Yield may be reduced if exposure is prolonged or occurs during early reproductive stages of growth. Sensitivity varies among soybean cultivars. Symptom development may be chronic from exposure to low levels over a long period, or acute following a brief exposure to high levels of the pollutant. Chronic symptoms consist of leaf chlorosis occurring between veins. Veins of severely affected leaves also become necrotic and leaves often drop prematurely.
Symptoms often appear on both leaf surfaces.
The proximity of affected fields to a point source of the pollutant, and air quality data are useful for diagnosis. 34 Dinitroaniline Herbicides Dinitroaniline herbicides include many common preemergence herbicides such as Treflan, and Prowl. Injury usually occurs when rates that exceed the label are used. Dinitroaniline injury is often temporary and is not economically important, unless stands are reduced. Symptoms include delayed emergence and some stunting under cool, wet soil conditions.