Frequently Asked Questions EAB in Iowa August 6
Frequently Asked Questions: EAB in Iowa – August 6, 2020
1. What is the Emerald ash borer? Small adult insect – ½ ” long x 1/8” wide
Larval feeding ‘slowly’ kills the tree because it can’t circulate nutrients
2. What does EAB eat?
• Green ash • White ash • Black ash • Blue ash • Pumpkin ash
Common ash selections… White Ash ‘Autumn Applause’ Autumn Purple® Northern Blaze™ ‘Rosehill’ Skyline ® Green Ash ‘Bergeson’ Cimmaron ® ‘Marshall Seedless’ ‘Patmore’ Prairie Spire™ ‘Summit’
Non-Ash host: White fringetree, Chionanthus virginicus
3. Where is EAB from? 20+ species including F. chinensis F. mandshurica
EAB likely introduced in the 1990’s on wood packaging material originating from Asia
4. How did it get to Iowa?
People move EAB
5. Should I be concerned about EAB?
Tree mortality is essentially complete
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6. How do I know I have an ash tree? Two sources to check on tree identification: • https: //store. extension. iastate. edu/Item. Detail. aspx? Product. ID=1482 Common Problems of Ash Trees • www. extension. iastate. edu/forestry/iowa_trees/tree_id. html
Green ash White ash
7. How do I know if my ash tree is infested? • Thinning crown, dying branches
7. How do I know if my tree is infested? • Epicormic growth, water sprouts, suckers
7. How do I know if my tree is infested? • Adult feeding notches margins of leaflets D. Mc. Cullough, Michigan State
7. How do I know if my tree is infested? • Woodpecker activity
Woodpecker activity
7. How do I know if my tree is infested? D-shaped exit hole S-shaped larval feeding
8. For counties not yet known to have EAB, who can help me determine if my ash tree is infested? • State Entomologist: 515 -725 -1465 • Iowa DNR: 515 -725 -8453 • ISU Extension: 515 -294 -1101
9. Who should be thinking about treating ash trees? • Within 15 miles of a known infestation and the ash tree is healthy • Outside 15 miles – treatment may be premature
10. EAB Management Options PM PM 208 4 S 208 4
EAB chemical control (continued) • Healthy, vigorously growing, and valuable to your landscape • Do it yearly or every other year (depending on active ingredient) for life of tree • One active ingredient (emamectin benzoate) is injected every other year • Preventive treatments most effective; curative may work if less than 30% dieback of the canopy
EAB chemical control (continued) • Ash trees within 15 miles of confirmed EAB site are at risk of EAB attack; preventive treatments suggested within this risk zone • Based on recommendations from EAB researchers at Michigan State University and Ohio State University
EAB chemical control (continued) • Systemic insecticides require time and active tree growth prior to adult EAB activity: – soil-injections 4 -8 weeks – trunk injections 2 -4 weeks • Spring application shown to be most effective for most preventive products
EAB chemical control (continued) • Homeowner treatments for ash trees up to 60” circumference (20”dbh) for soil treatments • Granular applications for ash trees up to 36” circumference (12”dbh) • Homeowner applications once/year • Larger trees should be treated by certified pesticide applicator
Canopy sprays are not recommended • Limited effectiveness • Equipment needs • Spray drift likely due to tall ash trees in Iowa • Possible adverse effects to nontargets
11. Pesticide sales offers? • If you live within 15 miles of a confirmed EAB infested site, get estimate for the treatment. Obtain an additional estimate before any work is done • If you live outside the risk zone, thank them for their interest and keep their information on file
2010 -2013 • Allamakee • Des Moines • Jefferson • Cedar • Union 12. Where has EAB been found in Iowa? 2016: • Adair • Adams • Clarke • Harrison • Iowa • Johnson • Louisa • Washington • Winneshiek • Van Buren 2014: • Appanoose • Boone • Black Hawk • Bremer • Jasper • Henry • Lucas • Mahaska • Marion • Monroe • Muscatine • Story • Wapello 2015: • Clinton • Dallas • Davis • Dubuque • Keokuk • Lee • Linn • Montgomery • Polk • Poweshiek • Scott 2020: • Audubon • Cerro Gordo • Guthrie • Sac • Webster 2017: • Benton • Buena Vista • Butler • Clayton • Fayette • Floyd • Greene • Howard • Jackson • Madison • Ringgold • Warren • Wayne 2019: • Cass • Chickasaw • Franklin • Jones 2018: • Buchanan • Carroll • Crawford • Delaware • Grundy • Hamilton • Hardin • Marshall • Page • Tama • Taylor • West Pottawattamie
13. EAB response plan? http: //www. extension. iastate. edu/pme/ Emerald. Ash. Borer. html Or just “Google” ISU PSEP EAB
14. What does EAB quarantine mean? • Stop movement of infested ash materials (logs, trees, firewood, wood chips) • IDALS and USDA APHIS works with commercial wood products industries to comply with quarantine
15. How many counties in Iowa have been quarantined? • As of February 4, 2014, the Iowa Department of Agriculture and Land Stewardship quarantined all 99 counties in Iowa for emerald ash borer
16. Disposal of infested ash wood? • Iowa residents are asked to use or dispose of EAB infested wood within their county • Contact your local government or county extension office if you have questions
17. Use mulch from ash tree? • If chip size is 1 inch x 1 inch or smaller (in two dimensions), chips can be used without concern. • If chips are larger, best to bury or burn these chips (see local ordinance) as soon as practical to prevent spreading EAB into new areas.
18. EAB infested ash as firewood? • Once ash tree is cut into pieces, can be used as firewood on your property • DON’T take infested firewood on camping trips, hunting trips, tailgating or other places! Let’s LIMIT the spread EAB!
19. Other wood uses for ash trees? Portable sawmill
19. Other wood uses for ash trees? Ash lumber
19. Other wood uses for ash trees? Chainsaw debarker attachment
19. Other wood uses for ash trees? Sawmill debarking machine
20. Recommendations for communities? • Iowa Department of Natural Resources Foresters – Tivon Feeley 515 -725 -8453 – Emma Hanigan 515 -249 -1732
21. Current EAB information? • National EAB Web site: www. emeraldashborer. info • ISUE’s Web site: http: //www. extension. iastate. edu/ psep/Emerald. Ash. Borer. html
22. Who is a local contact? Your County Extension office!
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