University of California

Within-plant distribution of predators on cotton: Comments on sampling and predator efficiencies


L. T. Wilson
A. P. Gutierrez

Authors Affiliations

L. T. Wilson was formerly Graduate Student, Department of Entomology, Davis, is employed at Plant Industry, CSIRO, Narrabri, N.S.W., Australia, 2390; A. P. Gutierrez was Entomologist, Division of Biological Control Department of Entomological Sciences, Berkeley.

Publication Information

Hilgardia 48(2):3-11. DOI:10.3733/hilg.v48n02p009. February 1980.

PDF of full article, Cite this article


Within-plant distribution of four predators found in California cotton fields is described. Adult stages of all predators were found in greatest frequency in the terminal portions of the plant, and, within that region, adults tended to be more common on fruiting parts than the same species of larvae. In general, the smaller predators, Geocoris and Orius, were found higher on the plant than the larger predators Cbrysopa (larvae) and Nabis. Their respective areas of activity corresponded to the location of suitably sized (stages) prey. Those predators closest to the plant terminal were more effectively sampled with the standard University of California sweepnet.

Literature Cited

Byerly K. F., Gutierrez A. P., Jones R. E., Luck R. F. Comparison of sampling methods for some arthropod populations in cotton. Hilgardia. 1978. 46:257-282. DOI: 10.3733/hilg.v46n08p257 [CrossRef]

Ehler L. E., Eveleens K. G., van den Bosch R. An evaluation of some natural enemies of cabbage looper in cotton in California. Environ. Entomol. 1973. 2:1009-15.

Eveleens K. G., van den Bosch R., Ehler L. E. Secondary outbreaks induction of beet armyworm by experimental insecticide application in cotton in California. Environ. Entomol. 1973. 2:497-503.

Falcon L. A., van den Bosch R., Gallagher J., Davidson A. Investigation of the pest status of Lygus hesperus in cotton in Central California. J. Econ. Entomol. 1971. 64:56-61.

Frazer B. D., Gilbert N. E. Coccinellids and aphids: A qualitative study on the impact of adult lady birds (Coleoptera: Coccinellidae) preying on field populations of pea aphids (Homoptera: Aphididae). J. Entomol. Soc. B. C. 1976. 73:

Gutierrez A. P., Falcon L. A., Loew W., Leipzig P. A., van den Bosch R. An analysis of cotton production in California: A model for Acala cotton and the effects of defoliators on its yields. Environ. Entomol. 1975. 4:125-36.

Smith J. W., Stadelbacher E. A., Grant C. W. A comparison of techniques for sampling beneficial arthropod populations with cotton. Environ. Entomol. 1976. 5:435-44.

Stern V. M., Smith R. F., van den Bosch R., Hagen K. S. The integration of chemical and biological control of the spotted alfalfa aphid. The integrated control concept. Hilgardia. 1959. 29:81-101. DOI: 10.3733/hilg.v29n02p081 [CrossRef]

van den Bosch R., Hagen K. S. Predaceous and parasitic arthropods in California cotton fields. Calif. Agric. Exp. Sta. Bull. 1966. 820:1-32. http://archive.org/details/predaceousparasi0820vand

Zar J. H. Biostatistical analysis. 1974. Prentice-Hall, Inc. XV + 620p.

Wilson L, Gutierrez A. 1980. Within-plant distribution of predators on cotton: Comments on sampling and predator efficiencies. Hilgardia 48(2):3-11. DOI:10.3733/hilg.v48n02p009
Webmaster Email: sjosterman@ucanr.edu