Blossom-end rot of tomatoes and peppers . Occurs when soil becomes very dry. Proper irrigation usually prevents it. Some varieties are more susceptible than others. Often a result of using old, large or overly-hardened transplants.
Same principle applies to other transplanted crops, with some variations.
Cucumber plants suddenly start wilting , leaves may show dead areas and fruit may be mottled. Likely cucumber mosaic virus, a common disease problem in New York State. Select mosaic-resistant varieties. Sudden rise in temperature or depleted soil moisture can cause wilting, too, but plants will recover. Poor or slow germination of seed.