Vacuum cleaner principle applied in sampling insect populations in alfalfa fields by new machine method

Abstract

Accurate estimates of the total insect population of an alfalfa field can be obtained by the use of newly developed equipment and sampling techniques. All species of insects—each in relation to the whole as well as one to another—and measurement of the separate life stages, and appraisal of the ratios of the beneficial biological control organisms to the harmful plant-feeders can be made.