coolbrze
ArboristSite Operative
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!
Bagworms
- Thread starter coolbrze
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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.
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.
Jason Douglas
ArboristSite Guru
Yeah, what he said. Low impact products work great when targeting early instars.
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