. Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases. ;i9 cutting and burning, injures the asparagus. Ordinary bor- deaux mixtures have been tried but with Httle success. Resin bordeaux is recommended by the New York Agricultural Ex- periment Station where the rust has been successfully treated with this mixture. The application with ordinary barrel pumps is too laborious and slow, so that it was found necessary to de- vise a special sprayer, the plans and description of which are published in the bulletins of that station. (See N. Y. Ex. Sta. Bull. No. 188.) Sulphur has very r
. Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases. ;i9 cutting and burning, injures the asparagus. Ordinary bor- deaux mixtures have been tried but with Httle success. Resin bordeaux is recommended by the New York Agricultural Ex- periment Station where the rust has been successfully treated with this mixture. The application with ordinary barrel pumps is too laborious and slow, so that it was found necessary to de- vise a special sprayer, the plans and description of which are published in the bulletins of that station. (See N. Y. Ex. Sta. Bull. No. 188.) Sulphur has very recently been shown to be quite successful in keeping down the disease in California. Bean rust [Uromyces appendiculatus (P.) Link.]. This is not usually one of the most serious of bean diseases, but may in some localities become a dan- gerous pest. It attacks chief- ly the common garden bean, but has also been reported on other beans. All three spore forms occur on the same host plant. The cluster-cups are yellowish and appear in the late spring. The summer and winter spores appear later in small pustules, about the size of a pinhead. These pustules are light- to dark-red-brown and appear chiefly on the leaf- blades but can also be found on the petioles, stems and even on the pods. The pus- tules are circular in outline and the spore masses of summer and winter spores are powdery. The winter-spore pustules are dark-brown and may finally be- come blackish in color. The winter spores are single-celled and germinate in the usual method for rust winter spores. Certain varieties of bean resist the rust and such should be planted. Infected plants should be destroyed by burning. Bordeaux mixture has also been suggested as a means of hold- ing the disease in check, but is not in general Fio. 162.—Rust of bean. Winter spore clus- ters on the lower surface of a bean leaf. After Please note that these images are extracted from scanned page images that may have been digit
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