Most people on a large scale use calcium nitrate, in drip (mostly as a feed, not only when ber occurs). Of course, drip itself is basically anti-ber, but when it's really hot there can still be problems.
There are many products for spraying in Europe. From them, Myr-calcium seems in theory as a good one, it's calcium complex-ed with aminoacids and it's a modern product. I have not used it, it's quite expensive.
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