Blackline in walnuts: Delayed failure of unions killing many walnut trees in central coastal counties
AuthorE. F. Serr
Author AffiliationsE. F. Serr is Pomologist, University of California, Davis.
Hilgardia 13(3):8-9. DOI:10.3733/ca.v013n03p8. March 1959.
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.
Also in this issue:The rural-urban fringe problem: Farm, suburban, and city interests have interdependence in decisions on expenditure of public money for public services
Hybrid cotton breeding program: Limited quantity of cotton hybrids produced for scientific use but seed production on commercial scale not yet possible
Stem borer found on safflower: Infestation discovered in planting at Davis may be first recorded attack on safflower by known pest of other plants
Lime-induced chlorosis studied: Physiology of disorder investigated to learn role of malonic acid and possibility of a block in organic acid metabolism
New disease resistant tomatoes: Improved strains of varieties Pearson and Red Top developed in plant breeding program at Davis and released to seedsmen
Walnut aphid investigations: Evaluation of new and old aphicides object of experiments conducted in northern California test plots in 1958 season
Ponderosa pine planting stock: Studies indicate that time of lifting and length of storage before replanting influence survival of ponderosa seedlings
Ammonium bicarbonate toxicity: Root injury occurred from within few hours to several weeks in solution culture tests with citrus, avocado, and soybeans
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
Migration habits of: The Ladybird Beetle
Effect of Bathyplectes curculionis on the alfalfa-weevil population in lowland middle California
The apparent climatic limitations of the alfalfa weevil in California