Wheat Herbicide Selection Guide

This solution identifies the correct post-emergence herbicides used for controlling broad-leaved weeds specifically in wheat crops.

Analysis of Herbicide Options:

• Option A: 2,4-DB - This is a selective, post-emergence herbicide effective against many broad-leaved weeds. It is commonly used in cereal crops like wheat.
• Option B: Metsulfuron-methyl - A sulfonylurea herbicide used post-emergence for controlling broad-leaved weeds in wheat and other cereals.
• Option C: Clodinafop-propargyl - This herbicide is used post-emergence in wheat, but it targets grass weeds, not broad-leaved weeds.
• Option D: Pendimethalin - This is a pre-emergence herbicide, applied before weeds germinate. It is not suitable for post-emergence broad-leaved weed control in this context.

Conclusion:

Based on the analysis, both 2,4-DB (A) and Metsulfuron-methyl (B) are suitable post-emergence herbicides for controlling broad-leaved weeds in wheat crops. Clodinafop-propargyl targets grasses, and Pendimethalin is a pre-emergence herbicide.

Therefore, the correct combination is A and B only.