Strawberry cultivation in California
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Strawberries (Fragaria × ananassa) in the United States are almost entirely grown in California – 86% of fresh and 98% of frozen in 2017[1] – with Florida a distant second.[2][3] Of that 30.0% was from Monterey, 28.6% from Ventura, 20.0% from Santa Barbara, 10.0% from San Luis Obispo, and 9.2% from Santa Cruz.[1] The Watsonville/Salinas strawberry zone in Santa Cruz/Monterey, and the Oxnard zone in Ventura, contribute heavily to those concentrations.
Production has risen steadily from 2005 when 34,300 acres (13,900 ha) were harvested through 2017 when 38,200 acres (15,500 ha) were harvested. The 2005 season's harvest sold for $1,122,834,000.[1] The 2017 harvest sold for $3,100,215,000.[1]
The California Strawberry Commission is the Agriculture Department body which advocates for strawberry growers. The CSC provides information for both growers[4] and consumers.[2] Some towns have annual strawberry festivals, see Strawberry festival § United States. The Driscoll's company began with strawberries here and still grows and sells here; they have since expanded to other states, countries, and types of berries.
Cal Poly runs the Strawberry Center[5] for both research, and producer education.
Economics and labor
[edit]Productivity routinely averages 76,500 pounds per acre (85.7 t/ha; 38.3 short ton/acre).[1] In 2017 that resulted in a total of 1,461.2 thousand short tons (1,325.6 thousand metric tons) worth $3,100,215,000.[1]
In 2017, growers received $1.23 per pound ($2.7/kg), which was 1.126x the average value/weight for fruits, and compared to $1.40 per pound ($3.1/kg) for Florida growers.[6] 269.6 million pounds (122,300 metric tons; 134,800 short tons) were harvested, facing Mexican imports of 364.6 million pounds (165,400 metric tons; 182,300 short tons).[6] Growers paid $12.60/hour on average to farmworkers.[6] In 2005 Santa Maria was far below Oxnard and Salinas–Watsonville.[7] By 2019 however Santa Maria had become the highest producing area in the state for both conventional and organic.[7] In 2021 36,500 acres (14,800 ha; 148 km2) were harvested, almost all from the same three longstanding areas, Oxnard, Santa Maria, and Salinas–Watsonville.[7] This requires 1.5 workers per acre (3.7/ha) totalling 50-60,000 in the summer peak.[7]
Pest management
[edit]![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Strawberry_Fields_In_Carlsbad_Ca_%28120852233%29.jpeg/220px-Strawberry_Fields_In_Carlsbad_Ca_%28120852233%29.jpeg)
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Regional Integrated Pest Management Centers (Regional IPM Centers) hosts a suggested IPM plan for strawberry.[1]
For Santa Barbara County specifically, Cooperative Extension SB provides detailed recommendations and practices.[8] For their cultivar recommendations see Agriculture in California § Cultivars.
As of 2022[update] there is increasing interest and increasing progress in automated (robotic) phytopathology in this crop, especially monitoring for insects and UV-C application for mites.[9]
Diseases
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![Raised bed field in Carlsbad, 2010](http://upload.wikimedia.org/wikipedia/commons/thumb/3/37/Strawberry_fields_in_Carlsbad%2C_April_2010.jpg/220px-Strawberry_fields_in_Carlsbad%2C_April_2010.jpg)
![Picking crew, Bell, ~1910](http://upload.wikimedia.org/wikipedia/commons/thumb/6/6d/Group_of_strawberry_pickers_in_a_strawberry_field_in_Bell%2C_California%2C_ca.1910_%28CHS-1130%29.jpg/220px-Group_of_strawberry_pickers_in_a_strawberry_field_in_Bell%2C_California%2C_ca.1910_%28CHS-1130%29.jpg)
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The use of soil fumigation was highly praised and widely recommended by the California Strawberry Advisory Board in 1967.[10] Strawberry production here has been highly productive ever since but also highly dependent on fumigants.[11] So vital was the most common fumigant – methyl bromide – that the ongoing phase out of the chemical has sent growers and researchers scrambling for alternatives.[10] One alternative specifically for nematodes is 1,3-Dichloropropene, however some of the finely textured soils in some of the state's soil regions reduce its efficacy, and as of 2010[update] there are restrictions in some townships on maximum rates.[10] Soil solarization is another option.[12] Stapleton et al., 2005 eliminate almost 100% of annual weeds in this crop with solarization alone.[12] It completely fails against yellow nutsedge however.[12]
Various strains of Botrytis cinerea are the most common and most impactful disease of this crop.[1][13] Botrytis leaf spot was first discovered here.[14] Conventional strawberry requires many fungicide sprays per season.[13] Losses can commonly be 30–40% if fungicides are not competently employed, or not permitted as with organic.[1] If lower temperatures and high rain persist unusually long, such a control failure will cost 50–60% of the yield – at this point the season is abandoned and 100% of revenue will be lost.[1]
Strawberry crown rot is a major disease here as it is in any productive growing region.[15] Genetic markers for CR resistance would make a significant difference in yield.[15] Shaw et al., 2008 is a starting point for such screening, using the markers they found.[15] See Agriculture in California § Strawberry crown rot and Agriculture in California § Phytophthora cactorum.
