Results 151 to 160 of about 29,697 (193)
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ASTER YELLOWS ON CELERY IN ONTARIO
Canadian Journal of Plant Science, 1957A disease of celery reported by vegetable growers in the Niagara Peninsula, Ontario, in 1953 is caused by the aster yellows virus. Transmissions under controlled conditions to various host plants by the leafhoppers Macrosteles fascifrons (Stål) and Fieberiella florii (Stål) indicate that the strain of the disease is similar to that present in ...
J. A. George, J. K. Richardson
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Multiplication of aster yellows virus in a nonvector leafhopper
Virology, 1967Abstract Aster yellows virus (AYV) was recovered at various times from a nonvector, Agallia quadripunctata Prov., after the insects were exposed to infected plants. The presence of virus in exposed nonvector insects was demonstrated by injecting extracts of the insects into healthy leafhoppers of the vector, Macrosteles fascifrons (Stal), and then ...
R C, Sinha, L N, Chiykowski
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Monoclonal Antibodies Against the Aster Yellows Agent
Science, 1985Hybridoma clones secreting specific monoclonal antibodies against the aster yellows agent, a mycoplasma-like organism, were produced by using partially purified salivary gland preparations from infected leafhopper vectors as the immunogen. After 3947 hybridomas from 20 independent fusions were screened for specific antibody against the aster yellows ...
C P, Lin, T, An Chen
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ASTER YELLOWS RESISTANCE EN FLAX
Canadian Journal of Plant Science, 1961A search for a source of resistance in flax to the virus disease called aster yellows was initiated in 1958. The variety Abyssinian (C.I. 302) from the World Collection of flax contributed a greater number of plants free from aster yellows symptoms than other varieties tested.
A. L. D. Martin +2 more
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Influence of Aster Yellows Phytoplasma on the Fitness of Aster Leafhopper (Homoptera: Cicadellidae)
Annals of the Entomological Society of America, 2000This study revealed that feral aster leafhoppers, Macrosteles quadrilineatus Forbes, exposed to aster yellows phytoplasma live longer and may lay more eggs than nonexposed leafhoppers. Aster leafhoppers were reared on asters infected with either of 2 strains of aster yellows phytoplasma or uninfected asters.
L. Beanland +3 more
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Multigene Sequence Analysis of Aster Yellows Phytoplasma Associated with Primrose Yellows
Journal of Phytopathology, 2015AbstractPrimula acaulis (L.) Hill. plants showing stunting, leaf‐yellowing and virescence were first discovered in the Czech Republic. Polymerase chain reactions with subsequent restriction fragment length polymorphism analyses and sequencing enabled classification of the detected phytoplasmas into the aster yellows group, ribosomal subgroup 16SrI‐B ...
Jana Fránová +4 more
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Cryopreservation of aster yellows agent in whole leafhoppers
Canadian Journal of Microbiology, 1977Aster yellows agent was preserved in an infectious state in leafhoppers (Macrosteles fascifrons) that had been fed on infected asters and then frozen and stored as whole insects at −64 °C for up to 2 years. No difference in infectivity was observed between extracts prepared from insects stored at −28 and −64 °C for up to 21 weeks.
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Canadian Journal of Plant Science, 1972
Several contact and systemic insecticides were effective in reducing populations of the aster leafhopper. The reduced populations were associated with a reduced incidence of aster yellows in barley, flax, and lettuce and an increased seed yield of barley, particularly with insecticide treatments that provided good protection during the seedling stage.
P. H. WESTDAL, H. P. RICHARDSON
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Several contact and systemic insecticides were effective in reducing populations of the aster leafhopper. The reduced populations were associated with a reduced incidence of aster yellows in barley, flax, and lettuce and an increased seed yield of barley, particularly with insecticide treatments that provided good protection during the seedling stage.
P. H. WESTDAL, H. P. RICHARDSON
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Delayed expression of aster yellows symptoms in celery
Canadian Journal of Botany, 1978Two strains of aster yellows agent, one resembling a typical 'noncelery-infecting' or eastern type (EAYA) and the other a 'celery-infecting' or western type (CAYA), were compared for their ability to infect celery. Seventy-four percent of the plants inoculated with EAYA and 100% inoculated with CAYA developed symptoms.
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Journal of Economic Entomology, 1993
The aster yellows infectivity of aster leafhopper, Macrosteles quadrilineatus Forbes, populations collected from carrot fields at several locations in Wisconsin was determined weekly during two growing seasons to determine the need for control measures. Aster yellows infectivity of the collected insects varied both spatially among local populations and
Susan E. Rice Mahr +2 more
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The aster yellows infectivity of aster leafhopper, Macrosteles quadrilineatus Forbes, populations collected from carrot fields at several locations in Wisconsin was determined weekly during two growing seasons to determine the need for control measures. Aster yellows infectivity of the collected insects varied both spatially among local populations and
Susan E. Rice Mahr +2 more
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