Emerald Ash Borer. mda.state.mn.us/eab
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- Hortense Patrick
- 5 years ago
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Transcription
1 Emerald Ash Borer
2 Agenda Emerald Ash Borer Life Cycle Host Trees Recognizing EAB Signs & Symptoms Distribution Regulations Management Reporting Questions
3 Life Cycle
4 Life Cycle J a n F e b M a r A p r M a y J u n J u l A u g S e p O c t N o v D e c Immature (under bark) Adult (free living)
5 How Does EAB Kill Trees?
6 Host Trees
7 Ash Tree ID
8 Ash Tree ID
9 City of Lakeville Ash Population Top 5 Tree Types - Parks 9.50% 18.90% 9.80% Top 5 Tree Types - Facilities & Utilities 4.10% 9.10% 9.30% 36.70% 18.30% 18.80% 13.10% Maple Spruce Ash Oak Linden/Basswood Spruce Crabapple Pine Ash Juniper/Red Cedar
10 City of Lakeville Ash Population Top 5 Tree Types - Right-of-Ways 7.72% 7.46% 24.74% 17.19% 18.88% Maple Ash Spruce Linden/Basswood Crabapple
11 City of Lakeville Ash Population
12 City of Lakeville Ash Population City-Owned Ash Trees Total 2, est Right-of-Way Park City Facility & Utility 60
13 Recognizing EAB
14 Confirmation S shaped galleries EAB Larva
15 Confirmation 1/8 width D shaped exit holes EAB Adult
16
17 Signs & Symptoms
18 EAB Status Symptoms Symptom Progression Years Infested Small larvae present None 1 Large larvae present / Emerging adults Increasing larvae numbers Woodpecking possible 2 Woodpecking likely Bark splits possible Canopy impacts visible 4 Dead trees present 5-6 3
19 Woodpecker Damage Mid / Top canopy Branches 3-6 in diameter Bark transitions to rough Bark blonding / flaking Woodpecker holes Dime sized Light colored Oval shaped
20 Woodpecker Damage
21 Woodpecker Damage
22 Bark Splits
23 Native Damage Trunk Lower canopy Characteristic ash Dead limbs
24 Distribution
25
26 Interactive Map status Closest known infested ash tree
27 NE Lakeville: Generally Infested
28 Slow Spread Cold weather Education Outreach Aggressive management Quarantines Sanitation 100% 80% 60% 40% 20% 0% % of Counties Infested with EAB by Years of Infestation U.S. Average (31 states) Minnesota Updated 9/8/ Years of Infestation
29 Regulations mda.state.mn.us
30 Minnesota Quarantines Generally infested area in green within red EAB quarantined counties Restricted movement of Ash EAB All Hardwood Firewood (<4 feet in length)
31 Management
32 Best Management Practices May 2 through September 30 EAB Active Period Avoid removal of ash branches, trees, stumps October 1 through May 1 EAB Dormant Period Conduct pruning, removal of ash as desired Use all wood on site by May 1, or dispose of
33 Property Owner Management Options Removals Before EAB Trees exhibiting woodpecker damage Dead trees Treatments Before EAB After EAB infests a tree Do Nothing = False option Management choices decrease, price goes up
34 City of Lakeville Management Options Education & Outreach Inspections of suspicious ash Presentations/booths in community Ordinances Many cities require removal of infested trees from private land Policies Encourage species diversity Change timing for in-house ash tree work Favor removal unless tree is worth investment of treatment
35 City of Lakeville Management Options Structured Removals % each year Before EAB Poor and some fair condition Tree Replacements Parks and City Facilities Diverse species Treatments Before EAB vs. After EAB infests a tree based on budget Homeowner Bulk Treatment program
36 Considering Insecticides How close is EAB? How healthy is the tree? What is the tree s physical condition? How large is the tree? How close to water or storm drain? How many ash are there? How important is the tree?
37 Insecticide Treatments What is the risk? What about pollinators? Is your ash within 25 of a water body or storm drain? Treatments need to be repeated Timing is everything
38 Considering Insecticides What types? How much does it cost a homeowner? Example: Stem injection of emamectin benzoate based on diameter of tree and rate (medium to high appropriate) Without bulk treatment program, a 12 tree costs $ ($8-10 per diameter) With bulk treatment program, a 12 tree costs $66-81 ($ per diameter)
39 Insecticide Treatments Measure your ash tree
40 How Insecticides Work Systemic Moves up the xylem and into leaves Affects adults Can also move to the phloem and affect larvae
41 Other Programs
42 Forested Environments Egg Parasitoid Oobius agrili Larval Parasitoid Tetrastichus planipennisi Larval Parasitoid Spathius galinae
43 Biosurveillance Smoky winged beetle bandit wasp Cerceris fumipennis Volunteer Program Wasp Watchers
44 Reporting
45 Arrest the Pest Take pictures and notes Capture the insect or take a sample of the plant Report City forester, Emily Ball GLEDN app (Great Lakes Early Detection Network)
46 Thank you! Jennifer Burington Plant Health Specialist Emily Ball Lakeville City Forester