Can pendimethalin be used in watermelon fields?

It cannot be used, because watermelon is sensitive to pendimethalin, and use can easily cause herbicide damage, so it is not recommended. Pendimethalin is a selective soil-applied pre-emergence herbicide. After sowing watermelon, pendimethalin is sprayed for pre-emergence treatment, and then the field is covered with plastic film. As daytime temperatures rise, pendimethalin volatilizes onto the film, and at night it condenses again into small droplets that fall onto the soil surface, just when the germinating watermelon sprouts are there, causing watermelon poisoning.

Pendimethalin belongs to the aniline class of herbicides. The pure product is an orange-yellow crystalline solid with a melting point of 54-58°C, solubility at 25°C of 0.275 mg/L in water, and it is easily soluble in organic solvents such as acetone, methanol and xylene. It is an excellent selective herbicide for dryland crops and can be widely used for weed control in fields of corn, soybean, peanut, cotton, direct-seeded upland rice, potato, tobacco, vegetables and many other crops.