File:Annual report of the Secretary of the State Board of Agriculture of the State of Michigan .. (1862-) (19179330048).jpg

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Title: Annual report of the Secretary of the State Board of Agriculture of the State of Michigan ..
Identifier: annualreportofse62mich (find matches)
Year: 1862- (1860s)
Authors: Michigan. State Board of Agriculture; Michigan State College. Agricultural Experiment Station
Subjects: Agriculture -- Michigan
Publisher: Lansing : The Board
Contributing Library: New York Botanical Garden, LuEsther T. Mertz Library
Digitizing Sponsor: The LuEsther T Mertz Library, the New York Botanical Garden

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EXPERIMENT STATION BULLETINS. 441 Potato Leaf-Roll The study of material from potato plants affected with leaf-roll has been carried out in the same way as for bean and tomato mosaic. The plants were first carefully exammed to exclude if possible any that might also be affected with mosaic. The plants used for this study were taken from a small patch of potatoes where no mosaic was found. They showed unmistakable symp- toms of leaf-roll, the lower leaves being uprolled, rigid, brittle, and much thickened, while the entire plant was stunted in growth. Pieces of stem and
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Fia. 16. Photomicrograph of a protozoan coiled around a sieve tube nucleus in a potato plant affected with leaf-roll. X 1500. A. Trypanosome. B. Nucleus. C. Sieve tube. D. Elongated protozoan partially out of focus. petiole from near the top of the plant were cut and fixed. Some difficulty was experienced in cutting good sections with phloem and xylem tissue intact. Lying in the sieve tubes of petioles and stems, long, trypanosome-like organisms were found which stained in much the same maimer as the bean and tomato organisms. They vary as much as do the types found in tomato mo- saic plants, but are, nevertheless, characteristic and constant for this disease. On account of their distribution in the plant and the tendency to distribute themselves along only certain of the sieve tubes they are not always found

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