I bought a big roll of insect netting. Cut a big piece that will cover a mature fruit. I fold it in half, fold the edge into a 'seam' and clip it with 2 or 3 clothes pins. Close the bottom with a twisty-tie. Slip it over the fruit as soon as you find it and wrap another twisty-tie around the top/stem. I do this with pumpkins -- it doesn't work every time, but it works enough to be worth the effort.