【Abstract】 Objective To study the control effect of cashew nut shell liquid（CNSL） and anacardic acid from CNSL to Oncomelania  hupensis,  and provide  the basis  for  the  application of CNSL.  Methods The  mixture of anacardic acid was obtained by separating extracts by silica gel column. The  molluscicidal  activities  of  CNSL  and  the  mixture  of  anacardic acid against O.hupensis were tested according to laboratory molluscicidal test method recommended by WHO. Results The purity  of anacardic acid extracted by silica gel column was 89.32%. The LC₅₀ values of CNSL and anacardic acid mixture to snails were 0.831 mg/L and 0.523 mg/L after treatment for 48 hours, and the LC₉₀ values were 2.180 mg/L and 1.439 mg/L respectively. The inhibition rates of CNSL and anacardic acid to up?climbing of snails were 16.7% and 13.3% at the concentration of 2 mg/L, respectively. When the concentration was all 2 mg/L. However, when the concentration exceeded 4 mg/L，the up?climb rate was zero. Conclusion It is very effective for CNSL to control snails, and anacardic acids is the main active ingredient. CNSL, as plant molluscicide, will be widely used in the control of snails.

The results showed that the main flies species of waste disposal was housefly which accounted for 99.16 per cent.The flies which were carried by the garbage vessels were one of the reasonsthat caused flies population density increasing on the wharf and disposal site.The results were a proofthat the fundamental control measure was covered effectively with slush on the waste disposal site.