University of California

Biology of the African earwig, Euborellia cincticollis (Gerstaecker) in California and comparative notes on Euborellia annulipes (Lucas)


J. J. Knabke
A. A. Grigarick

Authors Affiliations

J. J. Knabke was a Graduate Research Assistant in the Department of Entomology, Davis; A. A. Grigarick was Professor and Entomologist in the Experiment Station, Davis.

Publication Information

Hilgardia 41(7):157-194. DOI:10.3733/hilg.v41n07p157. December 1971.

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Field-collected females of the African earwig produced and brooded up to 8 clutches of eggs. The total number of eggs produced at 72°-80°F averaged 83.7 with a range of 15-175. The average period of time from egg to adult was 128.5 days. Eggs completed embryogenesis only at 100 per cent RH and increased in weight and dimension during this period. Five nymphal instars (rarely four or six) occurred at 72°-80°F. Six or seven instars completed development at 90°-92°F. Only wingless individuals occurred at 72°-80°F while at 80°-85°F and 90°-92°F wingless, brachypterous and winged forms were produced. Light traps revealed that earwig flights occurred between July 14 and September 26 from sunset to about 10 P.M.

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Knabke J, Grigarick A. 1971. Biology of the African earwig, Euborellia cincticollis (Gerstaecker) in California and comparative notes on Euborellia annulipes (Lucas). Hilgardia 41(7):157-194. DOI:10.3733/hilg.v41n07p157
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