The old man herding sheep has been eating vegetables and precious varieties of Chinese rose in my vegetable field!

Go to the pesticide store to buy some strong-smelling pesticides (omethoate, chlorpyrifos, etc. ), hit them on the edge of the ground with high concentration, and hang warning signs on the edge of the ground ("If you hit highly toxic pesticides on the ground, you will bear the consequences", etc. The important thing is to make him afraid to raise them to harm the vegetable field after smelling them, instead of killing the sheep.