. Fig. 6. â Clustercups of rust enlarged. After Clinton. dery. It is most common in the ovaries and other floral parts of the cereals. Rust should properly be applied only to cases where the special rust fungi (Uredinales) are present. Rusts usually show the spores in sori. Yellowing of leaves, due to diminution in green coloring matter, is a common symptom of disease. Chlorosis is a lack of proper green, a whitening of tissues which should be normally green. Canker consists of a roughening or splitting of the bark.

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Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1910, bookyear1910