TYPES, VARIETIES & CUTS
One of the more popular herbs used as garnish is parsley, of which three types are grown in the United States: curled-leaf, a bright green variety that grows 8 to 14 inches tall; the stronger-flavored and hearty flat-leafed or Italian, which can grow up to three feet tall; and turnip-rooted, with flat leaves, which is often used for its root and cooked as a vegetable.
References: Herb Society of America, Ohio State University Extension, University of California- Davis, University of Minnesota Extension, Worldcrops.org
PESTS & DISEASE
Alternaria leaf spot infections begin with the appearance of small brown flecks on parsley leaflets. Lesions may develop yellow halos as they expand in size and number.
With damping-off, seedlings may die at random or in rapidly lengthening sections of freshly seeded rows. Lesions may be observed well up on the petioles as well as at the soil line.
Initial symptoms of root rots are the progressive yellowing and browning of older, lower leaves. Ultimately, the entire plant may turn yellow, then necrotic, and die. Longitudinal, reddish cankers frequently develop on the taproots.
With septoria leaf spot, lesions appear as sunken brown foliar spots with gray centers. As lesions age, minute black specks distinguish Septoria leaf spot from alternaria leaf spot.