here are links to images and explanations of frost damage on blueberries; http://www.canr.msu.edu/vanburen/bbfrzed.htm and on strawberries: http://www.omafra.gov.on.ca/english/crops/facts/frosprot_straw.htm#symp and on apples: http://www.vegedge.umn.edu/mnfruit&vegnews/Vol2/516frost.htm <http://www.vegedge.umn.edu/mnfruit&vegnews/Vol2/516frost.htm> I hope you don't need these. Vern