Can prometryn be used for post-emergence weed control?

Yes. Prometryn, also known as prometryne and "cut-grass good," belongs to the triazine class of selective systemic conductive herbicides. It can control annual and some perennial malignant weeds, such as crabgrass, Chinese sprangletop, wild amaranth, Polygonum, lambsquarters, purslane, goosegrass, foxtail, barnyardgrass, shortawn foxtail, and others, killing weeds by inhibiting their photosynthesis. It is low in toxicity to humans and livestock, and toxic to fish. The formulations are 50% and 80% wettable powders.

How to use: For weed control in vegetable fields, it is mainly suitable for crops such as carrots, celery, garlic, onions, Chinese chives, and mustard. After sowing and before emergence, or during the seedling stage, use 100 grams of 50% wettable powder per mu (666.7 sq m), mixed with 40 kg of water, and spray evenly. Alternatively, mix 50 grams of 50% wettable powder with 20 grams of 25% nitrofen wettable powder per mu (666.7 sq m), then mix with water and spray; the effect is better than using prometryn alone.

Note: Do not use it in sandy soil with low organic matter content, to prevent herbicide damage.