AMINO ACID INHIBITORS

Family: Imidazolinone

Example: Imazethapyr (Pursuit), imazaquin (Scepter) and imazamox (Rapture)

Family: Sulfonylurea

Example: Chlorimuron (Classic), chlorsulfuron (Glean), metsulfuron (Ally),
nicosulfuron (Accent), and triasulfuron (Amber)

Crop Use: Corn, soybean, small grains, grass pasture, and CRP

Movement: Throughout plant

Injury by Sulfonylurea carryover -- tuber

Potato Injury: Foliar symptoms include a light green appearance of leaves especially new ones. Leaves are cupped upward giving a "boat-shaped" appearance. There may be a loss of leaf blade integrity; leaf disintegrates leaving the mid-rib and about 10% of a normal leaf. Rolling of the leaves may occur resembling drought stress. Severe injury results in stunting and purpling. Tuber yield and quality are greatly reduced.

TUBER SYMPTOMS ASSOCIATED WITH HERBICIDE INJURY
Tuber mis-shaping include longitudinal cracks, "dumb-bells," curved or folded tubers, indentations, and knobs, bumps or protrusions. Tubers are often under-sized. The skin may develop "alligator hide." Severe injury may cause tuber "chaining" and formation of "popcorn" tubers. Aerial tubers have also been observed.

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