Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] UROMYCES 293 Haricot bean rust.—Haricot beans or 'scarlet-runners' are often attacked by Uromyces appendiculatus (Link.) causing the leaves to fall early, when the development of pods is checked. Aecidia, uredo, and teleutospore stages all follow in succession, forming numerous minute brown pustules on the leaves. Aecidiospores angularly globose, whitish, slightly punctulate, 17-32 X 14-20/x. Uredospores pale brown, aculeolate, 24-33X 16-20 /. Teleutospores elliptical or subglob
Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] UROMYCES 293 Haricot bean rust.—Haricot beans or 'scarlet-runners' are often attacked by Uromyces appendiculatus (Link.) causing the leaves to fall early, when the development of pods is checked. Aecidia, uredo, and teleutospore stages all follow in succession, forming numerous minute brown pustules on the leaves. Aecidiospores angularly globose, whitish, slightly punctulate, 17-32 X 14-20/x. Uredospores pale brown, aculeolate, 24-33X 16-20 /. Teleutospores elliptical or subglobose, smooth, Fig. 85. — Uromyces coh/iui. i, portion of a diseased Colchicum leaf; 2, teleutospores, one of vvhicli has germinated and produced a promycelium bearing three secondary spores. Fig. i reduced, Fig. 2 mag. dark brown, apex much thickened, with a small, hyaline, wart- like papilla, 26-35 X 20-26 /x. If the disease appears early, spray with Bordeaux mixture ; when the pods are formed, use permanganate of potash. Broad bean rust {Uromyces fabae, De Bary) is a parasite very common on the leaves and stems of broad beans, peas, also on various wild leguminous plants, vetches, etc. The aecidium stage appears in the spring; the cluster-cups are grouped on conspicuous, thickened, whitish spots on the stem and leaves. The uredo stage follows as minute brown pustules, usually scattered thickly over the under surface of
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