In the past, Thai farmers have never heard the term until the chemical officer, Ministry of agriculture, into the villages suggested that farmers know pesticides from abroad or locals called "insecticides.
Thailand in the past, farmers had never heard of the chemical until the Ministry of Agriculture through the village farmers to recognize chemical pesticides from abroad. Or people called "insecticides.
In the past the peasant never heard until the Ministry of agriculture chemical agent into the village guide farmers to pesticides from abroad. Or people called "pesticide.