Abstract
Natural spread of citrus tristeza virus (CTV) in Israel was first observed in 1970 in the Hibbat Ziyyon area (Bar-Joseph et al. 1972). The disease had been found as early as 1956, mainly in introduction plots, but without any indication of natural spread (Reichert and Bental, 1960). Subsequently, it was shown that the tristeza strain VT, from the area in the Sharon Plain where natural spread was observed, is efficiently transmitted by Aphis gossypii Glov. (Bar-Joseph and Loebenstein, 1973). Transmission rates averaging 40% (with 100 aphids in each test) were obtained, compared with less than 5% with two other isolates, CT and ST. The high rate of transmission with
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