“…When placed on a piece of leaf or a feeding membrane, fasted aphids spent little time wandering around and usually made no, or only a brief, exploration of the surface with the labium before making a probe, whereas non-fasted aphids usually spent some time wandering about and then spent a few seconds exploring the surface with the labium before probing. These results are in agreement with earlier reports using different virus-aphid combinations (Bradley, 1952;Day & Irzykiewicz, 1954;LopezAbella et al, i988;Nault & Gyrisco, 1966;Powell, 1993;Swenson, 1960;Taylor & Robertson, 1974).…”