integrated pest managment
TRANSCRIPT
Planning an Insect Pest Management System from the Ground Up
(with examples from organic research)
Research Institute of Organic Agriculture, FiBL, Switzerland
Geoff Zehnder, Sustainable Agriculture Program, Clemson University
Integrated Pest Management (IPM)
Integrated pest management (IPM) is a pest control strategy that uses a variety of complementary strategies including: biological
and cultural management, mechanical and physical controls, and genetic and pesticides when needed (source: Wikipedia).
Interesting fact: For their leadership in developing and spreading IPM worldwide, Dr. Perry Adkisson (Texas A&M) and Dr. Ray Smith (UC Berkeley) received the 1997 World Food Prize.
Integrated Pest Management
Concept developed in the 1950sEarly proponents emphasized ecological approaches for more permanent solutionsConventional agriculture
Reactive approaches dominatePesticides are relatively cheap (ecological and societal costs not factored)“IPM Continuum” culminates in biologically based strategies
Organic Pest Management:Emphasizes Preventative Practices
1st Phase Strategies(Foundation of Organic Pest Management)
Cultural practices implemented in the initial stages of organic farm planningPrevent and avoid problems beforehandHave roots in traditional agriculture
Strategies Underlying 1st Phase Practices
Strategy Example
Make crop unavailable to pests in space/time
Site selection, crop isolation, timing of planting/harvest, etc
Make crop unacceptable to pests
Intercropping, trap cropping, mulching
Reduce pest survival by enhancing natural enemies
Increase crop ecosystem diversity; farmscaping
Alter crop susceptibility to pests
Host plant resistance/tolerance; soil quality, fertility
Farm Site Selection
Pest management not usually most important consideration, but
Many organic farms are located in regions where climate is unfavorable for pest outbreaks
Example: plum curculioIn general, higher, cooler
and dryer regions support fewer insect pests
Crop Isolation/Rotation
Most effective against pests that disperse short distances and/or that overwinter near host crop fields.
Carrot fly Colorado potatobeetle Onion maggot
Learn about key pest (insect and disease) host range and biology/behavior to help with crop rotation plan
Woody Borders
Modeling studies indicate that woody field borders influence insect pest populations:
Habitat for natural enemiesCan inhibit movement of pests into fields
Isolation of Susceptible CropsIn Space or Time
Insect transmitted virus diseases
Depending on the virus/vector, new crops should be isolated from sources of inoculum (infested fields, weed hosts, etc)
Rotation with Cover Crops
Beneficial, but be aware of secondary effects
Allelopathy; may suppress crop growthExamples; barley, oat, wheat, rye, canola, mustards, fescues,
May harbor secondary pestsi.e. wireworms attracted to grass cover crops
Rotation with Biofumigation Crops
Brassica crops (mustards, rape, etc.)Plant defense compounds
Glucosinolates converted to isothiocyanates
Soil concentrations high enough to kill pathogens, weed seeds, soil insects
Soil Quality ManagementDoes it affect above-ground pest damage?
Organic farming proponents have long held the view that the likelihood of pest outbreaks is reduced in “healthy soil”
Sir Albert Howard. 1940. RC Oelhaf. 1978MC Merrill. 1983
•Belowground and aboveground habitat management is equally important
•Plant resistance is linked to optimal physical, chemical and biological properties of soil
Miguel Altieri (UC Berkeley)
European Corn Borer Infestation Reduced on Plants Grown in Organic Soils
Compared egg-laying on plants grown in soil from organic vs conventional farmsSignificantly more ECB eggs laid on plants in conventional soilEgg-laying was more variable on plants in conventional soils. Variability in egg-laying affected by plant mineral balanceHypothesis: biological buffering in org. soils
Research by Dr. Larry Phelan; Ohio State University
Reduced development of Colorado potato beetle on potato grown in organic soil
Research by Alyokhin & Atlihan, 2005
Mulch: an IPM tool
Can help reduce problems with:
Colorado potato beetleAphid and thrips transmitted viruses
May exacerbate some insect problems
Squash bugPlanthopper
Melon-Virus ExperimentsCover crop as camouflage
Annual rye planted between rows in late fall Virus incidence lower in cover crop treatmentsReflective mulch also reduced virus incidence
0
50
100
2003 2004
CoverNo Cover
% Plants Infected with WMV
Conservation tillage
Favors rich soil biota Greater abundance and diversity of soil microbes in conservation tillageFavors greater numbers of predatory arthropods (spiders, beetles)
Host Plant Resistance
Resistance vs. ToleranceLimited application for control of insect pests in conventional agriculture
Efficacy of synthetic insecticidesLow tolerance for cosmetic damagePartial plant resistance not acceptable
Whitefly Damage: Hairy vs. Smooth Leaf Cotton
Corn Earworm:
Can’t easily penetrate tight husk varieties
`Prince Hairy’ PotatoFrom Cornell Breeding Program
Moderate HPR is preferable in sustainable/organic systems
Low-level pest densities support natural enemy populationsManipulate planting and harvest dates for optimum effectDemand may provide commercial incentives for seed companies to expand screening programs
Second Phase StrategiesVegetation Management
Make habitat less suitable for pests; attractive to natural enemies Terms include:Habitat enhancementFarmscapingEcological Engineering
Conservation biological controlIntercroppingTrap Cropping
Plant Diversification
Provides food and shelter for natural enemies (predators and parasites)
Favorable microclimateAlternative hosts or preySupply of nectar and pollen
Enhances “top-down” action of natural enemies on pests.
