California Agriculture, March 1959

Volume 13, Number 3
Walnut trees killed by delayed union failure

research articles

Hybrid cotton breeding program: Limited quantity of cotton hybrids produced for scientific use but seed production on commercial scale not yet possible
by John H. Turner
pp3, doi#10.3733/ca.v013n03p3
Abstract
Abstract Not Available – First paragraph follows: Numerous cotton hybrids–offspring of a cross between two individuals of dissimilar genetic constitution–have been produced in limited quantities for a plant breeding program at the Shafter Cotton Experiment Station.
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Stem borer found on safflower: Infestation discovered in planting at Davis may be first recorded attack on safflower by known pest of other plants
by K. E. Mueller , W. H. Lange
pp4-5, doi#10.3733/ca.v013n03p4
Abstract
Abstract Not Available – First paragraph follows: A fly stem borer–Melanagromyza virens (Loew)–of wide tastes, showed 100% infestation of late-planted experimentally grown safflower at Davis during 1958.
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Lime-induced chlorosis studied: Physiology of disorder investigated to learn role of malonic acid and possibility of a block in organic acid metabolism
by William A. Rhoads , Arthur Wallace , Evan M. Romney
pp6, doi#10.3733/ca.v013n03p6
Abstract
Abstract Not Available – First paragraph follows: Lime-induced chlorosis is an important–and widespread–nutritional disorder of plants in California and other western states. Trees and shrubs are especially susceptible on soils containing calcium carbonate–lime. Although the chlorosis responds variously to iron compounds, it appears to be more complicated than a simple iron deficiency because yellow, chlorotic leaves sometimes contain more iron than healthy green leaves.
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New disease resistant tomatoes: Improved strains of varieties Pearson and Red Top developed in plant breeding program at Davis and released to seedsmen
by O. S. Cannon , G. C. Hanna
pp7, doi#10.3733/ca.v013n03p7
Abstract
Abstract Not Available – First paragraph follows: Two new strains of Pearson tomato– Pearson VF6 and VF11– developed and released to the seedsmen are resistant to Fusarium and Verticillium wilts.
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Blackline in walnuts: Delayed failure of unions killing many walnut trees in central coastal counties
by E. F. Serr
pp8-9, doi#10.3733/ca.v013n03p8
Abstract
Abstract Not Available – First paragraph follows: Killing of a narrow strip of cambium and bark at the union of the Persian– Juglans regia–or English, walnut tree top and its rootstock is causing increasing losses of individual trees–even abandonment of entire mature orchards –in the walnut producing areas adjacent to San Francisco Bay.
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Walnut aphid investigations: Evaluation of new and old aphicides object of experiments conducted in northern California test plots in 1958 season
by A. E. Michelbacher , D. J. Burdick
pp10, doi#10.3733/ca.v013n03p10
Abstract
Abstract Not Available – First paragraph follows: OMPA was the most outstanding aphicide in studies at Linden, Walnut Creek and San Jose that included preliminary experiments with Phosdrin, Dicapton, Bayer 25141, Phosphamidon and Dibrom.
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Ponderosa pine planting stock: Studies indicate that time of lifting and length of storage before replanting influence survival of ponderosa seedlings
by Edward C. Stone , Gilbert H. Schubert
pp11-12, doi#10.3733/ca.v013n03p11
Abstract
Abstract Not Available – First paragraph follows: Cold storage of ponderosa pine seedlings–between nursery and field–is an integral part of the planting program in California. However, forestry agencies have been concerned for a number of years with the effect of storage on the subsequent survival of pine seedlings transplanted to the field.
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Ammonium bicarbonate toxicity: Root injury occurred from within few hours to several weeks in solution culture tests with citrus, avocado, and soybeans
by A. Wallace , M. I. Biely , K. C. Bhan
pp12, doi#10.3733/ca.v013n03p12
Abstract
Abstract Not Available – First paragraph follows: The ammonium source of nitrogen is often considered less desirable than other nitrogen sources for some plants. Nitrate is believed–by many people– to be superior to ammonium nitrogen for citrus, especially under acid soil conditions.
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Use of sorptive dusts on fleas: Control of fleas on cats and dogs achieved by treatment with dusts that are easily applied and nontoxic to pets or people
by I. Barry Tarshis
pp13-14, doi#10.3733/ca.v013n03p13
Abstract
Abstract Not Available – First paragraph follows: Dog and cat fleas–like so many other insects–have become resistant to a number of insecticides and pet owners report that flea infestations on pets are no longer being controlled by previously effective dusts and sprays containing chlordane, lindane and DDT. Additionally, the more effective insecticides do not last for very long periods of time and–because of their high toxicity–have to be used with caution on infested pets.
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General Information

The rural-urban fringe problem: Farm, suburban, and city interests have interdependence in decisions on expenditure of public money for public services
by Stephen C. Smith
pp2, doi#10.3733/ca.v013n03p2
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Migration habits of: The Ladybird Beetle
Editors
pp15, doi#10.3733/ca.v013n03p15
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