas until poisonous plants are dry andnolonger palatable to livestock...Hay from grass treated with Milestone within the preceding 18-months can only be used on the farmor ranch where the product is applied unless allowed by supplemental labeling." Check label for specific restrictions on moving hay,or using hay for silage,etc. Herbicide Label:https://s3-us-west-1.amazonaws.com/www.agrian.com/pdfs/Milestone_Label1h.pdf |
Glyphosate (Roundup, Accord XRT II, and others) |
"DOMESTIC ANIMALS: This product is considered to be relatively nontoxic to dogs and other domestic animals; however, ingestionof this product or large amounts of freshly sprayed vegetation may result in temporary gastrointestinal irritation (vomiting, diarrhea,colic, etc.). If such symptoms are observed, provide the animal with plenty of fluids to prevent dehydration. Call a veterinarianifsymptoms persistfor morethan24hours...Donotfeedor grazeturfgrass grownfor seedor sodproductionfor 8weeks followingapplication...If application rates total 4.5 pints per acre or less, no waiting period between treatment and feeding or livestockgrazing is required. If the rate is greater than 4.5 pints per acre, remove domestic livestock before application and wait 8 weeksafter application before grazing orharvesting." Herbicide Label:https://s3-us-west-1.amazonaws.com/www.agrian.com/pdfs/Roundup_Custom_Label2.pdf |
Chlorsulfuron (Telar) |
"There are no grazing or hay harvest restrictions for any livestock, including lactating animals, with application rates up to 11/3 ounces/acre of TELAR® XP. No exclosure is required for any animals. Do not apply more than 1 1/3 ounces/acre of TELAR® XP peracreper year. No exclosure is required for anyanimals." Herbicide Label:https://s3-us-west-1.amazonaws.com/www.agrian.com/pdfs/DuPont_Telar_XP_Herbicide_Label5a.pdf |
|
|
Clopyralid(Transline) |
"Grazing/Haying: There are no restrictions on grazing or hay harvest following application of Transline at labeled rates exceptfor exported grass hay from California, Nevada, Washington and Oregon (see instructions in the Range and Permanent GrassPasturesection)...Do not transfer livestock from treated grazing areas, or from feeding of treated hay, to sensitive broadleaf cropareaswithout first allowing 3 days of grazing on an untreated pasture (or feeding of untreated hay). If livestock are transferred withinless than 3 days of grazing untreated pasture or eating untreated hay, urine and manure may contain enough clopyralid to cause injuryto sensitive broadleaf plants...For applications to fallow cropland, rangeland, pasture, and non-crop areas, do not enter treatedareasuntil sprays have dried. For early entry to treated areas, wear eye protection, chemical-resistant gloves made of anywaterproof material, long-sleeved shirt, long pants, shoes andsocks." Herbicide Label:https://s3-us-west-1.amazonaws.com/www.agrian.com/pdfs/Transline1v_Label.pdf |
2, 4-D (DMA4IVM, Weedar 64and manyothers) |
"For grazed areas, the maximum use rate is 4.21 pints of DMA 4 IVM (2 lb of acid equivalent) per acre perapplication...Preharvest Interval: Do not apply within 7 days of cutting forage for hay... If grass is to be cut for hay, Agricultural Use Requirements for the Worker Protection Standard areapplicable." Herbicide Label:https://s3-us-west-1.amazonaws.com/www.agrian.com/pdfs/DMA_4_IVM_Label1d.pdf |
Tables 1 $ 2 from Devii Rao, drorao@ucanr.edu
/table>/table>/table>- Author: Ben Faber
The very fact that avocados can be grown in hard to get to places means that the trees are also in areas that are subject to wildfire damage. Recently several hundred acres of avocado burned in the foothills. The fire was fanned by high winds and low humidity.
Every year there are avocado trees that burn, either through careless attention to early morning fires that pickers build, wildfires or car accidents. A grower needs to be patient and observant to bring the trees back into production.
Although injury to foliage and young growth is visible within a few days of the fire, the full extent of the damage may not be known for several months or possibly the next growing season. In the case of severe injury, die-back may continue to occur for several months after the fire. New growth that occurs after the fire may suddenly collapse the following year when the growth is tested by Santa Ana conditions.
The important rule to follow after a fire is to do nothing - don't prune, don't fertilize and maybe don't water. Or rather, water very carefully. Dry winds may have sucked the water out of the ground and may need to be replenished. The fire may have burned the irrigation lines and need to be replaced.
