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Market Diseases of Apples, Pears, and Quinces
Drought Spot

The name "drought spot" came into use in 1916 when A.J. Mix described it along with cork, a disease that had been known for many years. The two diseases were considered to have similar causes. Cork is now generally ascribed to a lack of boron. Boron deficiency is also regarded as the cause or one of the principal causes of certain other symptoms previously identified as drought spot or heat injury. Now that some of the underlying causes of these disorders are better known, and since there appears to be no accurate description of drought spot that sets it apart from cork and heat injury, it seems best to discontinue the use of the name.