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1. 800-346-9140
GREENHOUSE IPM: SUSTAINABLE
APHID CONTROL
Appr i e Technol Tr
opr at ogy ansf f Rur Ar
er or al eas
PEST MANAGEMENT TECHNICAL NOTE
www.attra.ncat.org
ATTRA is the national sustainable agriculture information center funded by the USDA’s Rural Business -- Cooperative Service.
Abstract: This publication summarizes IPM for greenhouse aphids on both vegetable and
ornamental crops. Focus is on monitoring, sanitation, biological controls, biorational pesticides, and
insect growth regulators. Supplemental tables include information on the newest biopesticides and
biological control organisms.
By Lane Greer
NCAT Agriculture Specialist
June 2000
The following document focuses on least-toxic
methods for dealing with aphids in greenhouses.
For general information on greenhouse IPM,
request ATTRA’s publication Integrated Pest
Management for Greenhouse Crops, which covers
topics such as screening to eliminate pests, weed
management, and disease control.
Introduction
There are approximately 4,000 aphid species in
the world. Life cycles and preferred hosts vary
with each type of aphid. Common aphid pests of
greenhouse crops include the green peach aphid
Courtesy Of Hercules Inc., Wilmington, Delaware
(Myzus persicae), the melon/cotton aphid (Aphis
gossypii), the chrysanthemum aphid
(Macrosiphum rosae), the potato aphid
(Macrosiphoniella sanborni), the rose aphid
(Macrosiphum euphorbiae) and the foxglove aphid
(Aulacorthum solani) (1).
Contents
The green peach aphid is probably the most
Introduction.......................................................1 notorious aphid pest of greenhouse crops because
Crop Scouting and Trapping.........................2 of its wide host range, worldwide distribution,
Biological Control ............................................2 number of viral diseases it vectors, and difficulty
Biorational Pesticides......................................2 of control (2).
Insect Growth Regulators ..............................3
Summary and Further Resources .................4 Aphid management relies on understanding that
References..........................................................5 the females of many aphid species do not have to
Biological Control Suppliers.........................5 mate in order to reproduce, and they typically
Appendix 1: Beneficial Organisms .............8 produce live young, rather than eggs. These
Appendix 2: Biorational Pesticides.............11 characteristics contribute to the tendency of
aphid populations to "explode."
IS A PROJECT OF THE NATIONAL CENTER FOR APPROPRIATE TECHNOLOGY
2. Crop Scouting and Trapping Biological Control
Plants should be visually inspected for signs of There are several biological control options for
an aphid infestation. Look especially carefully at greenhouse aphid pests. Some common
plants prone to aphid problems, and at plant biological control agents (BCAs) include green
parts like the undersides of leaves, stems, and lacewings (Chrysoperla carnea, C. rufilabris,
new growth. Choose plants randomly Chrysopa spp.), aphid midges (Aphidoletes
throughout the greenhouse and inspect aphidimyza), parasitic wasps (Aphidius colemani
undersides of leaves, buds or tip growth and and Aphidius matricariae) and lady beetles
watch for honeydew and cast skins. Since aphids (Hippodamia convergens). See Appendix I:
are difficult to see on plants with fine foliage, Beneficial Organisms for more BCAs and
hold such plants over a white piece of paper and suppliers.
gently tap to dislodge any aphids. Avoid moving
infested plants to new areas where susceptible A 1998 study showed that green lacewing larvae
plants are growing. Locations where aphids are did not disperse as well as the parasitic wasp
found should be flagged, so that population Aphidius colemani (3). To achieve equal aphid
development and control efforts can be suppression, more of the slower-moving species
evaluated. need to be introduced and from more points
(lacewings have to be released on each bench
Different aphid species tend to populate different because they cannot move to adjacent benches,
parts of their host plants. Green peach aphids for instance). A study performed at Colorado
tend to cluster on the succulent young growth, State University compared the effectiveness of
whereas melon aphids are usually evenly parasitic wasps, aphid midges, lady beetle larvae,
distributed along the plant stems. Melon aphid and green lacewing larvae (4). The researchers
populations also have fewer winged adults than found that lacewings performed better in hot
do green peach aphids. Knowing which species temperatures, while aphid midges and lady
is infesting the crop is very important in beetles were better in cooler temperatures. At all
successful detection and monitoring of aphid temperatures, Aphidoletes was the best of the four
populations. The Cooperative Extension Service at controlling aphids.
is a good resource for identification of specific
aphid pests.
