The epidemic law and control of citrus root rot disease in the district of Shaoyang, Hunan were studied.
To learn the epidemic law of virus hepatitis in Dongli District since 1990 to 2004 and provide scientific basis for the work of prevention.
The epidemic law and control of citrus root rot disease in the district of Shaoyang, Hunan were studied.
To learn the epidemic law of virus hepatitis in Dongli District since 1990 to 2004 and provide scientific basis for the work of prevention.