Leaves of Aegle marmelos Correa (Rutaceae) were extracted successfully with methanol (95%), ethyl alcohol (50 and 95%). These extracts were tested for their toxicity against eggs, larvae, protonymphs, deutonymphs and adults of Oligonychus coffeae (Nietner) (Tetranychidae: Acari) under laboratory conditions. In general, methanol extract was the most potent in terms of acaricidal activities against all life stages, followed by 95% ethyl alcohol and 50% ethyl alcohol extracts. The effect was stronger with increasing concentrations. The methanol extract effectively and significantly reduced the mite population in field trial, and its efficacy was comparable to synthetic pesticides and neem pesticides. With the availability and distribution of A. marmelos in and around tea growing areas of northeastern India, A. marmelos should be further developed as a potential plant-based acaricide for effective management of tea red spider mite.

中文翻译：

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Aegle marmelos Correa（芸香科）的叶子：用于管理咖啡寡爪螨（Nietner）（Acari：Tetranychidae）的潜在杀螨剂来源

用甲醇 (95%)、乙醇 (50% 和 95%) 成功提取了 Aegle marmelos Correa (芸香科) 的叶子。在实验室条件下测试了这些提取物对咖啡寡爪螨 (Nietner) (叶螨科：Acari) 的卵、幼虫、原若虫、次若虫和成虫的毒性。一般来说，就所有生命阶段的杀螨活性而言，甲醇提取物最有效，其次是 95% 乙醇和 50% 乙醇提取物。随着浓度的增加，效果更强。甲醇提取物在田间试验中有效且显着地减少了螨的数量，其药效可与合成农药和印楝农药相媲美。随着 A. marmelos 在印度东北部茶叶种植区及其周边地区的可用性和分布，A.