What are the symptoms of simetryn herbicide damage?

Simetryn is suitable for controlling weeds such as barnyardgrass, needle spikerush, pondweed, water plantain, wild arrowhead, Lindernia, and small arrowhead in paddy fields, and can also be used for weed control in corn, soybean, wheat, peanut, cotton and other crop fields. So, what do the symptoms of simetryn herbicide damage look like?

1. What do the symptoms of simetryn herbicide damage look like?

Simetryn does not hinder germination and emergence; the symptoms of herbicide damage occur only on the cotyledons that have grown out, spreading from yellowing at the leaf tip to the leaf margins. Broadleaf weeds may develop interveinal yellowing (chlorosis). Because older leaves and larger leaves absorb more of the spray solution, they are damaged first and eventually turn brown and die.

2. How to use simetryn

1. Use in paddy fields

To control pondweed, 15-20 days after rice transplanting, or in direct-seeded fields at the late tillering stage, when pondweed is at its peak occurrence and most leaves have turned from red to green, use 100-200 g of 25% wettable powder per mu, mix with about 20 kg of fine moist soil, and broadcast evenly. When applying, the water layer should be 2-5 cm and maintained for 5-7 days; it can also control barnyardgrass before the 2-leaf stage and broadleaf weeds. In Northeast China and eastern Inner Mongolia, from early June to late July, use 200-250 g of 25% wettable powder per mu; in North China, use 133-150 g per mu; in South China, use 100-150 g per mu.

2. Use in dryland

After crop sowing and before emergence, use 150-500 g of 25% wettable powder per mu, dilute in 40 kg of water, and spray evenly over the soil surface.

3. Precautions for using simetryn

1. The temperature at application should be below 30°C; above 30°C herbicide damage is prone to occur, so it is mainly used in the north.

2. During use, try to ensure the land is level and the application is uniform. Do not use it on low-lying, poorly drained land, sandy soil with low organic matter content, or strongly alkaline or strongly acidic soil, as herbicide damage is prone to occur.

To improve safety to rice and broaden the weed control spectrum, simetryn is usually mixed with thiobencarb and butachlor.