Atrazine which is not labeled for use in soybeans, kills soybeans often as a result of residual herbicide from previous crops. Although labeled for soybean use, metribuzin injury occurs when application is made at rates exceeding the label or when applied to sensitive cultivars. Injury may also occur from herbicide being concentrated in low areas following heavy rains. Injury results from improper application within the field, but may also result from herbicide drift from surrounding fields. Soybeans are more sensitive to phenoxy injury when they are in a rapidly growing vegetative state.
Damage resembles that of phenoxy herbicides.
Leaflets are cupped upward, crinkled, and may exhibit a pronounced tip at the apex. Other Injury Fig. 38 Lightning Damage Lightning kills or injures soybean plants in a circular pattern within the field. The affected area does not expand over time. Few plants or weeds within the circle survive, but plants near the edges may show only slight injury.