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Journal of Entomology

Year: 2012 | Volume: 9 | Issue: 6 | Page No.: 413-421
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Authors

L.B. Silva

E.B. Torres

K.F. Silva

J.S.N. Souza

M.S. Lopes

L.H. Andrade

Z.F. Xavier

Keywords

The objective of this study was to evaluate, under laboratory conditions, the contact toxicity of the ethanolic extract of Croton heliotropiifolius on the main pest of stored maize, Sitophilus zeamais Motschulsky. Extract of the leaves of C. heliotropiifolius and maize weevil populations collected in four different storage units were used to determine whether the contact toxicity of ethanolic extract of C. heliotropiifolius in populations of Sitophilus zeamais incurs differentiated responses. After bioassays, we compared the mean mortality between the treatment and control groups. Insects were treated topically with the ethanolic extract of leaves of C. heliotropiifolius at a concentration of 10,000 ppm and mortality was assessed 24, 48 and 72 h after application. The mortality of S. zeamais adults from the four populations was significantly higher compared with to control in all evaluation periods. The mortality of S. zeamais adults (<15 days-old) topically treated with the extract increased with time of exposure to extract residues. The populations evaluated had different susceptibility in relation to contact with the ethanolic extract studied. According to the results obtained, it was concluded that the ethanolic extract of leaves of C. heliotropiifolius has contact insecticidal activity against adults of Sitophilus zeamais and that the response to this toxicity varies with the geographical origin of the population analyzed.
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