California Agriculture, May 1950
Volume 4, Number 5
Insect vectors of cantaloupe mosaic
Fruit size and leaf composition: Concentration of potassium in orange leaves found to be associated with fruit sizes
by E. R. Parker, Winston W. Jones
Not available – first paragraph follows: Evidence of the effect of potassium-supplying fertilizers on citrus fruit size in the long-term experimental orchard at Riverside was obtained by determining the concentrations of this and other elements in the leaves.
New sugar beet pest: 100% control of sugar beet crown borer achieved in 1949 tests
by W. Harry Lange
Not available – first paragraph follows: The sugar beet crown borer—Hulstia undulatella—a relatively unknown lepi-dopterous pest of sugar beets caused severe damage to seedling and half-grown sugar beets in Yolo, Yuba, and Solano counties during 1949. Although it probably causes some damage annually it apparently has not been reported in the scientific literature as a California pest since 1905 when damage was reported at Chino, Huntington Beach, Oxnard, Spreckels, and in the Santa Ana Valley.
Wax sprays for sweet cherries: Fail to increase size of fruit in experimental tests in Davis in 1946 and in San Joaquin County in 1949
by Reid M. Brooks, L. L. Claypool
Not available – first paragraph follows: Wax sprays applied to trees of the sweet cherry varieties Black Tartarian, Lambert, and Bing did not increase the size of the individual fruits, in experimental work at Davis in 1946 and in San Joaquin County in 1949.
Walnut aphid control: Aphicide in May codling moth spray effective in northern California
by W. W. Middlekauff, A. E. Michelbacher
Not available – first paragraph follows: Natural enemies of the walnut aphid-one of the most destructive insects attacking walnuts in northern California—serve to keep the aphid population in check.
Alfalfa caterpillar control: Treatment of fields by airplane application of spray advances destruction of pest
by Clarence G. Thompson, Edward A. Steinhaus
Not available – first paragraph follows: Populations of the alfalfa caterpillar can be reduced successfully by airplane application of the polyhedra virus, spreading an epidemic of wilt disease— polyhedrosis—among the pest.
Cantaloupe mosaic insect vectors of virus disease resist insecticides in field tests
by R. C. Dickson, J. E. Swift, L. D. Anderson, John T. Middleton
Not available – first paragraph follows: Cantaloupe mosaic—a virus disease-has cut the production of early-summer melons in the desert valleys of southern California, particularly in the Imperial Valley.
Tomato spacing: Close spacing increased early yields in 1946–1949 experiments
by D. M. Holmberg, P. A. Minges, M. P. Zobel
Not available – first paragraph follows: Plant spacing trials for canning tomatoes were initiated in Yolo County in 1946. Since the introduction of the field seeded method plant spacing has become of special interest to tomato growers. In this method, the cost of establishing the field is the same regardless of the spacing, while in transplanted fields the cost will increase with closer spacings.
Tomato insect studies: DDD and DDT in three-year tests with chlorinated hydrocarbons
by A. E. Michelbacher, W. W. Middlekauff, N. B. Akesson
Not available – first paragraph follows: Excellent control of tomato insects with DDT and DDD was achieved during the three-year period, 1946-1949. DDT and DDD were used safely on canning tomatoes and, when properly applied, gave excellent control without creating an objectionable residue problem.
Harvesting asparagus: Comparative effects on yield of cutting and of snapping studied
by G. C. Hanna
Not available – first paragraph follows: Under California conditions it is doubful whether a saving of labor by field snapping would offset the decrease in yield in the field, and the loss of usable asparagus by trimming in the cannery.
Housing lumber: Depends upon family income, cost of ownership, population growth
by Henry J. Vaux
Not available – first paragraph follows: Housing in California might well require more lumber annually in the next two decades than was used in the peak of the 1920's.
editorial, news, letters & science briefs
Dairy industry, 1949: Progress report of research conducted by members of the staff of the Division of Dairy Industry at Davis
by E. L. Jack
Lamb consumption: Varies according to population group and to size of family annual income
by Varden Fuller