University of California

Effect of Bathyplectes curculionis on the alfalfa-weevil population in lowland middle California


A. E. Michelbacher

Author Affiliations

A. E. Michelbacher was Junior Entomologist in the Experiment Station, Division of Entomology and Parasitology, Berkeley, California.

Publication Information

Hilgardia 13(3):81-99. DOI:10.3733/hilg.v13n03p081. April 1940.

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Bathyplectes curculionis (Thoms.), a larval parasite of the alfalfa weevil, was introduced into Utah from southern Europe by the United States Department of Agriculture Bureau of Entomology during the years 1911 to 1913, inclusive. (Chamberlin (1924))4 has given a brief account of the introduction and establishment of this parasite, and in 1926 he published further data on this subject and called attention to the rapid spread and increase of the species.

After the discovery of the alfalfa weevil in the lowlands of middle California in May, 1932, the Bureau of Entomology,5 in 1933 and 1934, introduced Bathyplectes (fig. 1) into this new area.

Literature Cited

Chamberlin T. R. Introduction of parasites of the alfalfa weevil into the United States. U. S. Dept. Agr. Dept. Cir. 1924. 301:1-9.

Chamberlin T. R. The Introduction and establishment of the alfalfa weevil parasite. Bathyplectes curculionis (Thoms.) in the United States. Jour. Econ. Ent. 1926. 19(2):302-10.

Michelbacher A. E., Essig E. O. Report on alfalfa weevil investigations in California. Jour. Econ. Ent. 1934a. 27(5):960-66.

Michelbacher A. E., Essig E. O. A progress report on the behavior of the alfalfa weevil in middle California. Jour. Econ. Ent. 1934b. 27(6):1119-27.

Michelbacher A. E., Essig E. O. Field observations on the alfalfa weevil in middle California. California State Dept. Agr. Mo. Bul. 1935. 24(4, 5, 6):221-31.

Newton J. H. The alfalfa weevil in Colorado. Colorado Agr. Exp. Sta. Bul. 1933. 399:1-19.

Reeves G. I., Hamlin J. C. The use of mathematics in the alfalfa weevil investigations. Rept. Eighth Rocky Mt. Conf. Ent. 1931a. pp.11-16. (Mimeo.)

Reeves G. I., Hamlin J. C. The mathematical approach to insect problems. Rept. Eighth Rocky Mt. Conf. Ent. 1931b. pp.17-25. (Mimeo.)

Michelbacher A. 1940. Effect of Bathyplectes curculionis on the alfalfa-weevil population in lowland middle California. Hilgardia 13(3):81-99. DOI:10.3733/hilg.v13n03p081

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