There is only a minority of farmers. Can determine whether the virus that causes the symptoms of a particular disease. India farmers with knowledge about the virus, Thailand and Viet Nam, rather than farmers plant.
Only a minority of farmers Can determine whether a virus causes the symptoms of a specific disease. Indian farmers have more knowledge about the virus crop farmers, Thailand and Vietnam.
Only a small proportion of farmers. Can specify that the virus that caused the symptoms of specific diseases. Indian farmers knowledge of plant virus more farmers and Vietnam