Bagworms

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coolbrze

ArboristSite Operative
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There are bagworms infesting some Emerald Green Arborvitaes. What's a good product to spray them with & when should you spray in VA (Zone 7)? Thanks!
 
They aren't out yet, so put them on the schedule. I plan on late June/early July in northern Ohio. Don't look at a calendar though...look at plants. Bagworms will hatch soon after Japanese Tree Lilac starts to bloom. Get ready then and do the spray when it reaches full bloom.

I used spinosad (Conserve) with good results. The common recommendation is Bacillus thuringiensis (Bt) which is very effective against early instars. It doesn't have as long of a control window as spinosad and costs a little more...but is very specific to lepidoptera. If you wait until later in the year you will need something a little stronger like bifenthrin...but don't wait that long.

They are extremely easy to kill if you get the timing right, and almost impossible if you get the timing wrong.
 

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