Biorational Pesticides
Yellow sticky cards placed horizontally at the top
of the pot or container (if you are growing Strains of the fungus Beauveria bassiana provide
containerized plants) can be used for monitoring good control of aphids, including green peach
winged aphids. However, since winged aphids aphids. The fungus works by attaching to the
caught during the summer months may have outside of the pest, then penetrating into the
blown in from the outdoors, sticky cards are not body and killing it. The fungus is available
as reliable as visual inspections. Sticky cards are commercially for greenhouse ornamentals as
more useful in the winter months when aphids Naturalis-O™ and for vegetables as
caught on the cards are not likely to have come in BotaniGard™. (See below for suppliers.)
from the outside. It is better to rely primarily on
visual inspections for aphid detection, and use Another fungus, Verticillium lecanii, can also
sticky cards as a backup method. provide good biological control of aphids.
Formulations of this fungus are currently being
Signs of an aphid infestation include honeydew sold in some European countries under the
or sooty mold on leaves, yellow spots on upper names of Vertalec™ and Mycotal™, but neither
leaf surfaces, cast skins on leaves, curling of of these products is yet registered for use in the
leaves, and distortion of new growth. United States.
// GREENHOUSE IPM: SUSTAINABLE APHID CONTROL Page 2
3. Verticillium lecanii often occurs naturally in target species, such as humans, birds, fish or
greenhouses, so it may be possible to encourage other vertebrates. For most IGRs there are
its growth and distribution in the greenhouse minimal re-entry restrictions. IGRs typically take
without the benefit of a commercially available several days to have an effect on pest
product. V. lecanii spores require at least 93% populations. Because IGRs do not affect mature
relative humidity at temperatures between 59 insects, adult beneficials released into the
and 81°F to germinate and grow (6). High greenhouse after an IGR application are not likely
humidity must be present for at least 10–12 to be affected. Use of IGRs is generally
hours/day. Unfortunately, most plant disease- prohibited by organic certification organizations
causing fungi also grow best at these same because the products are synthesized.
temperature and humidity ranges. Fungicides
used to control the plant disease-causing fungi IGRs can sometimes be used in conjunction with
would probably also kill any beneficial fungi biological control efforts and may provide
present. Insecticides may also be harmful to V. growers with a “safety net” should beneficials
lecanii. fail to keep the pests below economically
damaging levels. The table below lists some
Least-toxic pesticides used against aphids in well-known insect growth regulators. (Contact
greenhouses include insecticidal soap (M- information for suppliers is listed at the end of
Pede™), horticultural oil (UltraFine SunSpray this document.)
spray oil™), and botanical insecticides such as
neem (Azatin™, Neemazad™, and Neemix™), or
natural pyrethrums. See Appendix II:
Biorational Pesticides for more information and
suppliers.
