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Distribution and Transmission of Iris yellow spot virus.
Iris yellow spot virus (IYSV), a new tospovirus associated with a disease in onion (Allium cepa) that is known to growers in Israel as "straw bleaching," was identified and further characterized by
Mutations in the HC-Pro gene of zucchini yellow mosaic potyvirus: effects on aphid transmission and binding to purified virions.
Findings support the 'bridge hypothesis', and confirm the binding of the HC-Pro to the virion, and the possible role of the PTK and KLSC motifs in binding to the virus and to the mouthparts of the aphid is discussed.
Mutations in the helper component protease gene of zucchini yellow mosaic virus affect its ability to mediate aphid transmissibility.
It is proposed that more than one site in HC-Pro may be functionally related to aphid transmissibility, particularly in the helper-deficient ZYMV.
Iris Yellow Spot Tospovirus Detected in Onion (Allium cepa) in Israel.
The detection of IYSV in Israel and the wide distribution of thrips in the natural vegetation may be an important constraint on onion and other bulb-crop production in Israel.
Lisianthus Leaf Necrosis: A New Disease of Lisianthus Caused by Iris yellow spot virus.
Western blot analysis showed that IYSV was serologically distinct from Tomato spotted wilt virus (TSWV), and the sequence of the cloned nucleocapsid gene confirmed the identity of IYSVs infection of lisianthus, thus confirming the first report of IysV infection in dicotyledons.
Particle bombardment drastically increases the infectivity of cloned DNA of zucchini yellow mosaic potyvirus.
An infectious full-length cDNA clone of the RNA genome of the potyvirus zucchini yellow mosaic virus (ZYMV) was constructed under the control of the cauliflower mosaic virus 35S promoter, allowing the detection of viral coat protein and virions after 2 and 3 days in systemically infected leaves and inoculated cotyledons respectively.
Plant Virus Transmission by Insects
12 paginas, 5 figuras, y 2 tablas Acknowledgements In memorial of Prof. Michael Thresh, for his outstanding contributions in the field of Plant Virus Epidemiology
Effect of endotoxic compounds isolated fromVerticillium lecanii on the sweetpotato whitefly,Bemisia tabaci
Toxic products extracted by methanol from intact mycelia ofVerticillium lecanii were tested for their toxicity to eggs, larvae, pupae and adults of Bemisia tabaci and additional insects, with larvae showing the highest, and adults the lowest, sensitivity.