October 2022
MARK YOUR CALENDAR
 Annual member and party meeting
NOVEMBER 10, 2022
Join us for a fun evening of networking, recognizing achievements, food, and BEER!
The Member Meeting will feature:
- Past President Farewell from Scott McAdam, Jr., McAdam Landscaping, Inc.
- Recognizing 25 and 50 Year Members
- Sponsor Thank You
- Committee of the Year Announcement
The Annual Party will feature:
- Dinner
- 2 Hour Open Bar
- Networking and Fun
When: November 10, 2022
Where: Joe’s Live 5441 Park Pl, Rosemont, IL 60018 [map]
MORE INFORMATION
Illinois Arborist Association 40th Annual Conference & Trade Show
November 14-16th, 2022
Please join us at our 40th IAA Annual Conference!
Tinley Park Convention Center
18501 South Harlem Avenue
Tinley Park, IL 60477 [map]
EVENT DETAILS
Twolined Chestnut Borer
Adult twolined chestnut borer / Twolined chestnut borer larva.
Photos courtesy of Robert A. Haack, USDA Forest Service, Bugwood.org
A collaborative effort of Deerfield, Lake Forest, Northbrook, and the Morton Arboretum is aimed at trying to assure the current attack on oak trees by the twolined chestnut borer beetle will not be as severe as the devastation to ash trees by the emerald ash borer, a few years ago.
“We can very easily treat it,” said Corey Wierema, the head forester for the city of Lake Forest. “It’s always been here, but this year the infestation has been severe.”
Deerfield, Lake Forest, and Northbrook are currently working with the Morton Arboretum to gather information about the impact of the chestnut borer on oak trees in their towns so other Lake and Cook County communities can learn the best treatment when it spreads.
Wierema said weather conditions over the past seven years made the environment ripe for the chestnut borer this summer. He and colleagues in other communities started noticing the bug in June. High rainfall for five years, followed by dry conditions the past two, caused the outbreak.
“We started to put the pieces together,” he said. “When you have these conditions, it really puts a lot of stress on trees like the oak. Oaks can be temperamental and susceptible to the chestnut beetle. It can be very destructive. The infestation was higher than normal.”
Bob Phillips, Deerfield’s director of public works and engineering, said the three communities started noticing a greater infestation of the chestnut borer leading to the partnership with the Morton Arboretum.
Phillips said the three towns all have strong populations of oak trees and noticed similar conditions, like the crown of the trees starting to lose color in the leaves. They are working with the Morton Arboretum to track data to find solutions when the borer spreads elsewhere.
“They only attack trees in a weakened condition,” Phillips said. “The arboretum is gathering data over two years to learn as much as they can about the impact on the trees. It’s not going away. The beetle is able to travel.”
Along with working with the Morton Arboretum, Wierema said all three communities are putting information on their websites to educate their residents. Discoloration of the leaves is a potential sign.
“You should use supplemental water in dry periods if it hasn’t rained for a few days,” he said. “The roots need a pretty deep watering or a deep soaking.”
Kelly Hamill, the public works director for Northbrook, said there are things homeowners can do to protect oak trees on their property from infestation. Like Wierema, Hamill said people should let the hose or sprinkler soak the tree for a few hours.
If the tree is surrounded by grass with no ring of soil around it, Hamill said homeowners can remove a circle of grass and put mulch there to allow water to reach the root system more easily. Such treatment makes the trees less susceptible to beetle infestation.
“If you see a dying branch, remove it so the tree won’t be in stress anymore,” Hamill said. “You should separate it completely. Look for (other) signs of stress.”
Wierema said with the emerald ash borer beetle when the signs of stress appear, there is little to be done to help the tree. With the twolined chestnut borer, trimming, watering, and the help of a certified arborist.
Please contact your sales rep for more information.
PHC for Trees SRN 11-22-22 SRN
PHC for Trees SRN 11-22-22 is a fully soluble product that provides both chemical and biological fertility. Its chemically based elements address trees immediate nutritional needs, while its beneficial bacteria will help to sustain fertility over the long term. Recommended for fall applications.
Packaging:
- 8 Pound Bag— Item#229190
DYLOX 6.2
Dylox 6.2 is a granular insecticide that contains the active ingredient Trichlorfon. It works by both contact and ingestion to treat White Grubs, Sod Webworms, and other turfgrass damaging pests.
Packaging:
- 30 Pound Bag— Item#470035
Contact your Conserv FS Turf specialist for more information.
“Two sounds of autumn are unmistakable…the hurrying rustle of crisp leaves blown along the street…by a gusty wind, and the gabble of a flock of migrating geese.”
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