Herbicide Symptoms - Part 1 (ACIS)

Herbicide Symptom Key

Cell division inhibitors - These herbicides cause spindle malfunctions in mitosis and disrupt cell division. Normal cell wall formation and lateral root development are also affected.

Injury Symptoms: General symptoms include stunted plants with abnormally thick, short roots with swelled root tips. Injured plants may not emerge at all or do not fully emerge. Grass shoots are short and thick and may appear red or purple in color. Broadleaf plants may have swollen and cracked hypocotyls. Tolerant species, typically large seeded species, emerge and are temporarily stunted due to slow root development.

Dinitroaniline herbicides - absorbed by roots and coleoptiles

benefin – Balan
oryzalin - Surflan
pendimethalin – Prowl

Photo of corn roots affected by Prowl. Copyright University of Minnesota.
©University of Minnesota - Corn roots affected by Prowl

Photo of a field plot with morningglory, grasses, purslane with their control with Prowl.
(Morningglory, grasses and purslane control at 2x use rate - Prowl)

trifluralin – Treflan

Pyridine herbicides - absorbed by roots and coleoptiles

dithiopyr – Dimension
thiazopyr – Visor

Others - absorbed by roots, active in roots, limited mobility

pronamide – Kerb

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Because labels are subject to frequent change, always consult the label attached to the product before using any pesticide. The user must assume responsibility for proper application and for residues on crops as well as for damage or injury caused by pesticides, whether to crop, person or property.

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