When you're growing an organic garden, learning about organic pest control is a must. Especially in the desert environment, we are teaming with life. Almost everywhere you look you could be dealing with vine borers. Instead of getting control of them after a few pumpkins and watermelons have wilted, prevent them to begin with.
Start with planting out your pumpkin field with radishes 2 months before you set seedlings. Borers will be ready to lay their eggs in the soil and they know radishes won't be on their larvae's food list.