By Kenneth M. Smith

ISBN-10: 0126513503

ISBN-13: 9780126513509

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Globe artichoke. Symptoms consist of a severe crinkle mosaic with malformation a n d puckering of the leaf blade. T h e r e is a severe reduction in the interveinal parenchymatous tissues (Figs. 9A—D). Other hosts include Mcotiana clevelandii a n d N. glutinosa, if infected from t h e former species (Martelli, 1965). ASH CHLOROTIC NECROTIC RINGSPOT VIRUS A virus has been isolated from ash, Fraxinus excelsior, in Bologna. T h e symptoms are those of a leaf-spot disease, characterized by numerous small, circular, chlorotic areas, enclosing minute necrotic patches, particularly towards the leaf edges and tips.

During October a n d November, in New Zealand, symptoms are indistinct, a n d do not become conspicuous until late December or early J a n u a r y . Symptoms are general throughout infected trees, b u t have not been observed on small immature leaves. Fruits from infected trees are misshapen, growth being restricted on that portion of the fruit opposite the suture. Depressions occur on either side of the fruit near the stem cavity, giving the impression that the fruits have been 37 Apricot Ring Pox Virus pinched.

I n other cases mottling may take the form of a light a n d dark green mosaic, or of large vaguely defined patches of yellowish-white tissue. O n e or all of these symptoms m a y be present on a single tree, or even on a single branch. All leaves on a shoot m a y show symptoms, although it is more usual to find a few mottled leaves among apparently normal ones. No fruit symptoms have been observed (Atkinson a n d Chamberlain, 1949) (Fig. 6). H o s t r a n g e . Apple mosaic virus has been transmitted by grafting to a wide range of species in the genera Malus, Pyrus, Sorbus, Cydonia, Crataegus, Chaenomeles, Prunus and Fragaria, in all of which mosaic leaf patterns were produced (Posnette, 1963b).

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A Textbook of Plant Virus Diseases by Kenneth M. Smith

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