Abstract
The widespread use of the insecticides for controlling the destructive pest, red palm weevil (Rhynchophorus ferrugineus), raises the question about efficacy the chitin synthesis inhibitors (CSIs). Therefore, this study aims to explore the tested CSIs acute toxicity on the field strain of red palm weevil. Also, some biochemical changed in the 6th instar larvae after treatment with tested LC50s were measured. The LC50 values of chlorfluazuron, hexaflumuron, and lufenuron were determined at 454.01,1293.02 and 919.13 µg/ml, respectively for the 6th larval instar exposed using the food dipping method. The lufenuron showed the lowest significant reduction in total protein (7.29%) accompanied with activation GST, s-esterase, carboxylesterase, phenoloxidase, chitinase, and ɑ-Esterase recorded 58.50, 58.54, 26.09, 22.56, 11.52 and 7.77% increasing respectively. The chlorfluazuron showed mediated significant reduction in total protein (23.54%) accompanied with activation GST, s-esterase and carboxylesterase and chitinase recorded 24.90, 23.94, 4.89 and 2.28 % increasing respectively. The highest significant reduction in total protein (45.96%) with hexaflumuron treatment accompanied with activation GST, carboxylesterase and chitinase recorded 48.02, 38.86 and 25.22% increase respectively.
Highlights
Phoenix dactylifera L. is widely cultivated across northern Africa, the Middle East, the horn of Africa and South Asia, and is naturalized in many tropical and subtropical regions worldwide (“World Checklist of Selected Plant Families: Royal Botanic Gardens, Kew,” n.d.)
Among the different classes of chemical insecticides, insect growth regulators (IGRs) class causes an adverse effect on insect growth and development by interfering with specific biochemical pathways or processes
The present work was carried out to evaluate the biochemical effects of LC50 of three chitin synthesis inhibitors included chlorfluazuron, hexaflumuron, and lufenuron against the 6th instar larvae of R. ferruginous
Summary
Received:28/3/2020 pest, red palm weevil (Rhynchophorus ferrugineus), raises the question. Some biochemical changed in the 6th instar larvae after weevil, Rhynchophorus ferrugineus, chlorfluazuron, hexaflumuron, lufenuron, LC50, food dipping, treatment with tested LC50s were measured. The LC50 values of chlorfluazuron, hexaflumuron, and lufenuron were determined at 454.01,1293.02 and 919.13 μg/ml, respectively for the 6th larval instar exposed using the food dipping method. The lufenuron showed the lowest significant reduction in total protein (7.29%) accompanied with activation GST, ß-esterase, carboxylesterase, phenoloxidase, chitinase, and ɑEsterase recorded 58.50, 58.54, 26.09, 22.56, 11.52 and 7.77% increasing respectively. The chlorfluazuron showed mediated significant reduction in protein, total protein (23.54%) accompanied with activation GST, ß-esterase and carbohydrates, carboxylesterase and chitinase recorded 24.90, 23.94, 4.89 and 2.28 %. The highest significant reduction in total protein (45.96%) with hexaflumuron treatment accompanied with activation GST, carboxylesterase and chitinase recorded 48.02, 38.86 and 25.22% increase respectively
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