. Fig. 12.—Iris rust. forms numerous, small seedlike bodies or sclerotia (fig. 11) on the sur- face of the affected plants. 8. Rolfsii also attacks sugar beets and many other hosts. Affected rhizomes should be dug out and destroyed. The remaining ones should be thinned and replanted, if possible in a new place. Rust.—Powdery pustules of reddish-brown spores of a rust fungus, Puccinia iridis, may appear on the leaves (fig. 12), which may be killed prematurely if the infection is severe. Most of the commonest species and varieties of iris are fortunately immune to this disease. When the tops are
. Fig. 12.—Iris rust. forms numerous, small seedlike bodies or sclerotia (fig. 11) on the sur- face of the affected plants. 8. Rolfsii also attacks sugar beets and many other hosts. Affected rhizomes should be dug out and destroyed. The remaining ones should be thinned and replanted, if possible in a new place. Rust.—Powdery pustules of reddish-brown spores of a rust fungus, Puccinia iridis, may appear on the leaves (fig. 12), which may be killed prematurely if the infection is severe. Most of the commonest species and varieties of iris are fortunately immune to this disease. When the tops are cut back, all diseased leaves should be carefully collected and burned. Soft Rot.—When the rhizomes have become thickly matted or are in heavy, poorly drained soil, a soft, slimy, bacterial rot, caused by Erwinia
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Keywords: ., bo, bookcentury1900, booksubjectflowers, booksubjectplantdiseases