Insect Growth Regulators
Insect growth regulators (IGRs) are another least-
toxic pesticide control option for pests. IGRs
typically kill insects by disrupting their
development. They have a complex mode of
action that precludes insects from rapidly
developing resistance. IGRs can work in one of
several ways: 1) they can mimic juvenile
hormones, so that insects never enter the
reproductive stage of development; 2) they can
interfere with the production of chitin, which
makes up the shell of most insects; or 3) they can
interfere with the molting process. IGRs usually
work through ingestion, so good spray coverage
is essential. They generally don’t affect non- Courtesy of Hercules Inc. Wilmington, Delaware
// GREENHOUSE IPM: SUSTAINABLE APHID CONTROL Page 3
4. Table 1. Selected Insect Growth Regulators
Brand Name Supplier Active against:
Azatin Hydro-Gardens, Olympic whiteflies, leafminers, thrips,
Horticultural Products mealybugs, fungus gnats, aphids,
cabbage loopers, diamondback
moths, armyworms
Enstar II Wellmark Intl. whiteflies, fungus gnats, aphids,
soft and armored scales, mealybugs
Neemazad Thermo Trilogy whiteflies, leafminers, thrips,
mealybugs, fungus gnats, aphids,
cabbage loopers, diamondback
moths, armyworms
Neemix Thermo Trilogy whiteflies, leafminers, thrips,
mealybugs, fungus gnats, aphids,
loopers, diamondback moths,
armyworms, cabbage loopers
Preclude Whitmire Micro-Gen whiteflies, thrips, scales, aphids
Summary and Further Resources
Greenhouse aphids are tiny insects, but they control measures that dovetail very nicely with
demand serious attention on the part of the the IPM philosophy. In the resources sections
greenhouse grower. Integrated pest management below, growers are provided with a list of
offers a sustainable approach for dealing with biological control suppliers; and tables that
greenhouse aphids, and safer pest control summarize biocontrol agents and biorational
products facilitate the adaptation of least-toxic pesticides that control aphids.
Related ATTRA Materials
• Organic Greenhouse Vegetable Production
• Integrated Pest Management of Greenhouse Crops
• Greenhouse IPM: Sustainable Thrips Control
• Greenhouse IPM: Sustainable Whitefly Control
// GREENHOUSE IPM: SUSTAINABLE APHID CONTROL Page 4
5. References: Caltec Agri-Marketing Services
PO Box 576155
1) Lindquist, Richard. 1991. A guide to aphid Modesto, CA 95357
control. GrowerTalks. October. p. 75. 209-575-1295
209-575-0366 fax
2) Sunderland, Keith et al. 1992. Integrated pest http://www.caltecag.com
management of greenhouse crops in Northern
Europe: Aphids. p. 23–30. In: Jules Janick Florikan ESA Corp.
(ed.) Horticultural Reviews: Vol. 13. John 1523 Edger Place
Wiley and Sons, Inc. New York, NY. Sarasota, FL 34240
800-322-8666
3) Heinz, K.M. 1998. Dispersal and dispersion 941-377-3633 fax
of aphids and selected natural enemies in Email: buglady@aol.com
spatially subdivided greenhouse
environments. Environmental Entomology. The Green Spot, Ltd.
Vol. 27, No. 4. p. 1029–1038. 93 Priest Rd.
Nottingham, NH 03290-6204
4) Anon. 1999. Efficacy of four biocontrol agents 603-942-8925
on the green peach aphid, Myzus persicae, in 603-942-8932
greenhouse peppers. Midwest Biological 603-942-5027 voice mail
Control News. January–February. p. 7. Email: GrnSpt@internetMCI.com
Harmony Farm Supply
Biological Control Suppliers 3244 Hwy. 116 No. F
Sebastopol, CA 95472
A-1 Unique Insect Control 707-823-9125
5504 Sperry Dr. 707-823-1734 fax
Citrus Heights, CA 95621 Email: kate@harmonyfarm.com
916-961-7945 http://www.harmonyfarm.com
916-967-7082 fax
Email: ladybugs@a-1unique.com Hot Pepper Wax, Inc.
http://www.a-1unique.com 305 Third St.
Greenville, PA 16125
ARBICO Inc. 888-667-3785
PO Box 4247 CRB 724-646-2302 fax
Tucson, AZ 85738 Email: lindag@hotpepperwax.com
800-SOS-BUGS http://www.hotpepperwax.com
520-825-2038 fax
Email: arbico@aol.com Hydro-Gardens, Inc.
http://www.arbico.com PO Box 25845
Colorado Springs, CO 80932
Beneficial Insectary 719-495-2266
14751 Oak Run Rd. 719-531-0506 fax
Oak Run, CA 96069 http://www.hydro-gardens.com
800-477-3715
530-472-3523 fax International Technology Services Inc.
