Russell H. Larson

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Virus A is one of several viruses which incite mosaic diseases in the cultivated potato, Solanum tuberosum L. In susceptible varieties, virus A alone incites only a very mild mottle or is carried without production of symptoms. However, in combination with the milder mottle strains of virus X, it incites a moderate to severe mosaic disease, which in the(More)
D. D. BURKE, P r e s i d e n t . . . . . . . . . . . Pennsylvania State College, State College, Pa. H . A . R~TT.~x, I~ice-President . . Michigan Potato Growers ' Exchange , Cadillac, Mich. 0RA SMITH, S e c r e t a r y . . . . . . . . . . . . . . . . . . . . . . . . . Cornell Univers i ty , Ithaca, N. Y. JOHN C. CAMPBelL, T r e a s u r e r . . . . . . . .(More)
response of the plant to relative length of day and night. Jour. Agr. Res. 23 : 871-92o. 6. Jones, L. R. I899. Certain potato diseases and their remedies. Vt. Agr. Exp. Sta. Bul. 72: 3-32. 7. Kfihn, J. z88o. Bericht fiber Versuche zur Priifung des Giilichschen Verfahrens beim Anbau der Kartoffeln. Bericht aus dem phys. Lab. u. Versuchsanst. Landwirtschaft.(More)
Interveinal mosaic, a virus disease of the Irish Cobbler potato variety, was described by Schultz and Folsom in 1923 (10), Schultz in 1951 (9) , and MacLachlan, Larson, and Walker in 1954 (6). The present studies have revealed the presence of potato "viruses S and X in all Irish Cobbler material used, whether "healthy" or affecte-I with "interveinal(More)
Results of these studies of isolates of the potato leaf roll virus from 56 various seed potato areas of the United States and Canada, covering a wide geographical range, substantiate the existence of distinct strains of the virus. In addition to the 3 strains from Wisconsin previously reported, one additional very severe strain, designated as strain 4,(More)
In view of the fact that greater emphasis is now being placed upon the control of potato scab, Actinomyces scabies (Thax ) . Guss6w through disease resistance, a field study of standard varieties was initiated in 1935 . The ultimate purpose of this series of tests was to secure more accurate information regarding the relative susceptibility of varieties in(More)
The common occurrence of a severe mosaic disease, due to infection by a ringspot type of potato virus X, in certified and foundation seed fields of Chippewa, Sebago, Pontiac, Red Warba and Katahdin under Wisconsin conditions does not seem to be adequately explained on the basis of direct foliage (3.4,8) and root (6.7) contact transmission alone. Since the(More)