Tomatoes rotting after harvest
I grow my tomatoes under cover but not enclosed, and water the plants at ground level only. After a fairly good harvest this year, with the tomatoes nested in newspaper-lined baskets as we always do it, more than half of the fruit have rotted; they developed soft brownish zones and a mold or fungus spread among them. This has never happened to me before. Several of the varieties were new to me, from seed obtained by exchange, but the problem was not limited to those new ones. Many of the larger fruit had circular shallow cracking around the top at harvest but seemed otherwise healthy.
I wonder what caused this problem, whether I can plant in the same bed next year and whether I can use seed from fruit that seemed unaffected although it was mixed in with the others.