Insects Identify and use control measures. Dry brown to black rot on blossom end of tomato Low soil calcium Add gypsum. Extremely dry soil Irrigate and mulch. Cool weather during blooming Plant at recommended time. Do not use sprayer previously used to apply 2,4-D. Virus disease Remove infected plants to prevent spreading.
Control insects that transmit.
Cracked tomatoes Drought followed by heavy watering or rain Keep plants mulched and watered.