avocado botany and commercial cultivars 2018 · 2015 calif. mexico chile dom. rep. new zealand peru...
TRANSCRIPT
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Chapter2- AvocadoBotanyandCommercialCultivarsGrownin
California
GaryS.BenderSubtropicalHorticulture
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WheredoAvocadosComeFrom?
• SouthernMexicoandCentralAmericaistheareaoforiginforavocado;wildavocadoscanstillbefoundinrainforests.
• Mexicoistheleadingproducerofavocadobyfar,followedbyChileandIndonesia.USAwasfourthinproduction(2009),seventhinproduction(2014)– Thischangesfromyeartoyear
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Production(2014)MeticTons
• Mexico 1,520,695• DomRep 428,301• Peru 349,317• Indonesia 307,326• Columbia 288,739• Kenya 218,692• USA 179,124
• Rwanda 161,519• Chile 160,000• Brazil 156,699
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WorldwideIncreaseinAvocadoProduction
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HassAvocadosCaliforniaandImports
millionsofpounds2014Calif. Mexico Chile Dom.Rep. NewZealand Peru282 1,331 89 2.7 6.6 144
2015Calif. Mexico Chile Dom.Rep. NewZealand Peru262 1,773 21 19 0.27 106
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• InCalifornia,formanyyears,SanDiegoCountygrewalmosthalfofalltheavocadosproducedintheUS,howeverthisisdecliningduetohighwaterprices.
• TherestoftheproductionisfromVentura,SantaBarbara,RiversideandSanLuisObispocounties.
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San Diego County now has 35% of the acreage
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Cultivar Bearing Acreage
Estimated yield (lbs/A) in 2001-2002
Estimated yield in California (million lbs)
in 2001-2002
Hass 51, 575 7,044 363.3Fuerte 1,452 4,125 6.0Bacon 1,961 6,645 13.0Zutano 706 3,144 2.2Pinkerton 1,035 4,715 4.9Reed 430 7,163 3.1Gwen 260 5,633 1.5Lamb Hass 420 5,143 2.2Other 388 3,058 1.2
Total 58,227 6,825 397.4
VarietalProduction2001-2002
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Cultivar Acreage(includes 7,800
acres of topped/stumped
groves)
Yield in lbs/A in 2011-2012
Yield in California
(million lbs) in 2011-2012
Hass 56,548 7,924 448.1
Lamb Hass 1,964 5,295 10.4
Other 1,117 3,312 3.7
Total 59,629 7,753 462.3
VarietalProduction2011-2012
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WorldAvocadoProduction
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5/29/16– 5/14/2017
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Botany• AvocadobelongstotheLauraceaefamily• Inthisfamily,onlytwosignificantgeneraforagriculture• Genus:Persea(50othergenerainLauraceae,mostlytropical
orsubtropical)(afewtemperategeneraincludingSassafrasfromeasternU.S.)
• Genus:Cinnamomumincludescinnamonandcamphorspecies
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• Family:Lauraceae– Genus:Persea
• Subspecies:Persea– IncludesPersea americana (commercialavocado}– AndP.shiedeana (parentofaresistantrootstockG755)
• Subspecies:Eriodaphne– Agroupofspeciesresistanttoavocadorootrot,butnotgraftcompatiblewithcommercialavocadocultivars
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AvocadoRaces(botanicalvarieties)
• Perseaamericanaisthegenusandspeciesofthecommercialavocado
• OtherssuchasPerseaborboniaareimmunetorootrotfungus,buttheyarenotgraftcompatiblewithcommercialvarieties
1. Mexicanrace(thinskinned)2. Guatemalanrace (thickskinned)3. WestIndianrace(verytropical)
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CharacteristicsofBotanicalRaces
• Mexican:earlierharvest,anisesmelltoleaves,thinskin,morecoldtolerant,seedsizeislarge,norootrottolerance,verysensitivetosalinity
• Guatemalan:laterharvest,noanisesmelltoleaves,thickskin,intermediatecoldtolerance,seedsizesmall,norootrottolerance,salttoleranceintermediate
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CharacteristicsofBotanicalRaces
WestIndian:earliestharvest,noanisesmelltoleaves, mediumskinthickness, leastcoldtolerant,seedsizevariable,poorrootrottolerance,mostsalttolerance, fruittextureis‘watery’