Daugovish et al., 2012 finds the introduction of drip irrigation has reduced asymptomatic Colletotrichum acutatum presence in nurseries, and thus lower anthracnose in the resulting transplants.[16] See Agriculture in California § Strawberry anthracnose and for a treatment see Agriculture in California § Natamycin.[17]
The only effective treatment of Fusarium Wilt may be genetic resistance.[18] Pincot et al., 2018 tested UCD varieties for resistance and located Fw1, a dominant gene explaining almost all FW resistance.[18] Fw1 is very likely to be a toll/interleukin-1 receptor (TIR) nucleotide-binding leucine-rich repeat (NB-LRR) gene.[18] They also identify seven accessions which are fw1 (recessive susceptible homozygous) yet nonetheless resistant, and thus predicted to carry yet-unidentified novel genetics.[18] See Agriculture in California § Fusarium Wilt of Strawberry.
No cultivar has full resistance to Powdery Mildew, and the partial resistance that is available varies widely.[1] Palmer & Holmes 2021 finds increasing resistance/declining efficacy to most of the most commonly applied ingredients, in Oxnard.[19]
Pests
[edit]Insects are a constant concern.[20][21] The Beet Armyworm (BAW, Spodoptera frugiperda) skeletonizes leaves, damages crowns, and then begins eating the berries.[21] BAW is especially a problem of the southern and Santa Maria strawberry zones, but can damage transplant crowns anywhere in the state.[21] Egg deposition is most often in the fall.[21] Overwintering is possible and will produce earlier and more severe infestations.[21] BAW is controlled by a parasitoid wasp, Hyposoter exiguae, and by Spodoptera exigua nuclear polyhedrosis virus (SeNPV)[22] but additional control may be needed.[21] Insecticides during transplanting are needed sometimes in the southern areas, but sometimes not due to natural controls.[21] A good part of control relies only on weed management in the surrounding area, depriving BAW of alternate hosts.[21] Further control may be needed using insecticides including methoxyfenozide, spinetoram, Bacillus thuringiensis ssp. kurstaki, diazinon.[21] Organic control requires all of the non-insecticide methods (aggressive weeding, wasps, virus) plus Bacillus thuringiensis ssp. aizawai or Entrust which contains spinosad.[21]
The Western Flower Thrips is common here.[23] Organochlorines were used until being replaced in the 1970s by carbamates and organophosphates.[23] See Agriculture in California § Western Flower Thrips.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Lygus5.jpg/220px-Lygus5.jpg)
Lygus bugs are common pests here including the Western Tarnished Plant Bug (Lygus hesperus).[24] A vacuum collector called the BugVac is often used for this pest in strawberry.[25]
Birds have mixed effects on strawberries here.[26] They both eat farmed fruits but also the insects that trouble them.[26] Hedgerows attract birds, whether that is desirable or undesirable.[26] In the Central Valley, farm hedgerows, treelines, and woodlands will have 2x–3x the number of species and 3x–6x the population size of birds than an unvegetated edge of a field.[26]
Whatever the specific effect of birds upon strawberry fields, large hedgerows in this state do improve both the yield and quality of strawberries grown nearby versus those grown next to smaller hedges or grassy banks.[26]
Weeds
[edit]Yellow sweetclover (Melilotus officinalis L. Lam.), chickweed (Stellaria spp.), annual bluegrass (Poa annua Linnaeus), shepherd's purse (Capsella bursa-pastoris Linnaeus Medikus), crabgrass (various Digitaria spp.), spotted spurge (Euphorbia maculata Linnaeus Small), and yellow nutsedge are common annual weeds in strawberry.[12]
Treatments
[edit]![White plastic rows](http://upload.wikimedia.org/wikipedia/commons/thumb/9/90/Strawberry_field_with_plastic.jpg/220px-Strawberry_field_with_plastic.jpg)
UC IPM recommends[27] pesticide selection criteria, resistance management strategies, application practices, and environmental considerations.
