Locate hole in stem where the borer entered. Split stem lengthwise above the hole and kill the borer. Bind the split stem and keep the plant well watered. Spray to prevent further infestations. They suck juices from the plant and cause hard, whitish spots just under the skin of the fruit.
Sprays are effective.
Sprays during June will help control this insect. Make several applications. Forceful water sprays, insecticidal soaps or chemical sprays may be used for control. Leaves infested with spider mites will become pale as shown here. Lower leaves on tomato plants attacked by early blight will spot and turn yellow.