Fall Cankerworm Aerial Treatment Program


Urban foresters have detected high populations of cankerworms in Mason, Lee and Mount Vernon districts. To minimize tree mortality, the Fairfax County Forest Pest Management Branch has developed a voluntary suppression program to take place in late April. This year the county will treat approximately 2,200 acres. Using helicopters, experienced pilots will spray the canopy of trees with the most environmentally sound insecticide available, Bacillus thuringensis (Bt.). Once the cankerworm caterpillar ingests the Bt. they stop feeding and die within a week.

Written notification will be mailed to all property owners within the treatment areas and within close proximity of any treatment. Participation in this program is voluntary. If you receive written notification that your property is located within a treatment area and you wish not to participate, you must notify, in writing, the Forest Pest Management Branch at 12055 Government Center Parkway, Suite 518, Fairfax, VA 22035. Your letter must be postmarked no later than April 11, 2014.

2014 Treatment Areas



Spray Block Date Completed Time Completed
1 5/1/2014 11:47 a.m.
2 5/1/2014 12:37 p.m.
3 5/1/2014 1:08 p.m.
4 5/1/2014 11:22 a.m.
5 4/28/2014 7:42 a.m.
6 4/28/2014 7:58 a.m.
7 4/28/2014 10:57 a.m.
8 4/28/2014 10:25 a.m.
9 4/28/2014 10:37 a.m.
10 4/28/2014 10:47 a.m.
11 4/28/2014 6:50 a.m.
12 4/28/2014 6:19 a.m.
13 4/28/2014 7:08 a.m.
14 4/28/2014 9:39 a.m.
15 4/28/2014 9:29 a.m.
16 4/28/2014 9:52 a.m.

For further information, contact the Fairfax County Forest Pest Management Branch at 703-324-5304, TTY 711, or via email.


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