Email: bi@insectary.com PO Box 19227
http://www.insectary.com Boulder, CO 80308-2227
303-473-9141
303-473-9143 fax
Email: intertechserv@worldnet.att.net
// GREENHOUSE IPM: SUSTAINABLE APHID CONTROL Page 5
6. IPM Laboratories Olympic Horticultural Products
PO Box 300 PO Box 1885
Locke, NY 13092-0099 Bradenton, FL 34206-1885
315-497-2063 800-659-6745
315-497-3129 Fax 888-647-4329 fax
http://www.ipmlabs.com Email: olympic@hortnet.com
http://www.hortnet.com/olympic
Koppert Biological Systems
2856 Main St. South Praxis
Ann Arbor, MI 48103 2723 116th Ave.
313-998-5589 Allegan, MI 49010
313-998-5557 fax 616-673-2793
http://www.koppert.nl/english/index.html 616-673-2793 fax
Email: praxis@datawise.net
M&R Durango, Inc. http://www.praxis-ibc.com
PO Box 886
Bayfield, CO 81122 Rincon-Vitova Insectaries, Inc.
970-259-3521 PO Box 1555
970-259-3857 fax Ventura, CA 93002
http://www.goodbug.co 800-248-2847
805-643-6267 fax
Mycogen Crop Protection Email: bugnet@west.net
5501 Oberlin Dr. http://www.rinconvitova.com
San Diego, CA 92121
800-745-7476 SePRO Corp.
619-453-9089 fax 11550 N. Meridian St., Suite 180
Email: soares@mycogen.com Carmel, IN 46032-4562
800-419-7779
Mycotech Corp. 317-580-8290 fax
PO Box 4109 Email: rogers@sepro.com
Butte, MT 59702-4109 http://www.sepro.com
800-383-4310
406-782-9912 fax Soil Technologies Corp.
Email: mycotech@montana.com 2103 185th St.
Fairfield, IA 52556
Natural Pest Controls 800-221-7645
8864 Little Creek Dr. 515-472-6189 fax
Orangeville, CA 95662 Email: soiltech@lisco.com
916-726-0855 http://www.lisco.com/soiltech
916-726-0855 fax
Email: natpestc@cwnet.com Stoller Enterprises, Inc.
http://www.natural-pest-controls.com 8582 Katy Freeway, Suite 200
Houston, TX 77024
Nature’s Control 800-539-5283
PO Box 35 713-461-4467 fax
Medford, OR 97501
800-698-6250 Thermo Trilogy Corp.
541-899-9121 fax 9145 Guilford Rd., Ste. 175
Email: bugsnc@teleport.com Columbia, MD 21046
800-847-5620
301-604-7015 fax
http://www.thermotrilogy.com
// GREENHOUSE IPM: SUSTAINABLE APHID CONTROL Page 6
7. Wellmark International
1000 Tower Lane, Suite 245
Insect drawings courtesy of Hercules
Bensonville, IL 60106
800-842-3135 Powder Company; Wilmington, DE-
630-227-6065 fax Handbook of the Insect World 60p.
Whitmore Micro-Gen
3568 Tree Court Ind. Blvd.
St. Louis, MO 63122
800-777-8570
The electronic version of Greenhouse IPM:
Sustainable Aphid Control is located at:
By Lane Greer http://www.attra.org/attra-pub/gh-
NCAT Agriculture Specialist aphid.html
June 2000
The ATTRA Project is operated by the National Center for Appropriate Technology under a grant from the
Rural Business-Cooperative Service, U.S. Department of Agriculture. These organizations do not
recommend or endorse products, companies, or individuals. ATTRA is located in the Ozark Mountains
at the University of Arkansas in Fayetteville at P.O. Box 3657, Fayetteville, AR 72702. ATTRA staff
members prefer to receive requests for information about sustainable agriculture via the toll-free
number 800-346-9140.
// GREENHOUSE IPM: SUSTAINABLE APHID CONTROL Page 7
8. Appendix I: Beneficial Organisms
Organism Supplier Pests Controlled Application/Comments
Chrysoperla spp.
