The lesions are, on average, less than half an inch in diameter and appear near harvest, but can grow as the carrot matures and grow larger on processing varieties of carrots. Low density hyphae are present in early formation of the lesions, but there is little to no presence of Pythium violae spores in the mature lesions making it difficult to diagnose in the field.
The lesions are generally smaller than half an inch in diameter and appear close to harvest; however, they can increase in size as the carrot matures and grows larger on specific varieties of carrots. Initially, there is a low density of fungal hyphae present, whereas Pythium violae spores are scarce or absent in mature lesions, making it difficult to diagnose.