Cotton leafroll dwarf virus (CLRDV) — the causal agent of cotton blue disease — has been confirmed on research stations in Alabama. The aphid-transmitted disease has been monitored since 2017.

CLRDV symptoms include stunting/dwarfing; compacted terminal growth; upward-cupped leaves; red discoloration of petioles and stems; distorted growth with yellowing around leaf edges; and crinkled leaves.

Extension and university researchers are requesting sample submissions. A form with sampling directions, accessed at aces.edu, should accompany submissions.

The data will help researchers better understand the development and distribution of the disease.