Results 161 to 170 of about 3,112 (203)
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Response of mycorrhizal periwinkle plants to aster yellows phytoplasma infection
Mycorrhiza, 2009The objective of our research was to assess if arbuscular mycorrhizal (AM) fungal colonization can modify the effect of infection by two aster yellows phytoplasma strains (AY1, AYSim) in Catharanthus roseus plants. Both phytoplasma strains had a negative effect on the root fresh weight, but they differed in symptoms appearance and in their influence on
Maria, Kamińska +3 more
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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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Aster Leafhopper and Aster Yellows Control in Carrot, 1983
Insecticide and Acaricide Tests, 1984Abstract Three insecticides were evaluated to determine their effects on the aster leafhopper and its transmission of aster yellows (mycoplasma-like organism) to carrots. The trial was conducted at the Univ. of Minnesota Agric. Exp. Stn., Rosemount, Minn. Each plot had two 20-ft rows (40-in.
David W. Ragsdale +2 more
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Aster Leafhopper and Aster Yellows Control in Carrot, 1984
Insecticide and Acaricide Tests, 1985Abstract Three insecticides were evaluated to determine their effects on the aster leafhopper and its transmission to aster yellows (mycoplasma-like organism) to carrots. The trial was conducted at the University of Minnesota Agricultural Experiment Station, Rosemount, MN.
David W. Ragsdale, Dwi P. Setiawan
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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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Multilocus typing of aster yellows phytoplasmas infecting lettuce withyellowing in Calabria, Italy
Phytopathogenic Mollicutes, 2021Lettuce is an important vegetable crop commercially produced in many countries and affected by several bacterial diseases. The presence of phytoplasmas in lettuce plants growing in open field in Calabria region (Southern Italy) and showing yellowing and leaf necrosis was detected by PCR assays with primers amplifying 16S rRNA gene sequence.
Contaldo N. +4 more
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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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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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