Assessment of Gluta renghas L. and Mangifera indica L. (Sapindales: Anacardiaceae) extracts on the sublethal effects of dengue vector

Botanical extracts are one of the effective alternative methods for controlling dengue vectors. Methanolic extracts of Gluta renghas Linnaeus and Mangifera indica Linnaeus were assessed under the field condition for substantial lethal and in the laboratory for sublethal effects on dengue vectors in different seasons (dry and wet), and conditions (shaded and unshaded). The effectiveness of these plant extracts was evaluated for the Aedes mosquitoes on the number of eggs, percentage survival of adults, development days to reach adulthood, the number of eggs laid by F1 generation and percentage of hatchability. Significant differences were observed for the number of eggs in both the conditions and weeks of collection (P < 0.005) with the least number of eggs recorded by the Mn. indica stem treatment in the dry season. Whereas, GL renghas leave extract had the lowest percentage (33.51 +/- 2.75%) of surviving adults under the dry shaded conditions. Significant effects were noticed for both conditions and weeks on the percentage of Aedes survived adults and the time to take to reach adulthood (P < 0.005) during both seasons. Mangifera indica stem treatment was observed caused prolong in time for emergence to adult stage in dry unshaded conditions (12.42 +/- 029 days) and significantly reduced the fecundity of the Fl generations in both seasons (P < 0.005) with less hatching percentage at 55.67 +/- 4.24% during wet shaded conditions. Overall, both plant extracts performed effectively and better than Abate to control Aedes population in the dry season. It can be concluded, that both plant extracts are potential candidates for alternative source of biolarvicides. (C) 2016 Korean Society of Applied Entomology, Taiwan Entomological Society and Malaysian Plant Protection Society. Published by Elsevier B.V. All rights reserved.