Transcript Basic Botany - University of Wisconsin–Extension

Woody Plants
PLANT DETECTIVES
Directions
• Consider the information presented in each
scenario
– What is useful?
– What is not useful?
– What is missing?
• Based on the information provided determine
a possible solution for the client
• Use an IPM approach for each of your answers
Goal
• Based on information provided by client,
determine possible cause(s) and present range
of solutions client can choose.
– You are NOT telling the client what to do
– You are educating the client on the control
options available
What you need:
• N3959 or other access to publications
When you see these:
• After you have come up
with your own answers,
listen to our suggested
reply to the client.
• Click on these icons
when you see them in
the presentation.
– Must be connected to
the internet
Woody Plants
PLANT DETECTIVES
Scenario 1
Mr. Brown is very concerned
about irregular spots on the
leaves of his maple trees. He
has called you on the Extension
Garden Hotline and wants to
know if he should cut down the
tree immediately to prevent
those blotches from spreading
to his ash tree and roses.
Scenario 1
This spring has been very wet and humid. He
tells you that he hasn’t seen any spots on his
rose bushes yet, but last year most of the leaves
fell off.
His ash tree has spots, too. Mr. Brown wonders
if that is Emerald Ash Borer.
Scenario 1
• What is the most likely problem called?
• Using an IPM strategy, what information would
you give Mr. Brown?
Discuss these questions before
continuing to answer on next slide
Scenario 1
Anthracnose
– http://hort.uwex.edu/articles/anthracnose
• Irregular spots and dead areas on
leaves that often follow the veins
of the leaves
• Often tan or brown
• Not many insects create spots
on leaves.
• Often on lower portions of
• Many people, when they hear
about new pests, attribute any
canopy
new problems to those.
• Sometimes twig dieback
• Cutting down a tree is pretty
extreme response – think first!
Scenario 1
• Several diseases caused by different fungi
specific to their own plants.
• Ash, maple, white oak, sycamore, and walnut
are commonly affected.
• Typically affects young
tissue.
• Primarily cosmetic.
Anthracnose on silver maple
Photo by University of Illinois
Scenario 1
Management options include:
• Tolerate, unless severe
• Sanitation
• Maintain tree vigor
– water, fertilize appropriately
• Fungicides
Scenario 1
During the weekly Horticulture Update, Brian Hudelson
often reports on common diseases. The week Mr. Brown
called, Brian mentioned many samples of oak, ash, and
maple leaves coming into the lab with spots that were
diagnosed as anthracnose. Listening to this live program
(or the archives) will alert you
to current issues.
http://fyi.uwex.edu/wihortupdate/
ANTHRACNOSE is one of the
few diseases you can
diagnose own your own –
most have to be sent to the
lab for confirmation.
Scenario 2
• Mrs. Oler has moved
into a new house and
has severely
overgrown bushes
and wonders what
her options are to
whip them back into
shape?
I have an overgrown
shrub in my new yard.
Please tell me how to
prune it.
Thanks in advance,
Mrs. O.
Scenario 2
She e-mails a picture of the offending shrubbery.
My neighbor
says it’s a
lilac bush
and that the
previous
homeowner
never pruned
it.
Scenario 2
• Based on the information provided, what is
your response to Mrs. Oler?
• Using an IPM strategy, what information would
you give her?
Discuss these questions before
continuing to answer on next slide
Scenario 2
Management Options Include:
• Proper identification
• Expectations
• Pruning options
– Cut back
– Thin
– Rejuvenate
• Future management recommendations
Scenario 3
• Mrs. Daisy Astor lost a magnolia last year to
verticillium wilt (diagnosed by the UW Plant
Disease Diagnostic Clinic). She now would like
your advice for a new tree to put back into
that spot.
Scenario 3
• She wants something that will be a small to
medium sized tree and has
some ornamental qualities.
• The spot gets sunlight most
of the day and drains well.
• What tree(s) would you
suggest she consider?
Discuss these questions before
continuing to answer on next slide
Scenario 3
Consult appropriate resources
– http://learningstore.uwex.edu/Assets/pdfs/A3864.
pdf (Choosing the Right Landscape Plants: factors
to Consider)
– http://hort.uwex.edu/articles/verticillium-wilt
• Choosing plants that are not
susceptible to verticillium wilt is the
most critical
• Finding what meets her aesthetic
needs is secondary
Scenario 3
• Vert resistant trees:
– apple, aspen, azalea, beech, birch, butternut, crabapple,
dogwood, flowering quince, ginkgo, hackberry, hawthorn,
hickory, holly, honeylocust, katsura tree, mountain-ash,
oak, pear, poplar, sweetgum, sycamore, walnut, and
willow. Conifers are also resistant.
• Which ones meet her requirements?
– Crabapples, pagoda dogwood, flowering quince, hawthorn,
mountain-ash, ornamental pear, and possibly some small
cultivars of katsura tree are all small to medium-sized and
prefer full sun.
Scenario 4
• Mr. Spector calls the UWEX office with
concerns about the large tree on the north
side of his home.
• It has large dead branches throughout the
canopy. He knows emerald ash borer is a
problem so wonders if his tree has it. He
wants to know if should he cut the tree down.
Scenario 4
• Do you have enough information to properly
answer the question?
• What other information would you need?
• How should you direct Mr. Spector?
Discuss these questions before
continuing to answer on next slide
Scenario 4
Need more information
– Bring in a branch to ID species
• http://learningstore.uwex.edu/Assets/pdfs/A3864.pdf (Choosing the
Right Landscape Plants: factors to Consider)
–
–
–
–
–
Submit a picture of the symptoms and signs
Determine history of site
Possibly submit sample to Plant Disease Diagnostic Clinic
NEVER advise to remove a large tree
Recommend homeowner hire a certified arborist for
complete inspection
• http://www.waa-isa.org/ (Wisconsin Arborist Association)