. The efficacy and economic effects of plant quarantines in California : report of a committee . PORT SAN ilKS Fig. 2.—Eelief map of California, showing protection of agricultural valleys by natural barriers consisting of the Pacific Ocean and high mountain ranges; also showing seaports, border highway inspection stations, and railway entrances. (Copy- right by H. A. Sedelmeyer.) In general it may be said, then, that California, from the standpoint of pest and disease introduction is fortunately situated so far as natural dispersal is concerned by reason of barriers and is unfortunately situat
. The efficacy and economic effects of plant quarantines in California : report of a committee . PORT SAN ilKS Fig. 2.—Eelief map of California, showing protection of agricultural valleys by natural barriers consisting of the Pacific Ocean and high mountain ranges; also showing seaports, border highway inspection stations, and railway entrances. (Copy- right by H. A. Sedelmeyer.) In general it may be said, then, that California, from the standpoint of pest and disease introduction is fortunately situated so far as natural dispersal is concerned by reason of barriers and is unfortunately situated in regard to the introduction and establishment of pests and diseases by human agency because of the great variety of crops grown and the exposure due to the extensive tourist travel and the foreign commerce that passes through her ports.
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Keywords: ., bookcentury1900, bookpublisherberk, booksubjectagriculturalpests
