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Summary  

Stable isotope markers have been used to study animal nutrition for several decades and more recently to study the foraging and cultural habits of imported fire ants. In this work, we have extended that effort to evaluate the potential for marking boll weevils, Anthonomus grandis grandis Boheman (Coleoptera: Curculionidae), with the rare earth element samarium to aid in studies of insect invasion and pest eradication protocols. Neutron activation analysis (NAA) was performed on the marked boll weevils as well as plant material from the cotton squares on which the insects were fed. Samarium levels in non-dosed insects average about 20 ng/g or about 100 pg total element per insect. Our computed average determination limit was 36 pg samarium/weevil. The determination limit for cotton plant squares and leaves averaged 3.5 ng/g and 8.2 ng/g, respectively. These initial results indicate the NAA method is capable of identifying individual marked insects which have assimilated 1 ng of samarium, a ten-fold increase in content over average blank values.

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are considered to directly interact with one or more planes of a growing ice crystal. The ice lattice mimicry found in most AFPs is considered essential for their ice-binding function [ 12 – 14 ]. The beetle Anatolica polita (Coleoptera

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under the same conditions described above. Insecticidal Activity Insect Cultures Colonies of confused flour beetle, Tribolium confusum Jacquelin du Val (Coleoptera: Tenebrionidae

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western corn rootworm belongs to the class of insects (Insecta), the order of the beetles (Coleoptera), and the family of leaf beetles (Chrysomelidae) ( Leconte, 1868 ). It is a species of tropical origin with a gene center in Mexico ( Smith, 1966 ); its

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