Ornamental flowering plants naturally infected with curly-top and aster-yellows viruses
AuthorsHenry H. P. Severin
Julius H. Freitag
Authors AffiliationsHenry H. P. Severin was Associate Entomologist in the Experiment Station; Julius H. Freitag was Research Assistant in the Experiment Station.
Hilgardia 8(8):233-260. DOI:10.3733/hilg.v08n08p233. September 1934.
Abstract does not appear. First page follows.
A few of the virus diseases have been experimentally transmitted to many species of plants in different genera. of many families. The host range of virus diseases as determined by experimental infection often does not coincide with the food and breeding plants preferred by the insect vector of the disease under natural conditions: preferred food and breeding plants of the insect under field conditions are sometimes immune to virus diseases; and the insect cannot live for more than a few days in captivity on some host plants that are highly susceptible to virus diseases in the natural environment. A review of the literature on the host range of certain virus diseases as determined by experimental and natural infection follows.
Kunkel(8),(9) reported that he experimentally transmitted aster yellows with Cicadula divisa Uhl. to 170 species in 150 genera belonging to 38 families. He transmitted the disease to asters from 40 different species of plants experimentally infected with yellows. There is no record of the natural occurrence of yellows on most of the plants experimentally infected with the disease. Three methods were used by him in determining whether a plant was naturally infected with yellows. In the first method the virus was recovered by previously noninfective leafhoppers from the naturally infected plants and transferred to asters.
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Wind machine tests in citrus: Frost protection studies in 1954 confirmed earlier findings next to be investigated in deciduous trees
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Temperature and lettuce losses: Variables of time and temperature as they affect deterioration of harvested lettuce investigated
Weed host range and overwintering of curly-top virus