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
This article tells about their life cycle and should help you decide:
https://www.gardeningknowhow.com/plant-problems/pests/insects/treatment-bagworms.htm
We planted 2 Blue Spruce trees 2 years ago and they had been looking great. 2 weeks ago when we had a cold snap and snow here in Denver metro. Today we noticed that the needles are turning brown. See enclosed pics. We have a drip line that waters these trees. We did turn the water off during our freezing weather but then turned it back on once our weather warmed up. Any help would be so appreciated! Thank you!
Unfortunately, it may be suffering from overly wet soils. Soil that does not have a chance to dry out will not allow for root gas and nutrient exchange. Fungicides, and a thorough dry out between waterings can help.
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm
Your local extension service may be able to offer advice, and test soils if you are not able to do so.
https://www.gardeningknowhow.com/extension-search
This article will help you to care for the tree:
https://www.gardeningknowhow.com/ornamental/trees/colorado-blue-spruce/care-for-colorado-spruce.htm
We have a blue spruce in our back yard and wonder if it is prone to falling over in high winds like other evergreens.
I did some research and I saw that most evergreens can be susceptible because their branches collect and hold rainwater or snow making them heavy and prone to topple in high wind. Some evergreens were worse than others and blue spruce was not on the "worst" list.