This paper is to discuss the problem on strengthening the concept, system comprehenoive control of diseases, insects and weeds pests of crops.

As the larval cestodes is highly pathogenic to human,it is important for diagnosis of larval cestode infections.

Analysis between marine molluscs and its infected larval trematodes from Hong Kong;

For making the new technique much more efficiency in the application,the advantages and disadvantages of prevention technique of adult insects were analyzed.