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How to Identify and Control Two Spotted Spider Mites on Cannabis Plants Professor DeBacco Two Spotted Spider Mites Description Two-spotted spider mite, Tetranychus urticae, is a type of arachnid, related to insects. They are very tiny, about 1/50th of an inch long. Yellow-orange in color, with two dark spots, one on each side of the body. When a heavy infestation occurs webbing on plants will also be present, which a water mist can help visualize. Two Spotted Spider Mites Identification on Plant Webbing occurs when high numbers become established Goal is to first identify them when the leaf flecking initially occurs Positive ID may require a 30x loupe Also shaking leaves over a piece of clean cardboard can help you detect their presence. Managing Two Spotted Spider Mites Certain species of lady beetles (e.g. Stethorus sp.) and predatory mites (e.g., Phytoseiulus persimilis) naturally control two spotted spider mite populations when present in low numbers. Using long-lasting pesticides like bifenthrin and permethrin kill natural enemies and should be avoided to encourage natural enemies. If using soaps and horticultural oils that show some effectives to ensure greatest efficiency be sure to apply them to the undersides of the leaves well (and also the upper sides) and make repeated applications if needed. Link to Lecture Slides: https://drive.google.com/file/d/1W_Q9... *Due to the description character limit the full work cited for "How to Identify and Control Two Spotted Spider Mites on Cannabis Plants" can be viewed at... https://drive.google.com/file/d/1fhV0...