Hi Priscilla, I don't do much with trees, but this past Feb. I attended a seminar having to do with malicious pruning and storm damage.  It was given by an assistant professor of Ohio Sate.  His name is Erik Draper and he was pretty good.... The semiar materials are available online if you go to the negrows.org web site and click on the attendee link then educational program.  Scroll down until you see the course; How to turn malicious pruning into magnificent pruning.  There is a link there to a PDF.  It's really big, so be patient as you download it; lots of pics I think.  You might be able to find some help there.  Hope it goes well....

dear all, a bit more information if that helps! the greenhouse is attached to my wood heated home. so is heated. I found one leaf with circular spots on it. I have a photo if this site allows uploaded photos. thanks robin

I have just joined this forum hoping for some advice about a problem with my young tomato plants. (In a greenhouse in southern BC) Leaves are starting to get beige to translucent marks on the edges and tips. The marks are not circular and so far only on the edges.