Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 118 DISEASES OF ECONOMIC PLANTS The results are shown in the accompanying figures. The trees, located in Illinois, were sprayed May 20, June 20, and July 17, the first spraying being about a month after blooming, the second just after picking. Fig. 52. •Brown rot (sclerotiniose) showing various stages of decay. After Clinton. Rust. See peach. Black knot (Plowrightia morbosa (Schw.) Sacc). — As upon the plum, this knot causes serious injury to the cherry. In some sections it has spread to the w
Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 118 DISEASES OF ECONOMIC PLANTS The results are shown in the accompanying figures. The trees, located in Illinois, were sprayed May 20, June 20, and July 17, the first spraying being about a month after blooming, the second just after picking. Fig. 52. •Brown rot (sclerotiniose) showing various stages of decay. After Clinton. Rust. See peach. Black knot (Plowrightia morbosa (Schw.) Sacc). — As upon the plum, this knot causes serious injury to the cherry. In some sections it has spread to the wild cherry and plum trees in such abundance as to render control prac- tically impossible, and in this way it has killed the cherry- growing industry. Taken in time it is easy to control. See plum.
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