Fungicides are used many times per season.[13] Captan is by far the most common, averaging 7.3 applications per season, pyraclostrobin 2.5, cyprodinil 2.3, fludioxonil 2.3, boscalid 1.8, fenhexamid 1.4, pyrimethanil 1.2, penthiopyrad 0.9, sodium tetraborohydrate decahydrate 0.8, fluxapyroxad 0.75, and there were rare uses of Polyoxin D, Neem Oil, Fluopyram, Banda de Lupinus albus doce, Trifloxystrobin, Bacillus subtilis, Reynoutria sachalinensis, Thiram, Streptomyces lydicus, Bacillus amyloliquefaciens, Thiophanate-methyl, Aureobasidium pullulans, Hydrogen dioxide, and Peroxyacetic acid.[13] UCR recommends fungicides and resistance management guidelines.[28] (See Agriculture in California § Captan, Agriculture in California § Pyraclostrobin, Agriculture in California § Cyprodinil, Agriculture in California § Fludioxonil, Agriculture in California § Boscalid, Agriculture in California § fenhexamid, and Agriculture in California § Pyrimethanil.)
The interests of nurseries and growers in maintaining fungicide efficacy necessitates coordination of their fungicide usage between them to slow resistance evolution.[1]
So beneficial was fumigation in this crop that Ansel Adams and Nancy Newhall selected it as one of the great achievements of the University of California system to photograph for their centennial book.[29][30] However, increasing legal restrictions have made alternatives financially more attractive, otherwise more attractive, or even just necessary.[12][29] Methyl bromide, and then methyl bromide + chloropicrin, were the original fumigants which so impressed Adams & Newhall and this allowed great expansion of strawberries here.[29] Over the next several decades this encouraged breeding to ignore disease resistance in preference to all other traits, and only recently has methyl bromide phaseout made resistance interesting again.[29]
Anaerobic soil disinfestation doesn't work for weeds in this crop, but ASD combined with rice bran is a good alternative to methyl bromide and other soil fumigants for microbial diseases including Verticillium dahliae.[31][18]
Breeding
[edit]![](http://upload.wikimedia.org/wikipedia/commons/thumb/3/39/Beach_Strawberry_%28Fragaria_chiloensis%29.jpg/220px-Beach_Strawberry_%28Fragaria_chiloensis%29.jpg)
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![Beach Strawberry, coastal cliffs, Iversen, Mendocino](http://upload.wikimedia.org/wikipedia/commons/thumb/5/59/Fragaria_chiloensis_kz05.jpg/220px-Fragaria_chiloensis_kz05.jpg)
The Davis campus is a major hub of strawberry breeding in the state, and indeed in the world.[32] The Knapp group[33] is a large part of strawberry biology study at the university, including the breeding program – of which Knapp himself is the director.[33] UCD's varieties may be licensed from ITC.[34] From 1986 Douglas Shaw headed the program, and starting in 1991 Kirk Larson co-headed with him.[35] In 2013 they attempted to negotiate a retirement arrangement in which they would start their own breeding company, licensing UCD's patented varieties.[35] UCD initially agreed but, anticipating the loss of revenue from what would essentially be a spin-off, reversed themselves.[35] Shaw and Larson retired anyway in 2014 as California Berry Cultivars, licensed what they could and began to breed from those, and sued UCD for not holding to the previous agreement.[35] UCD countersued, alleging they had walked away with (stolen) unreleased germplasm and various other intellectual property violations.[35] A civil trial resulted and, although CBC rapidly lost ground, the judge suggested that UCD would also be examined and face some consequences if the trial were to proceed.[35] UCD and CBC settled with CBC forgoing $2.5 million in future royalties.[35]
