Blackline in walnuts: Delayed failure of unions killing many walnut trees in central coastal counties

Serr, E

Blackline in walnuts: Delayed failure of unions killing many walnut trees in central coastal counties

Author

E. F. Serr

Author Affiliations

E. F. Serr is Pomologist, University of California, Davis.

Publication Information

Hilgardia 13(3):8-9. DOI:10.3733/ca.v013n03p8. March 1959.

PDF of full article, Cite this article

Abstract

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