Many of my container plants have one or two fruit with BER. This includes a few cross-pollinated fruit; since BER tends to affect early-forming fruit, it's not surprising it is a problem with some of my early cross attempts. Bummer though. Historically I have not had enough BER to really be a problem. Although the conventional wisdom all says it's a calcium transport problem, there is really nothing much to be done about it. Apparently it's increased by both over- and under-watering, and over- and under-fertilizing. ! Good luck figuring that one out. Calcium sprays are widely recommend for use on the foliage, but it's not clear that this really does any good. Also, supplementing calcium in the soil may not help much because the problem is not necessarily lack of Ca in the soil.
The problem is supposedly caused by excess transpiration through leaves, which diverts calcium away from the developing fruit. This may explain why excess nitrogen is bad, because this stimulates foliage development. Actually my container plants are kicking ass in terms of foliage, but the fruit set is actually not that amazing. This all seems related to excess fertilizer/nitrogen.
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