Disease wheat is a type of wheat that is affected by various diseases, such as rust, smut, and mildew. The term is used to refer to the six different types of wheat: SHEAF (5 letters), CROP (4 letters), BRAN (4 letters), AWN (3 letters), durum (5 letters), and THRESH (6 letters). SHEAF is a type of wheat that is harvested in its entirety, while CROP is a type of wheat that is harvested in its immature state. BRAN is the outer layer of the wheat grain, and AWN is the long, thin, and pointed part of the wheat grain. Durum is a type of wheat that is used to make pasta, and THRESH is the process of separating the wheat grain from its husk. Finally, spelt (5 letters) is a type of wheat that is similar to durum, but has a higher protein content.