Symptoms of A. dauci appear first as greenish-brown, then water-soaked, and finally necrotic lesions 8–10 days following an infection event. These lesions will appear on carrot leaflets and petioles, and have a characteristic chlorotic, yellow halo. The lesions can be irregularly shaped, and will often appear on older leaves first.
Lesions caused by A. dauci typically begin as greenish-brown, then become waterlogged, and eventually turn necrotic 8–10 days after the initial infection. These lesions will appear on carrot leaflets and petioles, surrounded by a characteristic yellowish discoloration. The lesions can be irregularly shaped and often first develop on older leaves.