Other strawberry species (Fragaria spp.) are commonly used in breeding, including F. vesca the Woodland Strawberry.[36] The UCD program is no exception and its genetic analyses also are used around the world by geneticists, other researchers, and breeders.[36]
The analysis of Pincot et al., 2018 incidentally identifies a likely bottleneck in UCD's germplasm beginning in 1975.[18]
CalPoly Strawberry Center[5] does not operate a breeding program of its own. Instead the SC screens the varieties that come out of all of the state's breeding programs for disease resistance.[37]
Driscoll's has its own private breeding program.[38]
Day-neutrality is necessary to cultivation in some of the state's growing zones.[39] F. virginiana ssp. glauca's day-neutrality was introgressed into F. xananassa and first released in 1979 varieties.[39]
Cultivars
[edit]UC IPM lists and describes the most commonly grown varieties of strawberry here.[40]
UC Davis's Innovation and Technology Commercialization office licenses and sub-licenses[41] all cultivars created by the entire University system.[42] These are:
For Santa Barbara County specifically, Cooperative Extension SB recommends overlapping with two cultivar groups: Short-day and day-neutral.[8] For short day they suggest cvs. 'Benicia', 'Camarosa', 'Camino Real', 'Chandler', 'Mojave', and/or 'Ventana'.[8] For day-neutral, cvs. 'Albion', 'Monterrey', 'San Andrés', and/or 'Seascape'.[8]
As of July 2022[update] twelve nurseries are licensed to propagate UCD varieties: Cal, Cedar Point, Crown, Innovative Organic, Jacobsen Pacific, Larse, Lassen Canyon, Monte Vista, Mountain Valley, NorCal, Planasa, and Sierra-Cascade.[43]
cv. 'Camino Real' produces heavily in the Central Coast.[8] 'CR' yields over 4,000 pounds per acre (4.5 t/ha) more than cv. 'Chandler', and berries average 27 grams vs. 21 grams, in Fresno County.[44]
From the introduction of methyl bromide in late 1950s to the beginning of phaseout in the late 1990s, MB's great effectiveness encouraged breeders to ignore soilborne disease resistance in preference to all other traits.[29] Now, especially with the end of all methyl bromide use outside of nurseries in December 2016, resistance has become interesting again.[29] There is indeed a wide range of resistance to soilborne pathogens in existing cultivars and these resistances can be quite effective.[29]
Varieties bred here tie with Mediterranean varieties for the most inbred in the world, due to intense breeding specifically for this market.[15]
Florida's industry commonly uses varieties originated here.[45] Turkey's modern strawberry industry was begun from California varieties, and still relies heavily on varieties bred here, along with Florida varieties and some from Australia.[46]: 6
Testing
[edit]UCD's Foundation Plant Services performs disease testing (especially for viruses), variety identification testing, and supplies tissue or plants for propagation material.[47][48]
References
[edit]- ^ a b c d e f g h i j k l "2021 Pest Management Strategic Plan for Strawberry in California". Regional Integrated Pest Management Centers Database. 2022-05-04. Retrieved 2022-06-29.
- ^ a b "Health Benefits, Recipes & Stories". California Strawberry Commission. 2022-05-23. Retrieved 2022-06-03.
- ^ "Strawberry Production". Penn State Extension. 2005-06-20. Retrieved 2022-06-06.
- ^ "California Strawberry Commission". California Strawberry Commission. Retrieved 2022-06-03.
- ^ a b "Strawberry Center". Cal Poly. 2020-07-28. Retrieved 2022-06-02.