Amblyseius degenerans or M&R Durango,
Intl. Technology see above
aphids
(predator)
Iphiseius degenerans Florikan, Green Spot
Services, IPM Labs.,
(predatory mite) Green Spot
Coleomegilla imaculata
Aphidius colemani Arbico IPM Labs.,
Florikan, aphids, caterpillars,
aphids 1/sq. ft.; shipped as humidity should be 70-85%, temp. 65-77°F.
Release.5-2/sq. yd.; larvae and eggs.
(pink ladybird beetle)
(parasitic wasp) Harmony Farm mites, scales, thrips, Release at first sign of pests and for 3 consecutive weeks
Supply, Praxis, whiteflies thereafter. Sensitive to pesticides.
Rincon-Vitova, Green
Cryptolaemus montrouzieri Arbico, Caltec, Intl.
Spot aphids, mealybugs, 2-5/infested plant; humidity should be 70-80%, temp. 70-80°F.
(predator beetle) Technology Services, soft scales Larvae are cannibalistic; repeat as necessary for control; do not
Aphidius matricariae IPM Laboratories,
Arbico, Hydro- aphids 500-3000/A.while be used in greenhouses all year long.
wear white Can distributing.
(parasitic wasp) Natural Pest Controls,
Gardens, Green Spot
Nature’s Control,
Aphidoletes aphidimyza Florikan, Harmony
Nature’s Control, aphids 1-3/10 sq.ft.; humidity should be 50-90%, temp. 60-80°F. Release
(predator midge) Farm Supply, Hydro-
Intl. Technology when aphids are first observed; release lower numers for
Gardens, IPM Labora-
Services, Praxis, Rincon- preventive control; apply every two weeks. Active at night;
Vitova, Green Spot
tories, Hydro-Gardens, sensitive to daylength.
Arbico, Praxis, Rincon-
Deraeocoris brevis Green Spot
Vitova, Harmony Farm aphids, whiteflies,
(predator) Supply, Green Spot thrips
Diaretiella rapae
Chrysopa carnea Arbico, Pest Controls ,
Natural Praxis aphids caterpillars,
aphids, Release rates vary.
1 lacewing/5-30 aphids; 1000 eggs/200 sq. ft. Apply every 1-3
(parasite)
(predator) Beneficial Insectary, mealybugs, scales, weeks as needed. May arrive as eggs, immatures, or adults.
Caltec, Arbico, A-1 spider mites, thrips,
Harmonia axyridis Green Spot
Unique Insect Control, scale, whiteflies,
whiteflies Temps. should be 70-85°F; humidity around 70%.
(Asian lady beetle) Praxis, Rincon-Vitova, mealybugs, aphids
Hydro-Gardens
Hippodamia convergens A-1 Unique Insect aphids, mites, Release at dusk near an immediate food source. Spray plants
(lady beetle) (predator)
Chrysoperla rufilabris Control, Arbico,
Arbico, Beneficial whiteflies
see above with water prior to release.
(predator) Caltec, IPM Labora-
Insectary, IPM Labs.,
tories, Natural Pest
A-1 Unique Insect
Controls, Nature’s
Control, Nature’s
Control, Harmony Farm
Praxis,
Supply, Hydro-Gardens,
Rincon-Vitova
Praxis, Green Spot
9. Organism Supplier Pests Controlled Application/Comments
Iphiseius degenerans or Intl. Technology aphids
Amblyseius degenerans Services, IPM Labs.,
(predatory mite) Green Spot
Lysiphlebus testaceipes Praxis aphids
(parasitic wasp)
N. cucumeris and N. barkeri Hydro-Gardens thrips, aphids, mites 1 predator/sq. ft.; humidity should be moderate, temp.
70°F. Establish population early. Repeat every month
during periods of warm, dry weather.
Orius insidiosus Florikan, IPM aphids, caterpillars, 1/10 sq. ft. (preventive), 1 every 2 sq. ft. when pests are
(minute pirate bug) Labs., Harmony Farm thrips, whiteflies, present. Temperature should be 70-90°F. Orius are
(predator) Supply, Arbico, mites dormant September–April. Re-apply every 2-3 weeks.
