Browsing by Author "Gavilanes Gavilanes, Cristian Rafael"

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    Efecto del extracto etanólico de Annona cherimola en el control de Oligonychus coffeae (NIETNER, 1861) (ACARI: TETRANYCHIDAE)
    (2017) Gavilanes Gavilanes, Cristian Rafael; Vásquez, Carlos
    Oligonychus coffeae (Nietner) is considered an economic importance pest in coffee trees and other crops from tropical and subtropical regions so that constant methods of control are required. In this study, the acaricidal effect of different extract doses obtained from leaf and seed of Annona cherimola (625, 1250, 2500, 5000 and 10000 mL/L) on mortality rate, oviposition rate and fecundity in O. coffeae females under laboratory conditions. The effectiveness of extracts was evaluated using the residual contact technique in rearing units using coffee leaf discs. Mortality, oviposition and fecundity of O. coffeae females were affected by type and concentration of extract. Highest mortality rate was achieved with the application of seed extract. Additionally, it caused oviposition decrease by 46.7 or 82.5% with the seed extract at 625 mL/L and 10,000 mL/L, respectively, while the leaf extract, decreasing varied from 29.9 to 62.0% at 625 and 10000 mL/L. Seed extract was also more effective in reducing the fecundity of O. coffeae females (28.9 eggs/female), as compared to females treated with leaf extract (36.1 eggs/female). The results showed that cherimoya could be a sustainable alternative for the management of O. coffeae populations in coffee plantations, however field studies are suggested to validate laboratory studies.