IPM OF ROSE PESTS
Baldo Villegas
Entomologist; ARS Master Rosarian
Sacramento, CA USDA (Zone 8/9)
EMail: sactorose@yahoo.com
Home Page: http://www.sactorose.org/
An America Rose Society Presentation ©2005
INTRODUCTION
There
are many different types of organisms
(insects, mites, diseases) in the home garden
Very few are pests!
Many beneficial organisms are present
Correct identification of the pest is essential
for proper control
SOURCES OF INFORMATION

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Universities – UC, State, Community Colleges
Cooperative Extension Offices
State Department of Agriculture
County Department of Agriculture
Local Nurseries – CA Nursery Association
SOURCES OF INFORMATION (cont.)
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Libraries
Internet
Private Sector
1. Local Nurseries especially members of the
CA Nursery Association
2. Pesticide & Landscape Outlets
3. Pest Control Advisors (PCA’s)
4. Private Horticulture Experts
BALDO’S FAVORITE INTERNET IPM SITES
http://www.sactorose.org
- Baldo’s Bugs &
Roses Website
http://www.ipm.ucdavis.edu - UC IPM
Online
http://entnemdept.ifas.ufl.edu/publicat.htm University of Florida – Entomology &
Nematology Publications
http://www.apsnet.org - The American
Phytopathological Society
IPM REFERENCE BOOKS

Dreistadt, Steve H. 1995. Pests of Landscape Trees and Shrubs.
University of California. DANR Publication 3359. Oakland, CA 327p.
ISBN#: 1-879906-18-X. 3Price $32.

Flint, Mary Louise. 1990. Pests of the Garden and Small Farm - A
Grower’s Guide to Using Less Pesticide. University of California.
DANR Publication 3332. Oakland, CA 276p. ISBN#: 0-931876-89-3.
Price $25.

Cranshaw, Whitney. 1992. Pests of the West - Prevention and Control for
Today’s Garden and Small Farm. Fulcrum Publishing, Golden,
Colorado, 275p. ISBN#: 1-55591-097-1. Excellent book for IPM in
North America at a very reasonable price! Price $18.95.

Davidson, R. H. and William F. Lyon. 1987. Insect Pests of Farm,
Garden and Orchard, 8th Edition, John Wiley & Sons, NY, 556p.
IPM REFERENCE BOOKS (cont.)

Essig, E. O. 1926. Insects of Western North America. The MacMillan
Company, NY, 1035p. This book has been out of print for many years. It
is the best Book around for insect biologies for western insects.

Horst, Kenneth R. 1983. Compendium of Rose Diseases. APS Press, The
American Phytophathological Society. St. Paul MN, 50p. Best book for
rose diseases! Order: The American Phytophathological Society, 3340
Pilot Knob Road, St. Paul, MN 55121, USA. ISBN#: 0-89054-052-7.
Price - $35.