• Moretoleranttotropicalconditions.• Shortharvestseasons.Floridahasselectedearly,midandlateseasoncultivarstoextendtheirseason
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TheCaliforniaVarieties
• Hass andFuerte (andmanyothers)areMexican-Guatemalanhybrids– TheMexicangenesimpartearlierharvest– TheGuatemalangenesimpartathickerpeel,allowingsuccessfulshippingoffruit
– AninterestinWestIndianasarootstockbecauseithasbettersalttolerance
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Freezing
• Hass(85%Guatemalan,15%Mexican)fruitwillfreezeifheldat29Fforfourhours
• Fuerte(50-50Guatemalan/Mexican)fruitwillfreezeifheldat26-27Fforfourhours
• Bacon(mostlyMexican)fruitwillfreezeifheldat25Fforfourhours
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Hass
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HarvestSeasonforHass
• Jan-Aug(SanDiego)• AslateasJune-OctinSantaBarbaraandSanLuisObispoCounties
• AlmostyearroundinCalif.(butnotquite)• Oftensizepickedfor7.5to9.0ouncefruit(size48)togetthebestprices
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FuerteandPinkerton
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Reed
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LambHass
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Zutano
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Bacon
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AvocadoCultivars• ProblemswithHass–WhywehaveabreedingprojectColdtenderProductivityisinferiorTreeproductionalternatesGroveproductionvariesfromyeartoyear(1,813lbs.to20,995lbs.inonegroveoverafiveyearperiod)IndustryproductionvariesfromyeartoyearBlackcolornotuniversallyacceptedintheavocado(1950’s)ThetreeistoolargeHassismoresubjecttostresses(drought,salinity,insectdamage)
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Holiday(XX3)• HOLIDAY• Parentage:Guatemalan• Peels: Yes• SeedSize:Medium• SkinTexture: Medium• BlossomType:A• FruitShape:Obovate• SkinColorUnripe: Green• SkinColorRipe: Green• SkinThickness:Medium• AverageFruitWeightoz: 18-24• %RatioSkin/Seed/Flesh: 16:13:71•
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SirPrize• SirPrize• Parentage:Mexicanhybrid
Peels:YesSeedSize: SmallSkinTexture:MediumBlossomType:BFruitShape:ObovateSkinColorUnripe: GreenSkinColorRipe: BlackSkinThickness:ThinAverageFruitWeightoz:10-20%RatioSeed/Skin/Flesh: 9:8:83
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Mexicola• Parentage:Mexican
Peels:NoSeedSize: LargeSkinTexture:SmoothBlossomType:AFruitShape:ObovateSkinColorUnripe: BlackSkinColorRipe: BlackSkinThickness:ThinAverageFruitWeightoz:4to6.5%RatioSeed/Skin/Flesh: 27:12:61
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GEM• Parentage:Guatemalan
Peels:YesSeedSize:MediumSkinTexture:MediumBlossomType:AFruitShape:EllipsoidSkinColorUnripe: GreentoBlackSkinColorRipe: BlackSkinThickness:ThickAverageFruitWeightoz:7to11%RatioSeed/Skin/Flesh: 15:13:72
• FruitoxidizesslowerthanHass
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GEMontheleft,Hassontheright
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CentralValley
• OneoftheresearchgoalsistodevelopavarietythatdoeswellintheCentralValley
• Dr.MaryLuArpaiasaysthatGEM,andtwonewvarieties‘lunchbox’andanun-namedvarietydowellinVisalia
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Harvest• Parentage:Guatemalan
Peels:YesSeedSize: LargeSkinTexture:MediumBlossomType:AFruitShape:HighspheriodSkinColorUnripe: DarkGreenSkinColorRipe: BlackSkinThickness:ThickAverageFruitWeightoz:7to10%RatioSeed/Skin/Flesh: 15:14:71
• MaturelateseasonsameasLambHassorReed
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WestIndianracelarger,thinnerskinnedandmorewaterythanMexican-
Guatemalanhybrids
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“Cukes”(non-fertilized,noseed)fairlycommonintheFuertecultivar
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AvocadoBreedingProgram
“Itisdangeroustohaveanindustrybasedononevariety”- Dr.MaryLuArpaia,UCExtensionHorticulturist
“Hasscanbeimproved”1. Treesizeandstructure2. Bearinghabit3. Alternatebearing4. Stresstolerance5. Diseaseandpest
tolerance6. Productivity7. Seasonality