Arborvitae 'Emerald Green' and Bag Worm
I have recently planted 90+ Arborvitae trees. I understand they are succeptible to bag worm. I don't see
any bags on them now however I understand they should be sprayed. Could you advise when they should be sprayed and with what chemical? Also, how often should they be sprayed?
Thanks very much in advance for your help.