University of California

A guide to the spider mites of cotton


Edward W. Baker
A. Earl Pritchard

Authors Affiliations

Edward W. Baker was Acarologist, United States Department of Agriculture, Agricultural Research Administration, Bureau of Entomology and Plant Quarantine; A. Earl Pritchard was Associate Professor of Entomology, University of California, Berkeley, and Associate Entomologist in the California Agricultural Experiment Station.

Publication Information

Hilgardia 22(7):203-234. DOI:10.3733/hilg.v22n07p203. July 1953.

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Spider mites are increasingly serious pests of cotton and forage crops. Because the acaricides now being developed are often highly selective among species, entomologists concerned with the control of these pests need to know the particular species they are dealing with. This report has been prepared to aid them. Both field guides and taxonomic keys are given. Suggestions are offered on how to sample, how to prepare slides, and what diagnostic characters to look for.

One new species from Nicaragua is described, and new synonymy is noted for several others. The species treated—all those reported from cotton in North and Central America—are:

Petrobia latens (Müller)

Paratetranychus peruvianas McGregor

Paratetranychus mcgregori new species

Tetranychus pacificus McGregor

Tetranychus schoenei McGregor

Tetranychus canadensis (McGregor)

Tetranychus bimaculatus Harvey

Tetranychus atlanticus McGregor

Tetranychus marianae McGregor

Tetranychus desertorum Banks

Tetranychus tumidus Banks

In addition, some species reported from cotton in other parts of the world are noted, and a new combination, Paratetranychus stenoperitrematus (Ugarov and Nikolskii), is given for one of them.

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Baker E, Pritchard A. 1953. A guide to the spider mites of cotton. Hilgardia 22(7):203-234. DOI:10.3733/hilg.v22n07p203
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