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VOL. 6, ISSUE 6 (2021)
Effect of the insect population and storage periods on the secretion of benzoquinones by Sitophilus oryzae L. in wheat flour
Authors
Salem M S, Nilly A H Abdelfattah, Gehad M Khattab
Abstract
The present investigation was carried out to study effect of different population densities and storage periods on benzoquinones as toxicants secretion caused by Sitophilus oryzae L. (Coleoptera: Curculionidae),in wheat flour. The obtained results showed that loss of wheat grains significantly increased with increasing storage periods and different insect densities. The highest density 20 pairs of S. oryzae L. achieved the highest weight loss percentage (22.90±0.55%) after three months storage period. The secreted benzoquinones compounds {Methyl-1,4-benzoquinone (MBQ) and Ethyl 1, 4-benzoquinone (EBQ)} by S. oryzae were detected in all insect densities and storage periods. Ethyl-benzoquinone was higher than mthyl-benzoquinone at all insect densities and storage periods. The benzoquinones secreted by S. oryzae were directly proportional to the insect densities and the storage periods. The total secretions of BQs released by S. oryzae were 16.394±0.36 and 27.73±0.63 (mg/g wheat flour) recorded with the total insect densities510.00±3.54 and 2150.00±6.20insect after one and three months storage periods, respectively. Total concentration levels of the benzoquinones were 28.58± 1.29, 46.10±1.22 and 59.94±1.54 μg/g wheat flour per insect increased with increasing of insect densities, 5 adult pairs, 10 adult pairs and 20 adult pairs, respectively. In conclusion, the benzoquinones compounds (MBQ and EBQ) were produced by S. oryzae as defensive secretions and MBQs is the first detection with S. oryzae in this study.
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Pages:256-261
How to cite this article:
Salem M S, Nilly A H Abdelfattah, Gehad M Khattab "Effect of the insect population and storage periods on the secretion of benzoquinones by <em>Sitophilus oryzae </em>L<em>. </em>in wheat flour ". International Journal of Entomology Research, Vol 6, Issue 6, 2021, Pages 256-261
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