Karen- This is from a posting of mine last month:
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I once saw, at a commercial banana growing operation, all of the fruiting stems were enclosed in blue translucent plastic bags. When I asked some of th locals what that was for, I was told that it was to prevent scarring of the fruit from the edges of the leaves, whipping around in the wind. If this is the case, does anyone know why the bags were always blue?
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I got no reply at that time, but maybe someone seeing this knows the answer.