ProHort

Continuing education for horticulture professionals
at the Center for Urban Horticulture and Washington
Park Arboretum

SPRING 20 0 3 OFFERINGS

Basic Pruning

Friday, March 7

Diagnosing Arthropod Pest Damage on Landscape Plants

Tuesday, April 8

Common Root Rots in the Pacific Northwest:
Recognition, Cultural, Biological and Chemical Controls

Thursday, May 15

UNIVERSITY OF WASHINGTON
COLLEGE OF FOREST RESOURCES

for URBAN HORTICULTURE

CENTER

for URBAN HORTICULTURE

Basic Pruning

Friday, March 7, 9 a.m. to noon
Graham Visitors Center, Washington Park Arboretum
Instructor: Bess Bronstein, Horticulture Consultant
and Edmonds CC Instructor

Fee $35; Pre-registration required.

ISA RECERTIFICATION CREDITS PENDING
CPH CREDITS AVAILABLE THROUGH WSNLA

This class at the Washington Park Arboretum will cover
specific techniques to prune a variety of trees and shrubs.
The class will then go into the arboretum for a
demonstration of the techniques that were discussed. Please
dress warmly and bring rain gear if needed.

Diagnosing Arthropod Pest
Damage on Landscape Plants

Tuesday April 8

NHS Hall, Center for Urban Horticulture

10 a.m. to noon

Fee $25; pre-registration required.

WSDA PESTICIDE RECERTIFICATION CREDITS PENDING
ISA RECERTIFICATION CREDITS PENDING
CPH CREDITS AVAILABLE THROUGH WSNLA

Arthropods are animals with tough outer skeletons, segmented
bodies, and jointed legs, examples of which include insects,
spiders, cockroaches, and millipedes. Most arthropods are
harmless to plants, but some are considered pests. Diagnosis is
the first step in a good IPM program. Accurately identifying
pests and/or their damage is important to prevent unneeded
management strategies. Not only is it important to avoid
unneeded chemical applications, but to also avoid impacting
non-target organisms. Dr. Art Antonelli, WSU Extension
Entomologist, will address twelve categories of arthropod pest
damage, from stipling to galling, and many signs and
symptoms in between. He will show slides and provide
students the opportunity to practice identifying signs and
symptoms of damage likely to be seen in the Puget Sound area.

Common Root Rots in the
Pacific Northwest:

Recognition, Cultural, Biological &
Chemical Controls

Thursday May 15, 8:30 a.m. to noon
NHS Hall, Center for Urban Horticulture
Instructor: Dr. Olaf Ribeiro, Plant Pathologist
Fee $35; Pre-registration required.

WSDA PESTICIDE RECERTIFICATION CREDITS PENDING
ISA RECERTIFICATION CREDITS PENDING
CPH CREDITS AVAILABLE THROUGH WSNLA

This course will cover the diagnosis and control of com-
mon root rots encountered in nurseries and landscapes in
the Pacific Northwest. The first half of the class will go
over Phytopthera diseases and the second half will cover
other common root rots. Discussion on an IPM approach
to control the pathogens described will be included. This
will encompass the valuation of chemicals, biological
controls and cultural practices such as the use of composts
and soil amendments. Dr. Olaf Ribeiro is owner of Ribeiro
Plant Lab, Inc. and is author of A Source Book of the Genus
Phytophora and co-author of Plant Diseases Worldwide.

Coming Soon!

West Nile Virus Workshop

For information on this developing program, check the
website at www.urbanhort.org.

West Nile Virus reached the state of Washington in 2002
and is here to stay. This workshop will be targeted to
journalists, garden consultants, volunteers, and others who
will, in turn, teach or offer advice to others. Included will
be topics on the disease itself and its symptoms, history,
and who is most at risk; mosquito biology and control;
personal protection from mosquitoes; garden and property
management; protection for animals; and gimmicks, myths,
and shysters to avoid.