Johnson, Warren T. and Howard H. Lyon. 1988. Insects that Feed on
Trees and Shrubs,, 2nd edition, Cornell University Press, Ithaca, NY,
556p. ISBN#: 0-8014-2108-X. One of the best books for ornamental
pests in North America. Price $50.
INTEGRATED PEST MANAGEMENT (IPM)
IPM is an environmentally sound
integration of all control methods to control
pest populations below economic or
damaging levels
IPM STRATEGIES
Prevention
Pest
& Symptom Identification
Regular Survey for Pests (presence or
symptoms)
Establish Action Thresholds &
Guidelines
IPM METHODS
Cultural
Control
Mechanical & Physical Control
Biological Control
Chemical Control
CULTURAL CONTROL
Growing
healthy plants
Buying pest-free plant materials
Choosing resistant varieties
Choosing the planting site
Fertilization - too much or too little
Sanitation - removal of infected plant
materials
Watering methods
MECHANICAL & PHYSICAL
 Barriers
- e.g., copper banding for snails/slugs
 Mulching - for weed control & water
conservation
 Solarization - for control of weeds and diseases
 Hosing & Syringing - for control of aphids, mites,
& powdery mildew
 Handpicking & Crushing - for many large insects
and beetles
 Hoeing - for weed control Trapping - e.g.,
pheromone traps for tobacco budworms
BIOLOGICAL CONTROL
Parasites
(Parasitoids) - e.g., parasitic
wasps & flies
Predators - e.g., lady beetles &
lacewings
Diseases - e.g., milky spore for
Japanese Beetle, beneficial nematodes,
etc.
CHEMICAL CONTROL
 Inorganic
Pesticides - Derived from elemental sources:
Sulfur
 Organic Pesticides - Synthetic pesticides further
classified by chemical families and modes of action.
 Botanical Pesticides - Derived from plant materials:
Pyrethrum, rotenone, rynia, bioneem, pepper oil, etc.
 Microbial Pesticides - Derived from microbial
organisms: Bacillus thuringienses
SIGNAL WORDS
These words give information on the relative toxicity
and corrosiveness of the pesticide
 POISON:
Highly Toxic - Nicotine Sulfate
 DANGER: Highly Toxic - Funginex (Triforine)
WARNING: Moderately Toxic - Roundup
 CAUTION: Slightly Toxic - many botanicals &
microbial pesticides
Garden Insecticides - Systemics
Insecticides – Contact - Residual
Insecticides – Contact – No Residue
Insecticides - Microbal
WHO DID THIS DAMAGE?
Aphids
Aphid Natural Enemies
Aphis Wasp
Dead Aphid From Aphid Wasp
Lady Beetle
More Aphid Natural Enemies
Lacewing Adult
Cecidomyiid Midge Larva
Cecidomyiid Midge Adult
Lacewing Larva
Lacewing Eggs
Sooty Mold – usually grows on top of
honeydew produced by sucking insects
Ants – commonly found on honeydew
produced by sucking insects
Mealybugs
Whiteflies
Rose Scale – common on berry bushes
San Jose Scale – common on fruit trees
Scale Insect Natural Enemies
Red Scale Wasp (Aphytis melinus)
Red Scale Wasp Larva
On Scale
Spittlebugs – unsightly “spit” or foam
Spider Mites – suck individual cells dry
Two-Spotted Spider Mites
Flower Thrips – very tiny insects!
Commonly found causing damage to rose petals
Western Flower Thrips
Rose Midge – tiny mosquito like flies,
feeds on the apical buds of roses
Katydids – long horned grasshoppers
Snails & Slugs – leave a silvery slime
trail behind
Control Measures For Snails
Baldo Squish
Copper Band
Diabrotica or Cucumber Beetles
Rose Curculios – feeds on early flower buds
Rose Curculio – damage to buds
Other Beetles: Hoplia, Japanese beetles,
Stem girdlers, etc.
Fruit Tree Leafroller Caterpillars
Tobacco Budworms - commonly migrate from
companion plantings
Marmara Cambium Miners
Bristly Rose Slug – skeletonizes leaves
European Rose Slug – skeletonizes leaves
Rose Stem Sawfly Damage on Rose
Rose Stem Boring Sawfly
Aka – Raspberry Stem Boring Sawfly
Cane Boring Insects
Predatory aphid wasp
Most cane boring insects are predaceous on other insects and use
rose stems for nesting
Cynipid Gall Wasps – cause galls on
leaves, stems & roots
Leafcutter Bees – do not eat leaves; they use them
for lining nests
Learn To Recognize The Good Bugs Of The Garden
Lady Beetle
Larva
Parasitized
Aphid – A
“Mummy”
Leatherwinged
Beetle
Ground Beetle
Scale Feeding Lady Beetle
Larvae, Pupae & Adult
Lady Beetle
Pupae
Mealybug
Destroyer
Lady Beetle
Larvae
Watch out for the Lady Beetles!
Beneficial Hover Fly - larvae look like
caterpillars but they are not!
Baldo’s Squish Technique
The Squish Technique – works on other
organisms
IPM IN THE HOME GARDEN
Establish
damage levels for your own
garden
Make observations and record them
Correctly identify the pest
Take the appropriate action; sometimes
the appropriate action is no action
The End