That's a tough one. You can try it two ways. First, you can grow the squash under grow cloth (you can buy at Gardener's Supply online). This will keep the bugs from getting to your squash, but you'll have to pollinate your plants yourself with an artist's paint brush since no insects will be able to reach your plants. Or, you can apply an organic pesticide such as Spinosad on your plants following label directions. Spinosad is available under a number of different brand names. One I know of is called Captain Jack's DeadBug Brew. You should be able to find it at Home Depot, Lowe's or Wal-Mart or even a local garden center. But, Spinosad, the formula should work, no matter what the brand is called. Read the labels to find it."