An uneven moisture supply makes the problem worse. The problem is often accompanied by vigorous growth and excessive nitrogen applications. The leaf margins roll upward following heavy rains or excessive soil moisture. Possible causes are low soil moisture during periods of hot dry winds, excess nitrogen, sudden cool weather, and beating rains. Fruits crack when periods of warm weather and rain follow dry weather.
Distorted growth is usually due to injury from lawn weed killers.
The source may be drift or it can be on grass clippings used as mulch. Catface is distorted fruit with puckering and cavities at the blossom end. Possible causes are injury to the flower from heat, drought, low temperatures, or herbicides. Sunscald occurs when green tomatoes are exposed to direct sun. Light colored spots develop followed by blistering and invasion of the spot by secondary rots.