Bacterial Wilt (Cucumbers) Description: Large vines gradually wilt and die (no yellowing of leaves); young plants die rapidly. Bacterial wilt is spread by cucumber beetles. Solution: Remove and destroy wilted plants. To prevent, use PyolaTM Insecticidal Spray; start applications as soon as plants are above ground, at 5 to 7 day intervals, or as necessary to control cucumber beetles. Or grow vines under Super-Light Insect Barriers; remove covers for pollination; resume spraying while cover is off.