By Kenneth M. Smith
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Additional info for A Textbook of Plant Virus Diseases
T h e r e appear to be no leaf symptoms, b u t rough brown patches, stripes and, in some cases, rings, develop on the skin of the fruits. Sometimes quite large areas of the skin are roughened a n d browned (Fig. 7B). T h e patches are rarely cracked ; the fruits remain small a n d fall into the lowest commercial grades. Several severely affected trees have shown sparse foliage, but die-back and delayed foliation, characteristic of star crack disease, have not been observed (van Katwijk and Meijneke, 1963a).
Differential h o s t s . Necrotic local lesions with a halo develop on the inoculated leaves of Gomphrena globosa, a n d dark lesions with a light centre on Ocymum basilicum. Diseases caused and host range Cynarus scolymus L. 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).
Cardunculus) by mechanical juice inoculations. Thus far only artichoke, cardoon, zinnia, a n d milk thistle (Silybum marianum) have been found to be hosts. Replacement of infected artichokes with disease-free plants is the first step in its control. ARTICHOKE (CALIFORNIA) LATENT VIRUS The Virus TRANSMISSION. T h e virus is mechanically transmissible, particularly with the addition of a n abrasive. T h e virus is readily inactivated when transmitted from artichoke leaves so that the addition of a reducing agent such as sodium sulphite is advisable.
A Textbook of Plant Virus Diseases by Kenneth M. Smith