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Population growth of Cryptolestes ferrugineus and C. pusillus (Coleoptera: Cucujidae) alone, or in competition in stored wheat or maize at different temperatures

Published online by Cambridge University Press:  10 July 2009

Noel D.G. White ,
Colin J. Demianyk ,
Hitoshi Kawamoto  and
Ranendra N. Sinha
Noel D.G. White*
Affiliation:
Agriculture and Agri-Food Canada, Research Centre, Winnipeg, Canada
Colin J. Demianyk
Affiliation:
Agriculture and Agri-Food Canada, Research Centre, Winnipeg, Canada
Hitoshi Kawamoto
Affiliation:
Naguchi Thyroid Clinic and Hospital Foundation, Beppu, Oita, Japan
Ranendra N. Sinha
Affiliation:
Retired: Agriculture and Agri-Food Canada, Research Centre, Winnipeg, Canada
*
Noel D.C. White, Agriculture and Agri-Food Canada, Research Centre, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9.
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Abstract

Cryptolestes ferrugineus (Stephens) and C. pusillus (Schönherr) were reared separately at initial densities of 20 or 40 adults each and together at an initial density of 20 adults/100 g cracked wheat or cracked maize at 35, 30, 25, and 20°C and 70% r.h. for developmental periods of 10, 11, 16, or 40 weeks, respectively. Intraspecific competition in the 40-adult treatments restricted population growth to levels similar to 20-adult treatments for each species; impact was greatest for C. pusillus on maize at 30°, where the population of the 40-adult treatment was less than half that of the 20-adult treatment. Both species produced larger populations on wheat than on maize, except for C. pusillus at 35°C; mortality for both species was high on wheat at 35°C. Interspecific competition resulted in significantly reduced populations relative to single species populations for both C. ferrugineus at 30, 25, and 20°C and C. pusillus at 35, 30, and 25°C on wheat and for C. ferrugineus at 25 and 20°C and C. pusillus at 35, 30, and 25°C on maize. During interspecific competition, C. ferrugineus was more successful in multiplying at 35 and 30°C on wheat and 35°C on maize; both species multiplied equally well at 25°C on wheat or 30 and 25°C on maize; C. pusillus multiplied best at 20°C on both wheat and maize. Cryptolestes pusillus reproduces more effectively alone or in interspecific competition under cool conditions, although C. ferrugineus occurs with much greater frequency in cool Canadian stored grain, probably because of cold-hardiness and winter survival

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 85 , Issue 3 , September 1995 , pp. 425 - 429
Copyright
Copyright © Cambridge University Press 1995

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