Frederick J. Stevenson

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Analyses of the data from 24 progenies resulting from crossing and selfing 12 parental clones showed potato chip color to be highly heritable. Progenies with high mean chip color ratings resulted from parents with high chip color ratings. Similar results were obtained from populations of 144 or 48 individuals per progeny. Seedling varieties with high chip(More)
Most of the N in surface soils occurs in organic forms. The organic N in soil plays a key role in plant nutrition and soil fertility through its effects on microbial activity and nutrient availability. Typically, about one-third of the fertilizer N applied to temperate-zone soils is immobilized and retained in organic forms at the end of the growing season.(More)
The Katahdin potato is resistant to mild mosaic but not to spindle tuber or leaf roll. It is a high-yielding variety, producing tubers of excellent shape, with shallow eyes and desirable cooking quality. The vines mature late but the tubers apparently set rather early. Observations have indicated that it is probably well adapted to muck and peat soils. It(More)
Interactive health communication applications (IHCAs) may be particularly useful to patients and carers managing chronic disease. We have run eight focus groups with patients and two with carers involving a total of 40 participants. The focus groups were designed to seek patients' and carers' requirements of IHCAs and to identify the criteria they would use(More)
Saco (U.S.D.A. B 606-67) is a late-maturing high-yielding variety. The tubers of Saco are predominantly short and round with a tendency to produce off-types. After grading out the poorly shaped potatoes the net yield of marketable tubers is often higher than that produced by standard varieties. Saco, as grown in Maine, produces tubers as high in dry matter(More)
In recent years potato wilt caused by l/'erticillium albo-atrum Reinke & Berthold, has been receiving much attention in Maine. The causal fungus is soiland seed-borne and the practice followed by many growers, especially during the days of price control, of producing potatoes year after year on the same land has resulted in the soil sometimes becoming(More)
Wilt of potatoes incited by Verticitlium albo-atrum, Reinke and Berth. was first described in Germany (6) as early as 1879, and since then has been found in most of the temperate regions of the world. In North America, it has been reported from the northern states of Idaho (5) , Maine (3) , Oregon (4) , Wisconsin (7) , and from Canada (2) . The disease(More)
At the beginning of the article is an index of 7 pages. This is followed by an introductory section of 4 pages, which gives a brief review of the systematics of the tuber-bearing species of the genus Solanum. The second section covering 65 pages deals with cytology; the third section, dealing with genetics, involves 75 pages; the fourth section 12 pages in(More)
The Kennebec is a new variety of potato that combines high yield and good cooking quality with a high degree of resistance to late blight in both vines and tubers. In field-exposure tests it has not yet shown the symptoms of mild mosaic or net necrosis. It is late in maturing as grown in Maine, but has been considered medium-late in tests in other States.(More)
P U B L I S ! E E D BY THE POTATO ASSOCIATION OF AMERICA NEW BRUNSWICK. N. J. O F F I C E R S .~kN'D E X E C U T I X ' E C O M 3 I I T T ] E E F. J. S T E V E N S O N , P r e s ' i d e n ~ . . . . . . . . . . . . . . . . . . . . . . . . U. S. D . A., B e l t s v i l l e , Md. E. B. T U S S I N G , V i c e P r e s i d e n t . . . . . . . . . . Ohio S t a t e(More)