Shown below is a problem we see at least some of every year. It requires looking at both the roots and the panicle to determine the cause. We determined this to be 2,4-D injury caused not by incorrect timing, but because the herbicide was applied to a field with too little water to protect the crown of the plant. Another clue was greater injury to the tillers than to the main stalks which again points to the crown being hit by the herbicide. Uptake resulted in the formation of odd shaped adventitious roots and panicles emerging from the side of the flag leaf sheath. Some of these had significant enough damage to reduce seed formation; however most of the panicles were flowering normally in spite of the irregular exsertion. Even though 2,4-D is considered a broadleaf herbicide it can and does affect grasses like rice. I have seen similar injury on both corn and grain sorghum when 2,4-D was used over the top on them. How much yield might be affected will depend on how extensive the problem is throughout the field.