I have a vigorous butternut squash vine that is on a trellis . Lots of squash have formed, some even get to a small size then the blossom rot sets in and I lose them. I have had at least 20 squash do this. I keep trying, hoping I may get a full healthy one. I have given it compost, vegetable food/calcium, water. . nothing works. Do I have to get rid of it and just try again next year?