Beetle BanksIsland Habitats on Farms
Permanently vegetated raised strips across fields (grasses, perennials). Refuge for
Predatory beetlesSpidersBirdsSmall mammals
Primarily used in large fields (cereal, row crops)Winter home for > 1000 predatory invertebrates per square meter (Thomas et al. 1992)
Conservation Strips
Mixture of forbs and grassesCombines “beetle bank” and “insectary strip” conceptsIncreases rates of predationManagement of weed strips can be used in this context
Int’l. Organic Research Institute in Switzerland
Flowering Insectary Strips
Provides pollen and nectarAttracts and keeps natural enemies in area`Provisioned’ natural enemies have increased longevity, fecundity
Evaluation of Wildflower Strips to Enhance Biocontrol in Cabbage
Pfiffner et al. 2003Treatments
Strips adjacentStrips 10-90 metersCabbage with no strips
Higher rate of parasitism next to stripsParasitism increased with proximity to stripsScale/size of strips relative to crops important
Chocolate-box Ecology?
Flowering plants added without prior testingParasitic wasps visit an ave. of only 2.9 plant speciesResearchers now screen plants for optimal speciesFarmers collect info on key pests, natural enemies to design effective farmscapeswww.attra.org
Intercropping
`Resource concentration’ hypothesis (Root 1973)Concentrated areas of host plants are easier for insect pests to find and colonizeInterferes with pests in a `bottom-up’ manner
Trap Cropping
Attractiveness and relative size in the landscape are key factors
Examples:Blue Hubbard around summer squash; Pumpkins around melons (cuc. beetle)Cherry peppers around bell pepper (pepper maggot) Collards around cabbage (DBM)
Top; Sam Pair, USDA-ARS, Lane, OK
Bottom: Randy Blackmer, Dale, CT
Third Phase StrategiesRelease of Biological Control Agents
Predators, parasitoidsMicrobial agentsSelectivityAllow for rapid response to pest problemsMost research in greenhouse systems
Biocontrol Agent Success in Commercial Greenhouses
Predatory Mites & Orius spp.
Release of Biocontrol Agents in Field-Grown Organic Crops
Experimental Successes
Parasitoidscaterpillars in vegetables, aphids in wheat, leafhopper in vineyards
Mite, ladybug and lacewing predatorsspider mites, aphids and leafhoppers in vineyards and apple orchards
Release of Biocontrol Agents in Field-Grown Organic Crops
Experimental Failures
Cherry fruit fly on sweet cherry
Grape mealybugon grape
Incompatible life histories of pest and biocontrol agent, or disruptionof agents by other natural enemies
Biocontrol LandmarkBacillus thuringiensis
1901; Silkworm “sudden collapse” disease1911: Named by Ernst Berliner (Thuringia)Farmer use in 1920s France; SporineEPA registration in 1961Thousands of strains active against caterpillars, beetles, fliesToxin attacks gut cells Bt spore crystals; Courtesy of Rosemary
Walsh, EMF-LSC, Penn State
Biocontrol LandmarkCodling Moth Granulosis Virus
Isolated from codling moth in 1963Europe
1979: Apple Biological Control ProgramThree commercial formulations; widely used
U.S. Two commercial formulations; little use
Of Less ImportanceEntomopathogenic Fungi and Nematodes
Why is Use of Biological Control Agents Limited?
