Insecticidal Impact of some Natural Oils and their Nano -Emulsions on Sitophileus oryzae

Document Type : Original Article

Authors

1 Plant Protection Dept. (Pesticides), Fac. of Agric., Tanta Univ. Egypt

2 Plant Protection Res. Inst., Agric. Res. Center, Dokki, Giza, Egypt

Abstract

In vitro studies were conducted to evaluate the effects of essential oils (EOs), Cymbopogon citratus, Syzygium aromaticum and their nano-emulsion (NEs) by mixing with grains against Sitophilus oryzae (L.). Malathion was used as a standard reference and had the highest adverse effect among those followed by NEs and EOs, since % mortality, % reduction of progeny S. oryzae adults raised,and % loss of wheat grains decreased with high concentration and time. Malathion has a highly toxic effect, followed by NEs and EOs, where the LC50 values of malathion, S. aromaticum nano-emulsion, C. citratus nano-emulsion, S. aromaticum oil and C. citratus oil were (835.6 & 277.0), (15166.4 & 9516.3), (18817.0 & 13333.4), (17232.7 & 10371.5) and (45342.6 & 15706.1) after one and two weeks, respectively. The mortality rate for malathion was 95%, followed by the nano-emulsions S. aromaticum and C. citratus (83.3 and 70.0%) and EOs (76.7 and 66.0%), respectively. While the percentage of reduction in progeny at the high concentration of malathion was 93.5, and was 94.6 and 76.6% for NEs, and 91.8 and 83.7% for EOs, respectively. Moreover, Malathion had the lowest percentage of wheat grain weight loss, followed by NEs and EOs, compared to the untreated control (29%). Furthermore, NEs have a lower percentage of germination wheat grains. Finally, the use of NEs is a promising eco-friendly tool for the control of S. oryzae .

Keywords

Journal of Plant Protection and Pathology
Volume 14, Issue 12
December 2023
Pages 379-385

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