Aster yellows virus in celery: Spray treatment of natural breeding area of aster leafhopper controls spread of important virus disease to celery fields
AuthorsJ. H. Freitag
T. M. Aldrich
R. M. Drake
Authors AffiliationsJ. H. Freitag is Professor of Entomology, University of California, Berkeley; T. M. Aldrich is Farm Advisor, San Luis Obispo County, University of California; R. M. Drake is Deputy Agricultural Commissioner, San Luis Obispo County.
Hilgardia 13(4):5-5. DOI:10.3733/ca.v013n04p5. April 1959.
Annual losses as high as 30% –caused by aster yellows virus–have been cut to 5% by growers of the Arroyo Grande Valley of San Luis Obispo County who annually produce about 1,200 acres of celery valued at approximately $2.-500,000.
Also in this issue:Cotton price and production: Lower total farm earnings in 1959 prospect for California growers whether operating under Allotment Plan A or Plan B
Commercial cut flower industry: Further production increases without substantial increase in acreage may cause changes in successful marketing practices
Gibberellins on chrysanthemum: Properly timed applications of potassium gibberellate sprays improved flower shape of two commercial varieties of pompon
Summer-planted solana berries: Tests in southern California and also at Davis show early summer plantings of new strawberry yield with variety Lassen
Herbicides on rangeland forage: Reduction of plant competition during seedling establishment on annual ranges by application of pre-emergence herbicides
Herbicides on white potatoes: Weed control field trials with seven herbicides conducted in San Bernardino County with varying results in effectiveness
Codling moth investigations: Severe infestations in northern California walnut orchards in 1958 followed conditions favorable to the second brood
Parathion resistant mites: Performance of new acaricides evaluated in trials against strain of mites known to be resistant to phosphate compounds
Poultry house cleanout machine: Manure pickup device designed for use in obstruction-free area under strings of poultry cages shows high efficiency
Management of: Second growth stands of Douglas-fir
Nitrate concentration and ion balance in relation to citrus nutrition