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Plant NameTypeDescription 
Leaf spotCarrotDiseaseLeaf spot of carrot is also known as early blight. It is a fungal disease. The disease produces leaf and stem spots, primarily attacking young leaves. Initially the spots are small, with yellow halos or margins. Older lesions may become tan or light gray as the fungus produces spores on the infected tissues. Severe infections may result in death of leaves. Disease spores can be spread by wind. The fungus primarily overwinters in diseased plant material. Leaf spot may be confused with leaf blight, which generally attacks older foliage.
Root-knot nematodeCarrotDiseaseNematodes are microscopic, parasitic worms that live in the soil and in infected plant parts. Carrot roots attacked by root-knot nematodes are stunted, may have many short, bushy side roots, and are generally lumpy or otherwise distorted. The tops of infected carrots may be stunted, yellow, or show other signs of water stress or root damage. Plantings typically show symptoms first in circular patches, which can increase in size each season.
Carrot rust flyCarrotInsectThe carrot rust fly adult is about 1/4" long. The flies are shiny and dark green in color with yellow legs and heads. Females lay eggs around the crowns of host plants, which include carrots, celery, dill, parsley, and related weed species (family Umbelliferae). Upon hatching, the maggots burrow into the roots, where they tunnel in the surface tissues. Tunnels are filled with rust-colored frass (excrement). Larvae may also feed on small fibrous roots. Damaged plants often appear yellow and stunted above ground and may die. Mature larvae are up to 1/3" in length and yellowish to tan in color. The carrot rust fly pupae can overwinter in infested roots or in the soil.