Identification

• Hemp russet mites are very small and cannot be seen without magnification.
• Their appearance is marked by a long, cylindrical beige body and two pairs of legs.
• To date, they have only been found on cannabis plants.
• These mites are only able to crawl short distances.
• They can spread via wind, infested cuttings, or on people or supplies.

Damage

• The mites feed on the outer layer of leaves, stems, or flowers.
• Symptoms include leaf upward curling, dull appearance, plant yellowing or browning, brittle leaves, and leaf or plant death.
• Heavily infested plants may have yellow buds.
• Mite damage can reduce both quality and yield.
• Indoor and outdoor hemp plants are at risk.

Management

• Early detection is key. Use a hand lens to routinely scout several areas of the field or greenhouse.
• Inspect and disinfect cuttings before planting.
• Little research is available on effective chemical or biological controls.
• Use the Farming Basics Mobile App to locate Alabama Extension personnel for questions.