Transcript 2015 Treatment Options for EAB

Treatment Options
for Emerald Ash Borer
Dr. Mark Shour
PM 2084 Revised February 2015
• Recommended insecticides work best
as preventive treatments for healthy
ash trees
• Healthy trees have full crowns,
elongating branches, and bark tightly
held to trunk/branches
Preventive treatment
• Candidate ash trees are those planted
along streets, in yard, or park settings
• Treatment is not practical or cost
effective for woodlot trees where
timber production is the primary goal
Other control considerations…
1. Identify the target tree as ash
2. Set sentiment aside, then:
a. Judge health of tree
b. Assess landscape value
c. Determine cost/treatment X several years
3. Insecticide use for several years
(yearly or every other year)
National Tree Benefit Calculator
• Benefits include helping clean the air,
slow stormwater runoff, raise property
values, sequester carbon, and reduce
energy costs
• A 25” white ash tree has an estimated
annual economic benefit of $359 in Des
Moines, Iowa
www.treebenefits.com
Purdue Cost Calculator
• To run the calculator you will need:
– an inventory of the number and size of ash trees
– an estimate of costs for removing and treating
trees based on the size of each tree.
– an estimate of costs for replacing each ash tree
that is removed.
• 3 options: treat, remove, replace
http://extension.entm.purdue.edu/treecomputer/
Other control considerations…
4. Preventive treatments
most effective
• curative application
may work if less than
30% canopy dieback
• dead branches should
be removed
Other control considerations…
5. Ash trees within 15 miles of a
confirmed EAB site are at risk of
attack; treatments are suggested
– Keep checking trees for symptoms
outside of risk zone
EAB chemical control
• Systemic insecticides require time and
active tree growth prior to adult EAB
activity:
– Soil treatments 4-8 weeks
– Trunk injections 2-4 weeks
– Some products penetrate faster
Homeowner treatment options
Type of
application
Active
Ingredient
Tree Size
Time of
Application
Soil drench
Imidacloprid
(1.47%)
Up to 60”
(20” dbh)
Mid-April to mid-May or
Early Aug to mid-Sept
Soil drench
Imidacloprid
(21.4%)
Up to 60”
(20” dbh)
Early Aug to mid-Sept
Soil drench
Imidacloprid,
Clothianidin
Up to 60”
(20” dbh)
Mid-April to mid-May or
Early Aug to mid-Sept
Granular
Dinotefuran
(2%)
Up to 36”
(12” dbh)
Mid-April to mid-May
Granular
Imidacloprid,
Clothianidin
Up to 36”
(12” dbh)
Mid-April to mid-May
Granular
Imidacloprid
Up to 36”
(12” dbh)
Mid-April to mid-May
Trunk circumference
(diam. @ 4.5ft -dbh)
Homeowner treatment notes
• Carefully read the product label
before purchase & use
• Amount of insecticide depends on
tree’s circumference
• If label lists spring & fall as possible
treatment times, homeowners can
only treat ONCE per year
Homeowner EAB control
• Pull back mulch 12” from base of tree
• Soil drench treatment: trees up to 60”
circumference/20” diameter. Apply
spring every year.
• Granular treatment: trees up to 36”
circumference/12” diameter. Apply
spring every year.
Homeowner treatment notes
• Apply soil drench product. Return
mulch after product taken into soil.
• Don’t apply to
saturated or
frozen soils
• Apply granular products evenly
on soil around base of tree
within 18” of trunk
• Irrigate after application to
dissolve granules
• Reposition mulch at tree base
For larger trees…
• Treatment by commercial applicator
–Soil injection or drench
–Basal trunk spray
–Trunk injection
Professional treatment options
Product
Active
Ingredient
Application Method
Application Time
IMA-Jet
Imidacloprid
Trunk injection
Spring: Full canopy
Imicide
Imidacloprid
Trunk injection
Spring: Full canopy
Merit
Imidacloprid
Soil injection, drench
Spring, Fall
Merit
Imidacloprid
Trunk injection
Spring: Full canopy
Safari
Dinotefuran
Soil injection, drench; Basal bark spray
Spring
Transtect
Dinotefuran
Soil injection, drench; Basal bark spray
Spring
Tree-Age
Emamectin benzoate
Trunk injection
Spring – Fall: Full canopy
TreeAzin
Azadirachtin
Trunk injection
Spring
Xytect
Imidacloprid
Soil injection, drench
Spring, Fall
Zylam
Dinotefuran
Soil injection, drench; Basal bark spray
Spring
Per Acre Use Limitations for
Soil or Basal Trunk Treatments
• Professional product labels have
specific per acre use limitations
• Homeowner products give ‘once per
year’ limitation; some give maximum
product use per acre or 1000 sq. ft.
Per Acre Use Limits – Soil, Bark Trmts
Residence
(on ½ acre lot)
6 ash trees
Driveway
14”dbh
20”dbh
4”dbh
8”dbh
Residence
13” dbh
Driveway
8”dbh
4”
8”
8”
13”
14”
+ 20”
67”
67 total treatable inches DBH
Professional products
Active
Ingredient
Formulation
Max/
Acre/
Year
Imidacloprid
2F
1.6 pts
Imidacloprid
Dinotefuran
75WSP/
75WP
20 SG
0.53
lbs
2.7 lbs
Annual/
Acre Use
Limit
0.4
lbs/a.i.
0.4 lbs/
a.i.
0.54
lbs/a.i.
Treatment
Area
Max
Product/
Area/
Year
Total
Treatable
DBH –
Minimum
Rate
Total
Treatable
DBH
Maximum
Rate
>15” DBH
Total
Treatable
Max
Rate
1/8 acre
3.2 oz
32
16
EXCEEDS
½ acre
12.8 oz
128
64
32
1 acre
25.6 oz
256
128
64
1/8 acre
1.1 oz
32
16
EXCEEDS
½ acre
4.2 oz
128
64
32
1 acre
8.5 oz
256
128
64
1/8 acre
5.4 oz
51
13
N/A
½ acre
21.6 oz
206
52
N/A
1 acre
43.2 oz
412
104
N/A
14”dbh
Must use another
type of treatment
20”dbh
4”dbh
Treat
Must use another
type of treatment
Treat 8”dbh
Residence
Treat
13” dbh
Treat
8”dbh
“64 total inches
DBH to treat”
Canopy sprays
not recommended
• Limited effectiveness
• Need special equipment
• Spray drift likely
• Possible adverse effects
to nontargets
Commercial application techniques
Soil injection
Commercial application
techniques
Mauget trunk injection
Kioritz soil injection
Commercial application techniques
Arborjet system
Wedgle method
Commercial application techniques
iQ Tree infuser
Basal bark spray
Reference
• PM 2084 is available as PDF at
the ISU Extension Online Store
• [email protected]
• 515-294-5963