Bag Worms – Infected Last Year – Picked Off Last Winter- None Seen This Year – Still Spray Trees This Yr?

Question

As stated above I had a few of my dozen blue spruce infected last year. I hand picked them off last winter and do not see any bags this June. Should I still spray for them this year? I’ve lost 2 spruces over 25 years old. Very sad to see them rot away. Thank you… David

Answer 1

This article tells about their life cycle and should help you decide:

https://www.gardeningknowhow.com/plant-problems/pests/insects/treatment-bagworms.htm