Abstract:
The rice weevil, Sitophilus oryzae Linnaeus is one of the most important pests in stored rice. Since rice is a crucial staple food with seasonal availability, ensuring a continuous supply for consumers is essential. Therefore, it is imperative to protect against pest infestations during storage. In order to find efficacy of methanol leaf extracts of Nishinda, Vitex negundo on development of ovary of rice weevil Sitophilus oryzae (L.), methanol leaf extracts of V.negundo prepared at laboratory and tested at three concentrations of 0.025g/ml, 0.075g/ml, and 0.125g/ml along with solvent control and untreated control by measuring the length of germerium, vitellarium and ovariole. Methanol leaf extract of V.negundo at 0.125g/ml significantly (P<0.05) reduced the lengths of gemarium, vitellarium, and ovariole than that of controls as a result fecundity of S. oryzae is reduced. This study revealed that high concentration of (0.125g/ml) V.negundo found as most effective in reduction in the development of the ovary by reduction of length of gemerium, vitellarium and ovariole. Thereby it leads to a reduction in fecundity of S.oryzae and V. negundo plant can be considered as a potential pesticidal plant for control the pest.
