Bob,
May I save you some time? Re your post (below), you need green leaves
to get the insecticide inside the plant. If the roots are growing and the
insecticide molecules small enough, the plant maybe/might/possibly up-take
that way otherwise you'd have to soak the roots a l-o-n-g time to get at the
borers.
How long have you been a member? Do you read the Pomona? I wrote an
article about controlling cane borer just a few Pomonas ago. Controlling
crown borers should be similar and you don't have to dig up the plants.
Hi Mark,
No answers from Nafex...
I have read about the critters and it looks like the only way to get rid of
them is to drench the crowns with insecticide.
I don't really want to do that and so will dig all the roots up early in the
spring and do an insecticidal soak in some buckets before transplanting them
to a new place.
If you can remember in the fall, I'll know for sure if it worked.
bob
[NAFEX] Controlling Crown Borers,
Jim Fruth, 01/24/2008