In the meantime, if the tree has been defoliated by the fire, it has lost its ability to transpire water. Watering a tree with no leaves will set up those conditions that are conducive to root rot. Until the tree begins to leaf out, watch soil moisture to decide how much water the trees are pulling out of the soil. The emitters should be capped or plugged on some leafless trees. Then as the tree puts on new growth, shallow, infrequent irrigations should start. This may mean replacing the 10 gph microsprinkler with a 1 gph dripper if only a portion of the orchard has been burned and the rest of the trees need their usual amounts and frequency of water.
The avocado has a tremendous ability to come back from fire and frost damage. However, the tree will tell you where it is coming back. It will start pushing growth where the tree is still healthy. It may take 3 to 6 months for this growth to occur.
Delay pruning until the tree clearly shows where it is going to regrow. By waiting, you save the expense of having to return sometime later to remove more wood and also will be able to save the maximum about of tree.
An activity the grower can perform is whitewashing. The defoliated tree can be further damaged by sunburn after it has lost its protective cover of leaves. The upper surface of horizontal limbs and the south sides of exposed trunks are the most affected. The whitewash can delay the appearance of new growth, but it does not affect total growth. There is usually no value in applying the whitewash to small limbs.
There are various commercial whitewashes on the market. The easiest to prepare is the cheapest white latex paint on the market mixed with water to the extent that it will go through a sprayer.
Avocado trees have a great ability to recover after fire damage. Even trees killed below the bud union will frequently develop into good trees if they are rebudded and given good care. Trees which do not put out vigorous sprouts should be removed. Interplanting avocados would rarely be advisable because of their rapid recovery.
Fire Information:
http://ceventura.ucanr.edu/Agricultural_Threats/Fire_Information/
- Author: Ben Faber
A great idea from Ed McFadden of Philmore
You can always do something to prevent or correct the Big 4 that seem to strike avocados on a regular basis somewhere in California. Avocados in the back country are right up against areas that can burn easily. A fast fire can send embers into an orchard which can burn through the thick leaves in a slow burn. If it gets up against leaves piled up against the trunk, it can girdle the tree, killing it. The slow burn can continue through the orchard torching the irrigation lines. With a small fire break where the leaves are removed in a small alley, the burn can be slowed or stopped.
Leaves are great for erosion control, for nutrient cycling and disease control, but if they mean increasing potential for fire spread, it's a good idea to remove a little of it. Ed has found that a backpack blower can rapidly remove leaves from around the base of trees and create a narrow fire break that can reduce fire damage to trees.
Avocado orchards are notable for their ability to actually reduce fire hazard and slow major fires as has been shown in fires in San Diego, Ventura and Santa Barbara. This is partly due to running sprinklers during wild fire. But tree loss can still occur, especially when electricity goes down and pumps can't run.
Little rain this year or too much rain this year can always pose a hazard to avocado orchards. This sure seems like a good idea to me. And maybe it's time to start thinking about fire season now.
Photos: Cleared alley and trunk.
- Author: Ben Faber
Avocado is a tree that has a good ability to respond to fire damage, if it is not too extensive. However, often a tree will recover only to collapse later on in the year or years because of the damage. So a tree may appear to do well and then suddenly collapse. In an orchard setting, fire damage can kill one tree completely, whereas the one just beside it recovers completely. This poses a major problem with irrigation management. How to irrigate the slowly regenerating tree that gradually needs more water, less frequently, next to trees that are recovering at a different rate or not at all. This becomes a management nightmare. Often the result of the difficulty of water management, the remaining trees develop root rot and they eventually die from that and not the original fire damage.
There is a general rule of thumb I have learned and used – when more than 50% of the trees have succumbed, it is best to replace the whole orchard. This is due to the issues of irrigation management and the loss of return from the unused portion of the grove.
So, from a pure economic management aspect, where there is any fire damage, that area should be considered a loss. If you look at your aerial survey and just measure the areas that show fire damage and take that as a proportion of the total planted area, you should be able to assess the extent of the damage incurred in the fire. So measuring the brown areas relative to green should give you a good assessment of the damage incurred in the fire.
It may be possible to nurse back individual trees with a lot of attention and if it's a small enough area, go ahead. But on commercial scale of acres, it often doesn't pay from a management point of view to nurse the orchard to an economic production level.
Fire Information:
http://ceventura.ucanr.edu/Agricultural_Threats/Fire_Information/
- Author: Ben Faber
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.
Fire Information:
http://ceventura.ucanr.edu/Agricultural_Threats/Fire_Information/
Photo 1 and 2.