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- W60644401 abstract "As is true of most crops grown in Arizona, lettuce has its share of virus diseases. Probably the best known of these is the seed transmitted lettuce mosaic. However, the long recognized big vein disease is also ever present. Recently, several other virus diseases have been discovered in commercial lettuce fields in Arizona, namely cucumber mosaic and alfalfa mosaic. However, the presence of spotted wilt or San Pablo blight, long thought to be a disease of Arizona lettuce, has not been confirmed. Lettuce Diseases Present Big Vein Virus: Big vein virus. This virus disease has long been present in Arizona lettuce fields. The virus causes, as the name suggests, enlarged veins in the leaves of lettuce. In addition, the leaf margins become frilled and distorted, giving fields ( or areas in a field ) a very different appearance than healthy lettuce fields. This is a unique virus when compared with others in Arizona lettuce because it is soil -borne. The virus cannot be transmitted from plant to plant by any means other than a very small soilinhabiting fungus, Olpidium brassicae, or by grafting. Since grafting does not occur in the field, transmission to lettuce, insofar as is now known, occurs solely through infection of the lettuce root by this fungus. As most growers know, this disease occurs year in and year out in roughly the same areas of a given field." @default.
- W60644401 created "2016-06-24" @default.
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- W60644401 date "1967-01-01" @default.
- W60644401 modified "2023-09-27" @default.
- W60644401 title "Virus Diseases of Lettuce in Arizona" @default.
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