EFFECT OF ETHANOLIC EXTRACTS OF Annona cherimola ON CONTROL OF Oligonychus coffeae (Nietner) (Acari: Tetranychidae)

Abstract

In this study, the acaricidal effect of leaf and seed extract doses from Annona cherimola (625, 1250, 2500, 5000 and 10000 mg/L) on mortality rate, oviposition rate and fecundity in O. coffeae females were evaluated 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 extracts. Additionally, it caused oviposition decrease by 46.7 or 82.5% mainly with the seed extract at 625 and 10,000 mg/L, respectively, while the leaf extract, decreasing varied from 29.9 to 62.0% at the same concentrations. Seed extract was also more effective by 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.