The movement of insects from one host plant to another is the common place activity upon which all transmission of plant virus diseases by arth ro pods depends. This movement is conditioned' by many factors, the normal life-hi story of the in sect, its host range and host preferences, the availability and condit ion of these hosts, and their status as virus reservoirs. Superim posing their determi nativ e influence on all these biotic factors are the physi cal factors of the environment. This discussion is concerned with the int er relationships of these factors. MOVEMENT, DISPERSAL, AND MIGRATION
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Walter Carter (1961) studied this question.