Adequate Calcium Prevents Squash Blossom-End Rot
Squash blossom-end rot is more a physiological disorder than a disease. When the fruit of the squash plant does not receive adequate calcium, the blossom end will develop a brownish-black dry rot spot. The soil is not necessarily deficient in calcium, but another factor may be hindering the calcium from reaching the developing fruit. Less crop yield is the end result.