. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 2221. Colonies of Rust on the stem of wheat. 2222. The cluster - cup stag e of the wheat Rust fun- gus growing on a barberry leaf. forms, delimited by differences in the marked capacity of the uredo- or teleutospores to inociilate on different hosts. Several rusts are common on cultivated plants, causing diseas
. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 2221. Colonies of Rust on the stem of wheat. 2222. The cluster - cup stag e of the wheat Rust fun- gus growing on a barberry leaf. forms, delimited by differences in the marked capacity of the uredo- or teleutospores to inociilate on different hosts. Several rusts are common on cultivated plants, causing disease; viz., beet rust ( Cfromyces Pe^'o'), broad bean rust [Uromyces Fahce), white pine rust [Cron- artium ribicolum), asparagus rust {Puccinia Asparagi), chrysanthemum rust {Puccinia SCieracii), black, or wheat rust {Puccinia graminis), hollyhock rust {Puc- cinia malvacearum), etc. John W. Harshberger. The rusts are fungi constituting a very large and economically important class known as XJredineae. They are all obligatory parasites, attacking a vast num- ber of native and cultivated plants. The mycelium of. 2223. Ruta graveolens. Flowers shghtly enlarged. the rust fungi exists entirely within the tissues of the host. The spores are formed in masses or sori just be- neath the epidermis. When ripe they break through the epidermis, forming brown patches and spots from which they are scattered. Many of the rusts produce several spore-forms, which often occur in regular succes- sion either on the same host or on different hosts. For example, the wheat rust produces uredospores and teleu- tospores on the wheat and aecidiospores on the barberry. Rusts rarely kill the plants which they affect, and hence in many cases the damage done is not as appar- ent as in many other diseases. In all cases, however, the plants are weakened, and often much disfigured. Thej^ are among the most difficult fungous diseases to combat. Spraying has been tried in many instances, but has proved, at most, onl
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