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does not appear. First page follows. A number of scientists have worked on the incubation period of the curly-top virus in the beet leafhopper, Eutettix tenellus (Baker), in which the infective principle passes into the mouth parts, alimentary canal, blood, salivary glands and out of the mouth parts in sufficient quantity to produce infection. It has been known for a long time that previously noninfective beet leafhoppers are able to transmit curly top in short periods after feeding on diseased beets. A number of theories have been published recently attempting to explain these short periods of curly-top transmission. A short review of the literature on this subject is given in the following paragraphs. Smith and Boncquet(13) state that not more than 3 hours of feeding were necessary to obtain the pathogenic factor, but that a period of at least 24 hours and not more than 48 hours must elapse before the insect could transmit the disease. These facts suggested to them that curly top was not transferred mechanically, but that some development or change took place within the body of the insect during the first few hours after feeding on a diseased plant.

Modes of curly-top transmission by the beet leafhopper, Eutettix tenellus (Baker)