A strain of potato-virus Y inducing local and systemic necrotic spots on leaves of tobacco white burley
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Expressed juice of a spontaneously infected plant ofSolanum sp. induced small round, yellow chlorotic spots on the inoculated and the younger leaves of plants ofNicotiana Tabacum var. White Burley. They are frequently accompanied by stunting of the plant and by veinbanding of the young leaves. No symptoms could be induced inDatura stramonium, whereasNicotiana glutinosa presented only veinbanding and crinkling of the leaves. The thermal inactivation point was found to lie between 55° and 60° C. The round, yellow spots on leaves of White Burley could be induced not only by sap inoculation, but also by viruliferous aphids of the speciesMyzus persicae, (Sulz.). By using batches of 10 apterae ofMyzus persicae for each test plant and by choosing an acquisition feeding period of 5 minutes following a starvation period of 3 hours, the yellow, round spots could be induced in 100 per cent of the tobacco plants inoculated. We consider the causal virus under study a strain of potato-virus Y, possibly related to the necotic strains.
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