Variations in Size and Weight of Three Geographical Populations of the Rice Weevil Complex

Two geographical populations of Sitophilus oryzae (L.) were obtained: small weevils from the Louisiana State University culture and intermediate-sized weevils from the Kansas State University culture. A third population of large weevils, S. zeamais Mot. was collected near Stuttgart, Arkansas. Specie...

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Bibliographic Details
Published in:Journal of the Kansas Entomological Society 1965-01, Vol.38 (1), p.1-9
Main Authors: Soderstrom, Edwin L., Wilbur, Donald A.
Format: Article
Language:English
Subjects:
Corn
Entomology
Grains
Population geography
Population mean
Population size
Rice
Sorghum
Weevils
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Summary:Two geographical populations of Sitophilus oryzae (L.) were obtained: small weevils from the Louisiana State University culture and intermediate-sized weevils from the Kansas State University culture. A third population of large weevils, S. zeamais Mot. was collected near Stuttgart, Arkansas. Species identification was as described by Floyd and Newsom in 1959. All weevils were reared in Ponca wheat, KS 1639 corn, and Atlas, Martin, Kansas Sourless, and Midland sorghums for five or more generations at 80° F and 70 percent R.H. Adults were weighed and the lengths of the pronotum and the right elytron were measured. Significant differences in size were noted between the three weevil populations in almost every culture medium. Weight differences are sufficient to permit species determination only when entire populations are under consideration. Measurements obtained in this work are compared to those reported in the literature.
ISSN:0022-8567
1937-2353