here is an example of blossom drop that folks sometimes mistake for blossom end rot. this is basically a weather related issue and does hurt the plant nor is their any corrective action needed except time needed for the weather to cool down a bit. these are heirloom beefsteaks that are planted in partial shade and even though no diseases present and the vines are full of tomatoes, this is a pollination problem due to heat and humidity. heirlooms are more susceptible to some of the other hybrid varieties. it also happens to other garden vegetables as well.
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