Hemp russet mite, Aculops cannibicola Farkas (Acari: Eriophyidae), is one of the key pests of hemp, Cannabis sativa L. (Rosales: Cannabaceae). Hemp russet mite feeds primarily on new growth and can reach high densities, frequently exceeding a thousand mites per leaf, and leading to a decrease in yield and quality of cannabinoids. The objective of this experiment was to determine the efficacy of reduced-risk pesticides used in organic crop protection as well as conventional insecticides in managing hemp russet mites in a greenhouse and field. Hemp (var. Unicorn) was exposed to leaves heavily infested with hemp russet mites, and once mite densities reached an average of 50 mites per leaf, the following insecticides were applied to the plants: abamectin, etoxazole, fenpyroximate, rosemary oil, and 2 concentrations of a mineral oil. An application of sulfur was also included in the field experiment. Treatments were replicated 9 times in the greenhouse and 6 times in the field. Each of the pesticides significantly reduced hemp russet mite densities in the greenhouse, with all treatments resulting in significant decrease in mite populations 10 days after the initial treatment that persisted until the end of the experiment. On the other hand, only fenpyroximate, sulfur, and rosemary oil provided strong and effective suppression of the mites in the field. This is the first study to test these products against hemp russet mites in hemp, and our outcomes indicate that several pesticides available for organic crop production can provide effective control of the pest.

中文翻译：

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温室和田间工业大麻中对大麻赤螨、Aculops cannabicola（螨虫：Eriophyidae）的抑制

大麻赤螨（Aculops cannibicola Farkas）（蜱螨亚纲：Eriophyidae）是大麻（Cannabis sativa L.）（蔷薇科：大麻科）的主要害虫之一。大麻赤螨主要以新生长的植物为食，密度很高，每片叶子往往超过一千只螨，导致大麻素的产量和质量下降。该实验的目的是确定有机作物保护中使用的低风险农药以及传统杀虫剂在温室和田间管理大麻赤螨方面的功效。将大麻（独角兽变种）暴露于严重感染大麻赤螨的叶子上，一旦螨虫密度达到每片叶子平均 50 只螨虫，就对植物施用以下杀虫剂：阿维菌素、乙螨唑、吡螨酯、迷迭香油和 2矿物油的浓度。现场实验还包括硫的应用。处理在温室中重复9次，在田间重复6次。每种杀虫剂均显着降低了温室中的大麻赤螨密度，所有处理均导致初次处理后 10 天螨虫数量显着减少，这种情况一直持续到实验结束。另一方面，只有吡螨酯、硫磺和迷迭香油对田间的螨虫具有强烈而有效的抑制作用。这是第一项针对大麻中的大麻赤螨测试这些产品的研究，我们的结果表明，几种可用于有机作物生产的农药可以有效控制害虫。