Commercial development restricted only to those with potential market for large acreage crops
Many effective agents for less important pests never pass beyond developmental stage
Mass rearing techniquesSmall companies; limited technologySuboptimal quality in past but improving
But used regularly in organic farmingResearch needed on how to integrate use of biocontrol agents with other strategies
4th Phase Strategies
Insecticides of biological, mineral originPheromonesRepellentsMineral oils, insecticidal soapsNon-synthetic origin (except pheromones)
Organic Insect Control Products
Current Trends in Organic Farming
Reduced pyrethrin use; non-target effectsAzadirachtin (neem) use is increasing
Successful experiments against several pests including aphids and some chewing insects
Spinosad one of few new approved materialsFermentation product of bacterium Saccharopolyspora spinosa Successfully tested worldwide against a variety of pests/crops
Quassia Extract (bitter wood)Quassia amara
Many active compunds; alkaloids, triterpenes and bitter principles (quassin)50X more bitter than quinine; herbal remedyUsed mostly in Europe:
Mosquito larvacideTo control aphids in cereal cropsTo control wooly apple aphid in tree fruit
Kaolin Clay
Surround WP™Used as a repellent; alters feeding, oviposition behavior of insect pestsMost use in tree fruit, grapes
Specialized Application
Dropleg application of Bacillus thuringiensis var. kurstaki against lepidopterans in leek. The application from top and
bottom increases efficacy of Bt applications. Photo: Eric Wyss, FiBL
Limits of OMRI-Approved Insecticides, etc
Degrade quickly; low potency; short residual activity
Must integrate with other strategiesMore research needed
Develop treatment thresholds for organic systems where natural enemies are prevalent
Commercial developmentEPA; fast-track registrationLimited by markets
Organic Insect Pest Management:Future Directions
Integration of tactics; i.e. 2nd and 3rd phase strategies; Example:
Pest: Brown apple moth
Egg parasite: Longevity and
survival enhanced by nectar plants
Attract & Kill
Products mix pest attractants (pheromones) with insecticide
Attract & Reward
Attract (4th phase)Lures with synthetic plant volatilesAttract beneficial insects
Reward (2nd phase)Pollen, nectar plants
Enhance level of pest control
Valuing Ecosystem Services
“Ecosystem services are the conditions and processes through which natural ecosystems, and the species that make them up, sustain and fulfill human life (Daily 1997).”
The value of global Ecosystem Services estimated at $33 trillion (Costanza et al., 1997).
Dr. H.S. SandhuLincoln University, New Zealand
1. Assessing the predation rate of aphids (Acyrthosiphon pisum Harris)
2. Assessing the predation rates of blow fly eggs (Calliphora vicina R.D.) simulating carrot rust fly eggs (Psila rosae Fab.)
Experimental assessment of ES in arable fields
29 Study Sites (14 Organic and 15 Conventional fields) (a) (b)
Fig. (a) Map of New Zealand study area (Canterbury). (b) Location of selected arable organic ( ) and conventional fields ( )
NAshburton
Rakaia river
Leeston
Lincoln
Predation rates of aphids and fly eggs in
selected arable fields
Fig. Predation rates (%removal/24h) of aphids and fly eggs in selected fields
Ground living polyphagous predators: Are they any value?
Dollar value of biological control of aphids in selected organic fields
More Information
More information on insect management for organic farms can be found at:
•http://attra.org/pest.html
•http://www.extension.org/article/18593
•http://www.sare.org/publications/insect.htm
Acknowledgements
This presentation address general organic production practices. It is to be to use in planning and conducting organic horticulture trainings. The presentation is part of project funded by a Southern SARE PDP titled “Building Organic Agriculture Extension Training Capacity in the Southeast”Project Collaborators•Elena Garcia, University of Arkansas CESHeather Friedrich, University of ArkansasObadiah Njue, University of Arkansas at Pine BluffJeanine Davis, North Carolina State UniversityGeoff Zehnder, Clemson UniversityCharles Mitchell, Auburn UniversityRufina Ward, Alabama A&M UniversityKen Ward, Alabama A&M UniversityKaren Wynne, Alabama Sustainable Agriculture Network