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.

PDF of full article, Cite this article


Abstract does not appear. First page follows.


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

Also in this issue:

The rural-urban fringe problem: Farm, suburban, and city interests have interdependence in decisions on expenditure of public money for public services

Hybrid cotton breeding program: Limited quantity of cotton hybrids produced for scientific use but seed production on commercial scale not yet possible

Stem borer found on safflower: Infestation discovered in planting at Davis may be first recorded attack on safflower by known pest of other plants

Lime-induced chlorosis studied: Physiology of disorder investigated to learn role of malonic acid and possibility of a block in organic acid metabolism

New disease resistant tomatoes: Improved strains of varieties Pearson and Red Top developed in plant breeding program at Davis and released to seedsmen

Blackline in walnuts: Delayed failure of unions killing many walnut trees in central coastal counties

Walnut aphid investigations: Evaluation of new and old aphicides object of experiments conducted in northern California test plots in 1958 season

Ponderosa pine planting stock: Studies indicate that time of lifting and length of storage before replanting influence survival of ponderosa seedlings

Ammonium bicarbonate toxicity: Root injury occurred from within few hours to several weeks in solution culture tests with citrus, avocado, and soybeans

Use of sorptive dusts on fleas: Control of fleas on cats and dogs achieved by treatment with dusts that are easily applied and nontoxic to pets or people

Migration habits of: The Ladybird Beetle

The apparent climatic limitations of the alfalfa weevil in California

Webmaster Email: sjosterman@ucanr.edu