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Hedgerows, pest control, and pollination services on farms
Rachael Long, UC Cooperative Extension Farm Advisor Yolo Co., CA
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Loggerhead shrike Robin Goldfinch
Hedgerow Benefits: ➢ Enhance biodiversity
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Domestic dog
Domestic cat
Mule deer
Virginia opossum
Striped skunk
Raccoon
Black-tailed jackrabbit
Desert cottontail
CA ground squirrel
Mice
0 56 113 169 225
Control Hedgerow
Mammals in Hedgerows vs. Conventional Field Edges (walnuts and tomatoes)
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Hedgerow Benefits ➢Enhance biodiversity ➢Filter traps
Reduce sediments, pesticides, nutrients, and foodborne pathogens.
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Hedgerow Benefits ➢Enhance biodiversity ➢Filter traps ➢Erosion control (water, wind)
Zamora, Yolo Co.
Hedgerow Farms, Winters
Deergrass, Colusa Co.
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Hedgerow Benefits ➢Enhance biodiversity ➢Filter traps ➢Erosion control ➢Weed suppression
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Lygus bug Flea beetle
Cucumber beetle Stink bug
Hedgerow Benefits ➢Enhance biodiversity ➢Filter traps ➢Erosion control ➢Weed suppression ➢Pest suppression
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Hedgerow Benefits ➢Enhance biodiversity ➢Filter traps ➢Erosion control ➢Weed suppression ➢Pest suppression ➢Natural enemies (predators, parasitoids)
Fresno Co.
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Insect natural enemies depend on floral resources (pollen and nectar)
Syrphid fly adult, larva Green lacewing adult, larvaParasitoid wasp adult, larva
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Hedgerows have higher numbers of natural enemies
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Hedgerows export natural enemies into adjacent crops for better pest control
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➢ Fewer insecticides applied for insect control in hedgerow fields.
➢ 4/8 control tomato fields sprayed versus 1/8 hedgerow fields sprayed.
➢ Savings of $260/field/year.
Hedgerow Economics
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Hedgerow Benefits ➢Enhance biodiversity ➢Filter traps ➢Erosion control ➢Weed suppression ➢Pest suppression ➢Natural enemies (predators of pests) ➢Pollinators (native bees, honey bees)
Native bees need food, nesting habitat, and protection from pesticides.
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▪ About 70% of native bees nest underground.
▪ About 30% are cavity nesters (nest in hollow stems or old logs).
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Native bee numbers greater in adjacent crops with hedgerows
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Pollination from enhanced bee visitation, using canola as model crop:
➢ 21% seed increase with native bees (excluding honey bees).
➢ $400 profit every 3-years
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-6000-4000-2000
0200040006000800010000
0 5 10 15 20
Profit!($)
Pest!Control Pest!Control+Pollination
Year!after!restoration
Impacts on a 40 acre field, 1000 ft long hedgerow
Long RF, K Garbach, and L Morandin. 2017. Hedgerow benefits align with food production and sustainability goals. California Agriculture 71(3):117-119.
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Sacramento Valley
England
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Rachael Long Farm Advisor, UC Cooperative Extension
http://ccpestmanagement.ucanr.edu/Hedgerows/
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Long RF, A Corbett, C Lamb, et al. 1998. Movement of beneficial insects from flowering plants to associated crops. California Agriculture. 52(5): 23-26.
Ehler, LE, CG, Pease, RF Long. 2002. Farmscape ecology of a native stink bug in the Sacramento Valley. Fremontia. 30(3-4):59-61.
Long RF and J Anderson. 2010. Establishing hedgerows on farms in California. UC ANR publication number 8390, http://ucanr.org/pubs.cfm.
Morandin L, RF Long, CG Pease, et al. 2011. Hedgerows enhance beneficial insects on farms in California’s Central Valley. California Agriculture. Vol. 65(4):197-201.
Morandin LA, RF Long, C Kremen. 2014. Hedgerows enhance beneficial insects on adjacent tomato fields in an intensive agricultural landscape. J. Ag, Ecosystems, & Environ. Vol. 189:164-170.
Morandin LA, RF Long, and C Kremen. 2016. Pest control and pollination cost benefit analysis of hedgerow restoration in a simplified agricultural landscape. J. Economic Entomology, 109(3):1020-7.
Garbach K and R Long. 2017. Determinants of field edge habitat restoration on farms in California’s Sacramento Valley. J. of Environmental Management, Vol 189:134-141.
Long RF, K Garbach, and L Morandin. 2017. Hedgerow benefits align with food production and sustainability goals. California Agriculture 71(3):117-119.
Sellers LA, RF Long, MT Jay-Russell, et al. 2018. Impact of field-edge habitat on mammalian wildlife abundance, distribution, and vectored foodborne pathogens in adjacent crops. Crop Protection. In Revision.
Peer-reviewed Publications on Hedgerows, 1998-2018 http://ccpestmanagement.ucanr.edu/Hedgerows/
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Sellers LA, RF Long, MT Jay-Russell, et al. In Press. Impact of field-edge habitat on mammalian wildlife abundance, distribution, and vectored foodborne pathogens in adjacent crops. Crop Protection.
“This paper is particularly poignant right now when the Food Safety Modernization Act (FSMA) is calling for farmers to implement co-management of wildlife and agriculture, instead of clear cutting wild habitat around their crops.
The paper provides support for this ruling, showing that the presence of hedgerows does increase wildlife diversity, but does not increase wildlife intrusion into the fields and more importantly, does not increase the prevalence of animals carrying foodborne pathogens.”
Anonymous reviewer