- ^ a b c Li, Zongyu; Gallardo, Karina; McCracken, Vicki; Yue, Chengyan; Whitaker, Vance; McFerson, James (2020). "Grower Willingness to Pay for Fruit Quality versus Plant Disease Resistance and Welfare Implications: The Case of Florida Strawberry". Journal of Agricultural and Resource Economics. 45 (2). Western Agricultural Economics Association: 199–218. doi:10.22004/ag.econ.302450. eISSN 2327-8285. ISSN 1068-5502.
- ^ a b c d "Strawberries: Growth and Labor". Rural Migration News Blog, Migration Dialogue, University of California, Davis. 2022. Retrieved 2022-08-25.
- ^ a b c d e Bolda, Mark; Dara, Surendra K.; Fallon, Julie; Sanchez, Misael; Peterson, Kevin (November 2015). Dara, Surendra K.; Faber, Ben; Bolda, Mark; Fallon, Julie; Sanchez, Misael; Peterson, Kevin; Coates, Anne; Barnum, Lauren (eds.). Strawberry Production Manual For Growers on the Central Coast (2 ed.). Retrieved 2022-06-14.
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ignored (help) - ^ "Field Day 2022 Information and Handouts". Cal Poly Strawberry Center. 2022. Retrieved 2022-08-05.
- ^ a b c Zasada, Inga A.; Halbrendt, John M.; Kokalis-Burelle, Nancy; LaMondia, James; McKenry, Michael V.; Noling, Joe W. (2010). "Managing Nematodes Without Methyl Bromide". Annual Review of Phytopathology. 48. Annual Reviews: 311–328. doi:10.1146/annurev-phyto-073009-114425. PMID 20455696.
- ^
- • Duniway, J. M. (2002). "Status of Chemical Alternatives to Methyl Bromide for Pre-Plant Fumigation of Soil". Phytopathology. 92 (12). American Phytopathological Society: 1337–1343. doi:10.1094/phyto.2002.92.12.1337. ISSN 0031-949X. PMID 18943890. S2CID 8814636.
- • Martin, Frank N. (2003). "Development of Alternative Strategies for Management of Soilborne Pathogens Currently Controlled with Methyl Bromide". Annual Review of Phytopathology. 41 (1). Annual Reviews: 325–350. doi:10.1146/annurev.phyto.41.052002.095514. ISSN 0066-4286. PMID 14527332.
- ^ a b c d e
- • Stapleton, James J; Molinar, Richard H; Lynn-Patterson, Kris; McFeeters, Stuart K; Shrestha, Anil (2005). "Methyl bromide alternatives … Soil solarization provides weed control for limited-resource and organic growers in warmer climates". California Agriculture. 59 (2). UC Agriculture: 84–89. doi:10.3733/ca.v059n02p84. ISSN 0008-0845. S2CID 56211614.
- • D'Addabbo, Trifone; Miccolis, Vito; Basile, Martino; Candido, Vincenzo (2009-11-06). "Soil Solarization and Sustainable Agriculture". Sociology, Organic Farming, Climate Change and Soil Science. Sustainable Agriculture Reviews. Vol. 3. Dordrecht, Ne: Springer Netherlands. pp. 217–274. doi:10.1007/978-90-481-3333-8_9. ISBN 978-90-481-3332-1. ISSN 2210-4410. S2CID 85754446.
- • Hanson, B. D. (2006-04-01). "Weed control with methyl bromide alternatives". CAB Reviews. 1 (63). CABI Publishing: 1–13. doi:10.1079/pavsnnr20061063. ISSN 1749-8848. S2CID 67794073.
- ^ a b c d
- • Cosseboom, Scott D.; Ivors, Kelly L.; Schnabel, Guido; Bryson, Patricia K.; Holmes, Gerald J. (2019). "Within-Season Shift in Fungicide Resistance Profiles of Botrytis cinerea in California Strawberry Fields". Plant Disease. 103 (1). American Phytopathological Society: 59–64. doi:10.1094/pdis-03-18-0406-re. ISSN 0191-2917. PMID 30422743. S2CID 205345358.
- • Petrasch, Stefan; Knapp, Steven J.; van Kan, Jan A. L.; Blanco-Ulate, Barbara (2019-04-04). "Grey mould of strawberry, a devastating disease caused by the ubiquitous necrotrophic fungal pathogen Botrytis cinerea". Molecular Plant Pathology. 20 (6). British Society for Plant Pathology (W-B): 877–892. doi:10.1111/mpp.12794. ISSN 1464-6722. PMC 6637890. PMID 30945788. S2CID 93002697.
