Question
My 5 year old gingko leafed out fine but in the last week all the leaves curled in from the long end towards the stem end " like fingers curl into a fist." It has not dropped any leaves and are yellow green.

Answer
Hi Phyllis, Your gingko has some sort of bug sucking on the leaves making it curl and turning it green.  You can use 100% pure Neem Oil spray by Dyna Grow or Atomic Grow to make your tree healthy and keep the critters away.  Both are organic.  Or you can use an insecticidal spray which may contain poison so please read your labels.  kathy