Comparative studies were done on the reproductive rates of Sitophilus oryzae (L.) and Rhyzopertha dominica (F.) in relation to physical properties of the predominant U.S. varieties of hard red winter, soft red winter, hard red spring, white, and durum wheats. Reproductive rates of both species differed significantly among the classes, and quantitative data were obtained that may be useful in modeling population growth on the different classes. White wheats were most susceptible to both species, but the ranking of the other classes differed between the two species. Within the classes of wheat, virtually no significant differences between varieties in reproductive rates of either species were apparent. Variation between production sites exceeded that between varieties. Kernel size and density were not suitable criteria for distinguishing between the classes and did not correlate well with reproduction by either species. Kernel hardness differed among the classes and correlated well with S. oryzae reproduction but not with R. dominica. S. oryzae appeared to be sensitive to kernel hardness only when differences were quite large, such as between classes. Small differences in hardness between or within varieties within a class had little effect on S. oryzae reproduction.
Document Type: Research Article
Publication date: June 1, 1990
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Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.