- • Sare, Abdoul Razack; Jijakli, M. Haissam; Massart, Sebastien (2021). "Microbial ecology to support integrative efficacy improvement of biocontrol agents for postharvest diseases management". Postharvest Biology and Technology. 179. Elsevier: 111572. doi:10.1016/j.postharvbio.2021.111572. ISSN 0925-5214. S2CID 236245543.
- ^
- • Singh, Prem Pratap; Kumar, Akshay; Gupta, Vishal; Prakash, Bhanu (2021). "1 Recent advancement in plant disease management". Food Security and Plant Disease Management. Woodhead (Elsevier). pp. 1–18. doi:10.1016/b978-0-12-821843-3.00012-x. ISBN 9780128218433. S2CID 234210229.
- • Mansouripour, S.; Holmes, G. J. (2020). "First Report of Botrytis cinerea Causing Leaf Spot on Strawberry in California". Plant Disease. 104 (6). American Phytopathological Society: 1866. doi:10.1094/pdis-06-19-1287-pdn. ISSN 0191-2917. S2CID 213497016.
- ^ a b c d Whitaker, Vance M. (2011). "Applications of molecular markers in strawberry". Journal of Berry Research. 1 (3). IOS Press: 115–127. doi:10.3233/br-2011-013. ISSN 1878-5093. S2CID 34780711.
- ^
- • Swett, Cassandra L. (2020). "Managing Crop Diseases Under Water Scarcity". Annual Review of Phytopathology. 58 (1). Annual Reviews: 387–406. doi:10.1146/annurev-phyto-030320-041421. ISSN 0066-4286. PMID 32580692. S2CID 220059370.
- • Daugovish, Oleg; Bolda, Mark; Kaur, Sukhwinder; Mochizuki, Maren J.; Marcum, Daniel; Epstein, Lynn (2012). "Drip Irrigation in California Strawberry Nurseries to Reduce the Incidence of Colletotrichum acutatum in Fruit Production". HortScience. 47 (3). American Society for Horticultural Science: 368–373. doi:10.21273/hortsci.47.3.368. ISSN 0018-5345. S2CID 85901362.
- ^ Dowling, Madeline; Peres, Natalia; Villani, Sara; Schnabel, Guido (2020). "Managing Colletotrichum on Fruit Crops: A "Complex" Challenge". Plant Disease. 104 (9). American Phytopathological Society: 2301–2316. doi:10.1094/pdis-11-19-2378-fe. ISSN 0191-2917. PMID 32689886. S2CID 219479598.
- ^ a b c d e f
- • Pincot, Dominique D. A.; Poorten, Thomas J.; Hardigan, Michael A.; Harshman, Julia M.; Acharya, Charlotte B.; Cole, Glenn S.; Gordon, Thomas R.; Stueven, Michelle; Edger, Patrick P.; Knapp, Steven J. (2018). "Genome-Wide Association Mapping Uncovers Fw1, a Dominant Gene Conferring Resistance to Fusarium Wilt in Strawberry". G3: Genes, Genomes, Genetics. 8 (5). Oxford University Press (Genetics Society of America): 1817–1828. doi:10.1534/g3.118.200129. ISSN 2160-1836. PMC 5940171. PMID 29602808. S2CID 4493211.
- • Whitaker, Vance M.; Knapp, Steven J.; Hardigan, Michael A.; Edger, Patrick P.; Slovin, Janet P.; Bassil, Nahla V.; Hytönen, Timo; Mackenzie, Kathryn K.; Lee, Seonghee; Jung, Sook; Main, Dorrie; Barbey, Christopher R.; Verma, Sujeet (2020). "A roadmap for research in octoploid strawberry". Horticulture Research. 7 (1). Nature (Nanjing Agricultural University): 33. Bibcode:2020HorR....7...33W. doi:10.1038/s41438-020-0252-1. ISSN 2662-6810. PMC 7072068. PMID 32194969. S2CID 212706734.
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