Hydro-Gardens, Very susceptible to pesticides. Works well in combina-
Praxis, Koppert, tion with Neoseiulus cucumeris.
Intl. Tech. Services,
Green Spot
Propylea
quatuordecimpuncata Praxis aphids
(predatory beetle)
10. Appendix II: Biorational Pesticides
Azadirachtin – extract of neem seed; IGR that works through contact or ingestion
Brand Name Supplier Pests Controlled REI Application/Comments
Azatin Green Spot aphids, caterpillars, fungus 4 hours Apply when pests first appear.
gnats, leafhoppers, leafminers,
Western flower thrips,
whiteflies, psyllids
Neemazad Thermo aphids, caterpillars, thrips, 12 hours Cannot be applied through irrigation. Low rate can be
Trilogy greenhouse whitefly, leafminers, used as a preventative.
sweetpotato whitefly, psyllids,
leafhoppers
Beauveria bassiana – fungus that works through contact; exposure to non-target insects should be avoided
Brand Name Supplier Pests Controlled REI Application/Comments
Naturalis-O SePro aphids, caterpillars, mites, 4 hours Apply when insects first appear and repeat every
psyllids, thrips, whiteflies 7-10 days. Need good spray coverage. Not
compatible with other fungicides.
BotaniGard Mycotech giant whitefly, green peach 12 hours See above.
aphid, black vine weevil,
other aphids and whiteflies,
thrips, leafhoppers, psyllids,
white grubs
11. Garlic extracts
Brand Name Supplier Pests Controlled REI Application/Comments
Garlic Gard Soil Tech- repels aphids and other insects
nologies
Garlic Barrier Green Spot repels aphids and other insects 4 hours Use late in the day. Can be mixed with fish oil or
horticultural oil. Do not use in combination with
bumblebees or honeybees.
Horticultural oil – includes dormant and summer superior oils
Brand Name Supplier Pests Controlled REI Application/Comments
All Seasons Green Spot aphids, mealybugs, scales, 4 hours Use on sunny days to promote rapid drying and
thrips, whiteflies, spider decrease chance of phytotoxicity. Not compatible
mites with beneficials.
Hot pepper wax – contains capsaicin, paraffin, and mineral oil
Brand Name Supplier Pests Controlled REI Application/Comments
Hot Pepper Green Spot aphids, loopers, beet army- 4 hours Also contains herbal essential oils. Not compatible
Wax worms, mites, whiteflies, with beneficials.
thrips, mealybugs, etc.
Hot Pepper Hot Pepper see above 0 hours
Wax Wax, Inc.
12. Insecticidal soap – contains potassium salts of fatty acids
Brand Name Supplier Pests Controlled REI Application/Comments
M-Pede Mycogen aphids, mealybugs, scales, 12 hours Phytoxicity is often a concern, esp. after
thrips, whiteflies, spider repeated applications.
mites
Safer Green Spot see above 4 hours See above.
Insecticidal Olympic see above
soap
Neem oil – multi-purpose organic insecticide/fungicide/miticide; kills eggs, larval and adult stages of insects
Brand Name Supplier Pests Controlled REI Application/Comments
Trilogy 90EC Thermo greenhouse whitefly, silver- 4 hours Apply at first signs of damage. Repeat every 7-10 days
Trilogy leaf whitefly, sweetpotato as needed.
whitefly, thrips, whiteflies,
leafminers, aphids, mites,
psyllids, San Jose scale, scale,
spider mites, downy mildew,
powdery mildew, Alternaria,
Botrytis, etc.
Triact 90EC Thermo see above 4 hours For ornamental crops only.
Trilogy
Soybean oil
Brand Name Supplier Pests Controlled REI Application/Comments
Golden Natur’l Stoller aphids, fungus gnats, lace 12 hours
Spray Oil bugs, leafminers, scales,
mealybugs, spider mites,
whiteflies