Due to extensive disruption of conducting tissues, plants often wilt and die. The presence of holes in plant stems, and an accompanying ooze, signal the presence of squash vine borers. Large white worms with brown heads can be seen if stems are cut open. Squash vine borer populations vary from location to location, thus being of a major concern in some areas but inconsequential in others. Insecticidal controls must be implemented before larvae bore into plants.
Preventive treatments are best.
Start to apply insecticides when the vines begin to run. Continue on a 7 to 10 day reapplication schedule for 3 to 5 weeks. If plants wilt, look for the presence of holes and ooze. If found, the stem can be slit and the borer removed and destroyed. If the plant is not dead, cover the damaged area with soil and keep the plant moist.