See:
Greenhouse Plants, Ornamental - Impatiens Necrotic Spot
Symptoms Brown lines occur in concentric patterns around or near the petiole.
Close up of African Violet flower with western flower thrips in the lower left corner.
Stacey Fisher, 1991.
See:
Greenhouse Plants, Ornamental - Impatiens Necrotic Spot
Symptoms Brown lines occur in concentric patterns around or near the petiole.