Depends on how warm the spring is but late April- May if mild May -June in a "normal " year if there's such a thing these days. Coding moths , & winter moths are entirely different. Winter moth females are wingless so they crawl up the trunk that is how the grease bands work.
I melted some vaseline and soaked a j-cloth in it, and wrapped it around the trunk - will that work to stop ants climbing up and farming cherry blackflies?
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Thanks to all for your help and info :-)
Joan
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.