Case Details
Romano beans herbicide injury
Submitted by Kenneth R. Williams on 6/24/2006
Chris - please contact Jed Colquhuon as he talked to the grower. Field of romano beans sprayed on May 30 showing herbicide damage, stunting, bulby roots, some death of plants, volunteer potatoes in field show leaf epinasty, cupping and curling. Sides of field and spray around irrigator wheels show effects of herbicide so with near certainty injury is from weed spray. Beans off ends of boom on side of field are significantly taller. Coop sprayed spring oats with banvel and 2,4-D just prior to this field. White ruler is 12" with 1" in ground, Grey ruler is 15" with 1" in ground. Field was supposed to be sprayed with Cinch and Sandea.
Reply by Chris M. Boerboom on 6/28/2006
With confirmation from Jed Colquhoun, the situation is Banvel (dicamba) tank contamination, which provided soil residual activity on the snap beans when the field was sprayed preemergence. In this case, you see the foliar symptoms of the growth regulator (leaf deformities, stem twisting or epinasty, plus the root pruning. The pruned roots can get even more snubbed off than the ones shown here, with short, fat knobby roots. Dicamba doesn't have long residual activity so it rarely would carryover to the next season (unless applied at high rates), but it has enough residual to affect a sensitive crop germinating soon after application.
