![]() This enzyme is most active in young meristematic tissue, so symptoms are found at the growing points of susceptible plants. Group 2 herbicides inhibit the production of branched-chain amino acids by targeting the acetolactate synthase (ALS) enzyme.These herbicides move systemically through the xylem and phloem in the plant. Group 2 herbicides can enter the plant through the roots (soil uptake) or can be absorbed through the leaves (foliar uptake).Common active ingredients include imazamox, imazethapyr, imazapyr, flucarbazone sodium, metsulfuron-methyl, thifensulfuron-methyl, tribenuron-methyl, florasulam, pyroxsulam, and thiencarbazone-methyl.Refer to Environmental Stresses in Pulses for more information.Ĭareful examination of the above and below-ground symptoms as well as detailed collection and analysis of all cropping information must be considered before determining the cause of an unhealthy plant. ![]() Symptoms of herbicide injury can be confused with symptoms caused by environmental or physiological stress on the plant such as frost, hail, or wind damage, excessive moisture, drought, heat stress, plant diseases, nutrient deficiency or toxicity, and fertilizer burn. Herbicide injury can result from herbicide drift, herbicide carryover in the soil, residual herbicides used at incorrect rates or on improper soil types, contamination of the sprayer tank or nozzle components, miscalibration of sprayer equipment, or sprayer overlap. Pulse crops can be very sensitive in their susceptibility to herbicides.
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