. Fig. 90.—Piicciniapruni. i, portion of diseased plum leaf; 2, teleutospore ; 3, paraphysis ; 4, lower cell and portion of pedicel of a teleutospore, from which the upper cell has broken away ; 5, uredospore. Fig. i reduced, remainder highly mag. nature of the various kinds of reproductive bodies produced by this species has existed until recently, when the matter has been thoroughly worked out and put right by Professor M'Alpine. Uredospores varying from almost globose to piriform, smooth, apex conspicuously thickened, 18-36 X 14-18^1; para- physes numerous. Teleutospores formed of two almos
. Fig. 90.—Piicciniapruni. i, portion of diseased plum leaf; 2, teleutospore ; 3, paraphysis ; 4, lower cell and portion of pedicel of a teleutospore, from which the upper cell has broken away ; 5, uredospore. Fig. i reduced, remainder highly mag. nature of the various kinds of reproductive bodies produced by this species has existed until recently, when the matter has been thoroughly worked out and put right by Professor M'Alpine. Uredospores varying from almost globose to piriform, smooth, apex conspicuously thickened, 18-36 X 14-18^1; para- physes numerous. Teleutospores formed of two almost globose, superposed cells, the uppermost largest, brown, warted, pedicel hyaline, elongated; paraphyses numerous. Spray with dilute Bordeaux mixture at intervals, begin- ning when the leaves are expanding. It is certain that the first infection in spring is due to the presence of teleutospores, hence all fallen diseased leaves should be dug in, or collected and burned. M'Alpine, Atm. Mycoi., 2, p. i (1904). Puccinia iridis (D. C.) is found on the leaves of many species of iris. The uredospores form crowded pustules. Spores elliptical or ovoid, rough, ochraceous, 20-35 X 16-26 [i. The teleutospores form long stripes, blackish, spores two- celled, clavate, constricted at the septum, apex thickened, 30-35 X 14-22 \i. No aecidium. Puccinia gentianae (Strauss) attacks various species of cultivated gentian. The lower leaves are first attacked and
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Keywords: ., bookpublishernewyorkmacmillan, booksubjectplantdis, bookyear1910
