I find the marketing names for bamboo to be confusing, but I am assuming this is Fargesia murieliae. This bamboo is hardy to about -20C, which means that is the temperature at which it will die if exposed for more than a day or two. Damage to the foliage and culms occurs above those temperatures, and the plants are even more vulnerable if they are in pots rather than in the ground. I think what you are seeing is carryover damage that wasn't immediately apparent after the cold snap. The issues with aphids, etc., did not cause this. They still look healthy to me despite the damaged leaves. Continue to treat them normally and well watered and you should see new leaf tips forming in several weeks. The main issue is what you will do to prevent this next winter. Are you able to bring them inside in a cold snap?

Hello Kudzu9,

Thank you for the reply. Yes, it is Fargesia murieliae, and you are you are right, better to call them with their proper names. I will follow you advice, and I hope to see their leaves revived. I will definitely bring them inside if next winter is as harsh (below -5), although they are big - it will be a challenge :). I will post a picture when they are hopefully looking a bit greener...Thanks again.

Good luck. You're going to lose a number of leaves, but keep on the lookout for new growth at the branch tips. Also, they could benefit from re-potting if they have been in those pots for a while and are getting rootbound.

Will do.. They were re-potted only last summer, the pots are quite big, so I was not really thinking about re-potting them yet, perhaps until next spring/summer... Thanks for all the advice.

You're correct. Since they were re-potted last summer that's nothing to worry about now.