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How to Identify and Control Gnats on Cannabis Plants Professor DeBacco Fungus Gnats Description Fungus gnat larvae need wet conditions to thrive and are typically found in growing substrates. Fungus Gnats Identification Yellow sticky cards can be helpful to early detection, however you can also use sliced potatoes placed in the soil/substrate as it should only take about 4-8 hours for maggots (if present) to find the potatoes. This is because these insects can feed on the roots of cannabis plants. Managing Fungus Gnats A wet substrate surface is key to their proliferation so sometimes putting a layer of sand or rice hulls on the surface of a containers substrate, will reduce surface moisture and result in less gnats. In general keeping the substate surface dry is important for their control. Some suggest applications of Bacillus thuringiensis (Bt) can be helpful. Last resort should be insecticides that contain pyrethrum and neem oil as these need several soil based applications and can damage plant roots. Link to Lecture Slides: https://drive.google.com/file/d/1fFVR... *Due to the description character limit the full work cited for "How to Identify and Control Gnats on Cannabis Plants" can be viewed at... https://drive.google.com/file/d/172qV...