Russet Hemp Mite Control

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How to Get Rid of Hemp Russet Mites Naturally The hemp russet mite ( Aculops cannabicola ) is widely recognized as one of the most damaging pests of cannabis and industrial hemp cultivation. You can’t easily manage hemp russet mite (HRM) because you can’t see it without magnification. Its damage mimics nutrient deficiencies and physiological disorders that delay recognition. Its populations can exceed 1,000 mites per leaf before visible symptoms appear on the plant. By the time most growers notice a russet mite problem, it is already a serious infestation. The only effective strategy is a preventative, integrated approach. Rigorous scouting, sanitation protocols, preventative predatory mite releases before mite populations establish, and targeted organic treatments are effective. What Are Hemp Russet Mites? The hemp russet mite is a member of the family Eriophyidae. This family contains many important crop pests including the tomato russet mite, citrus rust mite, and grape erineum mite. The hemp russet mite species has a host range limited to Cannabis sativa . Laboratory studies have been unable to establish HRM on other plants in the Cannabaceae family (NC State Extension, 2020). This host specificity makes cannabis and hemp the sole cultivated hosts of concern. Identification Hemp russet mites are extremely small, about half the width of a human hair, and the naked eye cannot see them. They have elongated bodies that taper at the rear and are pale yellow, pink, or cream in color. They have four legs located near the front (unlike spider mites, which have eight). They do not produce webbing, making them harder to identify. These mites typically gather on the undersides of leaves and on new growth tips, where they feed on young plant tissue. In heavy infestations, you can also find them on stems and buds, where they appear like slow-moving, dust-like clusters. Signs of Hemp Russet Mite Infestation Early symptoms (often misidentified as nutrient deficiency): 'Canoein