In recent months, Saigon Plant Protection Joint Stock Company has received many feedback letters from fellow farmers in the Mekong River Delta stating that Cyperus difformis , Fimbristylis miliacea   is difficult to remove, even though it has been sprayed. products, but this weed still exists in the field and asked the company to explain the reason as well as introduce to people what products can eliminate weeds in rice fields, especially Cyperus difformis , Fimbristylis miliacea  etc. but still safe for rice.