Answer: Insofar as tomato graywall is caused by environmental factors, usually in combination: low temperatures, excessively wet soil and low light levels especially if vines are very thick. Since you can't control the weather, your best bet would probably be to improve the cultural conditions as best you can. You might consider waiting until the weather and soil are truly warmed before planting your tomatoes, work to improve soil drainage by building raised beds and adding organic matter to improve its structure, and perhaps pruning overly dense vines. Finally, your local County Extension (736-3394) should be able to help you select varieties which tend to perform best in your local area. Good luck with your tomatoes!
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