Transmission of carrot, parsley, and parsnip yellows by Cicadula divisa
AuthorHenry H. P. Severin
Author AffiliationsHenry H. P. Severin was Associate Entomologist in the Experiment Station.
Hilgardia 7(3):163-179. DOI:10.3733/hilg.v07n03p163. November 1932.
Abstract does not appear. First page follows.
A number of plant pathologists have called attention to a disease of carrots having most of the characteristic symptoms of yellows, but whether it was caused by the aster-yellows virus remained to be determined.
In New York, Whetzel(8) reported a yellows disease of carrots ranging from a trace to 25 per cent infection in the Williamson area. Folsom(1) found apparently the same carrot disease as described by Whetzel, at Orono, Maine, and on the experimental farm in the southwestern part of the state. Zundel(9) reported observations of yellows believed to be caused by the aster-yellows virus in carrots in Cumberland County, Pennsylvania. Vaughan and Foster(7) found a disease of carrots in Wisconsin resembling aster yellows and assumed that it may be due to the same virus. The diseased carrots were growing adjacent to an experimental aster-yellows plot. Newhall(3) reported a disease of carrots thought to be due to the aster-yellows virus in Wayne and Oswego counties, New York.
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 Kunkel L. O. Studies on aster yellows in some new host plants. Contrib. Boyce Thompson Inst. 1931. 3:85-123.
 Newhall A. G. Some special disease surveys in New York in 1929. The Plant Disease Reporter Suppl. 1930. 76:81-82. (Issued by the U. S. Dept. Agr. Bur. Plant Indus.)
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 Whetzel H. H. Diseases of muck crops in New York. The Plant Disease Reporter. 1929. 13:174 (Issued by the U. S. Dept. Agr. Bur. Plant Indus.)
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Reseeding burned rangeland: Competition between annual and perennial grasses studied to determine best seeding rates for good forage
Aphid damage to pears: Petal-fall application of parathion or malathon will effectively control all species damaging to pear fruit
Urea nitrogen as foliar spray: Application to citrus studied for effects on plant growth, leaf burn, root activity, and fruit quality
Codling moth on walnuts: Tests made on Payne walnuts in northern California compared effectiveness of sprays and types of sprayer
Virus-free cherry: Budwood of sweet cherry varieties developed free from known viruses
Northern fowl mite control: Effective control measures prove practical for use on large or small poultry farms
Orange industry trends: Changing economic relationships and technology affect returns and marketing practices of California growers
Efficiency in fruit marketing: Accuracy and cost of small-sample grading systems for California fruit packing houses
Per capita use of dairy foods: Consumption of dairy products studied in relation to size of income, age, and number of persons in a family