File:Journal of agricultural research (1919) (14587985489).jpg

Identifier: journalofagricul17unit (find matches)
Title: Journal of agricultural research
Year: 1913 (1910s)
Authors: United States. Dept. of Agriculture Association of American Agricultural Colleges and Experiment Stations Association of Land-Grant Colleges and Universities Association of Land-Grant Colleges
Subjects: Agriculture -- United States
Publisher: Washington, U.S. Govt. Printing Office
Contributing Library: The LuEsther T Mertz Library, the New York Botanical Garden
Digitizing Sponsor: The LuEsther T Mertz Library, the New York Botanical Garden

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cing aphids. This method resultedin 89 per cent of infection before the plants matiued. In practice the insect cagewas left in place while the aphid-bearing leaves on the stick were introduced. Green-house, Orono, Me., April, 1919. PLATE 27 A.— Leaves from graft shown in B, of this plate: At right, from healthy parent ofscion; at left, from mosaic stock; in center, from mosaic scion. B.—At left, healthy scion grafted to diseased stock, Green Mountain variety; atright, two mosaic shoots of stock. Grafted July 6, 1918. Scion decidedly mottledAugust 17, 1918. In field, Presque Isle, Me., 1918. C.—Leaves from corresponding parts of the plants shown in Plate 29, B. Theseleaves were near the tops of the plants and matured long after all aphids had beenremoved. The characteristic mottling was obscured by the use of reflected light,but the contrast in the evenness of the leaf surfaces is evident. Greenhouse,Orono, Me., 1919. Investigations on Mosaic Disease of tlie Irish Potato Plate 27
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