Answer: It sounds like you should have had great melons. I think vine borers got in your vines. You can find them by looking for a holes in the vines with a tiny sawdust looking mass. They can be extracted by carefully slitting the vines with a razor and pulling out the grubs. They can be prevented by regularly checking the vines, covering the young vines with a floating row cover until flowering, or spraying with Bt, a safe biological insecticide, when you begin to see damage.
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