Predation on aphids in California’s alfalfa fields

P. Neuenschwander, K. S. Hagen and R. F. Smith

Hilgardia, 1975, vol. 43, issue 2

Abstract: Alfalfa fields in two climatically different regions were sampled for aphids and their natural enemies throughout 3 years (1957-1959). The fields were under an integrated control program and therefore received minimum amounts of insecticides. The four imported parasites of the spotted alfalfa aphid and the pea aphid were not yet important in the study area, so predators were mainly responsible for the high degree of naturally occurring biological control. By pooling the data of entire regions, it was possible to follow changes in populations of these mobile predators more accurately than is possible from surveys of single fields because short-distance migration resulting from harvesting practices as well as uneven distribution could be neglected.

Keywords: Environmental; Economics; and; Policy (search for similar items in EconPapers)
Date: 1975
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