PJB-2023-512
INVESTIGATING THE REPELLENT AND FUMIGANT PROPERTIES OF ROSA DAMASCENA AND PANDANUS TECTORIUS AGAINST SITOPHILUS ORYZAE (RICE WEEVIL) LARVAE AND ADULTS (COLEOPTERA: CURCULIONIDAE)
Somia Sharawi
Abstract
This study delves into the effectiveness of extracts from Rosa damascena (R. damascena) and Pandanus tectorius (P. tectorius) against both adult and larval stages of Sitophilus oryzae (S. oryzae) after a 24-hour exposure period, utilizing various extraction methods. The results indicated that R. damascena consistently outperformed P. tectorius in terms of both repellency and fumigant activities, regardless of the extraction method used. Specifically, the hydro-distillation method exhibited the highest efficacy for R. damascena, resulting in potent repellency (RC50: 5.7, RC90: 93.2) and high mortality (LC50: 11.7, LC90: 114.6) against larvae and adults of S. oryzae, respectively. In contrast, P. tectorius demonstrated lower repellency and fumigant effects across all methods and stages. However, the solvent-free microwave-assisted method enhanced its activity, particularly against larvae (RC50: 10.8, RC90: 193.3; LC50: 27.2, LC90: 815.2). These findings underscore the significance of extraction techniques, with hydro-distillation proving pivotal in maximizing the efficacy of both plants. This study emphasizes R. damascena's potential as a natural pesticide, highlighting its effectiveness in pest control applications. These results offer valuable insights for agricultural practices, paving the way for the development of eco-friendly pest management strategies in stored agricultural products.
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