Cooperating organizations include:

•UW School of Public Health & Community Medicine
•UW Medical School, Dept, of Comparative Medicine

•Washington Cooperative Fish & Wildlife Research Unit
of the UW School of Aquatic & Fisheries Science
•U.S. E.P.A. Region 10

There is still time to register for the “Tools and Techniques
to Manage the Urban Forest” symposium to be held on
March 13 and 14,2003 at CUH.The symposium will review
how urban forestry, environmental horticulture, and social
sciences create strategies to manage natural resources in the
urban environment. For registration and schedule information,
check the web site at www.urbanhon.org or phone
206-685-8033.

Linda Chalken-Scott named “Educator of the Year” for

2002 by WSNLA, The Washington State Nursery and
Landscape Association has awarded Dr. Linda Chalker-Scott of
CUH the Educator of the Year award for 2002. Linda writes a
monthly column titled ‘Of Myth and Men’ for the WSNLA
newspaper “B&B” and is an Associate Professor of Plant Stress
Physiology and Sustainable Landscape Management. Students in
her classes have gained valuable real-life experience in designing
and installing sustainable urban landscapes. Congratulations,
Linda, for this well-deserved honor.

Could trees actually be the cause of air pollution?

St. Louis has some of the highest formaldehyde air pollution
levels in the country so researchers at EPA and Washington
University are conducting a study to pinpoint the source of
these unusually high levels. Cars and industries are known
contributors of formaldehyde but the oak forests surrounding
St. Louis are also suspect since oak trees give off isoprene that
reacts with sunlight and water to create formaldehyde.
Monitors are being installed near the forest to determine the
actual contribution from the oaks, http://chblue.com/artman/
publish/ article, _l I I5.shtml

Reprinted with permission of the Weekly NMPRO e-mail newsletter

Seed Germination without Soil. One of the basics of
horticultural science has been overturned. A new study claims
that water vapor, not liquid water, is the necessary ingredient in
soil to cause germination. Previously it was assumed that seeds
must be in direct contact with soil to obtain water needed for
germination. Stewart Wuest at the Agricultural Research
Service showed that seeds separated from the soil by crop
residue, fiberglass cloth, or even air germinated just as well as
when they were in contact with soil. The results will influence
water absorption models and potentially the design of seeding
equipment, www.ors.usdo/gov/is/pr/2003/030/ 7.htm

Reprinted with permission ofThe Weekly Dirt e-mail newsletter

CENTER FOR URB/VN HORTICULTURE

3501 NE 41st Street
University ofWashington
Box 354115

Seattle, WA 98195-4115

Phone: 206-543-8616
Fax: 206-685-2692

www.urbanhort.org

WASHINGTON PARK ARBORETUM

2300 Arboretum Drive East
University ofWashington
Box 358010

Seattle, WA 98195-8010

Phone: 206-543-8800
Fax: 206-616-2871

www.wparboretum.org

The University ofWashington is committed to providing access, equal
opportunity and reasonable accommodation in its services, programs, activities,
education and employment for individuals with disabilities. To request disability
accommodation contact the Disability Services Office at least ten days in advance
at: 206-543-6450 (voice), 206-543-6452 (TTY), 206-685-7264 (fax), or e-mail
dso@u.washington.edu.

registration form C

UNIVERSITY OF WASHINGTON
COLLEGE OF FOREST RESOURCES

/orURBAN HORTICULTURE

350 1 NE 4 I st Street
University of Washington
Box 354115

Seattle, WA 98195-41 15

NONPROFIT ORG.
U.S. POSTAGE

PAID

SEATTLE, WA
PERMIT NO. 62

09-9615

IIIKIIIIIilllllllllllllllllllllllllllllllllllllllllll

Spring 2003 Seminar Registration

CUH accepts checks,
VISA, and MasterCard.

Make checks payable to
the University of
Washington. Receipts
available at the door.

O Basic Pruning, March 7

$ 35

O Diagnosing Arthropod Pest Damage on Landscape Plants, April 8

$25

O Common Root Rots in the Pacific Northwest, May 15

$ 35

TOTAL $

Mail payment and
registration to:

Center for Urban
Horticulture - ProHort
University of Washington
Box 354115

Seattle, WA 98195-41 15

For information,

call 206-685-8033.

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