Study On The Distribution Of Oncomelania Hupensis And Output Risk Assessment In Nursery Industrial Park

Part1 The distribution of Oncomelania hupensis and cause analysis in Zhejiang ProvinceObjective To analysis the environment of snail distribution and the reason of snail in Zhejiang Province during 2013-2015, in order to provide scientific data for the strategies of snail control. Methods The data of snail surveillance during 2013-2015 were collected and analyzed. And then sent a questionnaire, to collect data and related statistical analysis. Results Small number of snail were found every year in an area of 130.88hm~2. There is 3691 snail spot but no infected snail was found. The distribution of environment mainly were four kinds, include ditc, paddy, nursery and aquaculture area. The proportion of nursery and aquaculture area of snail were increased year by year. In 2013, respectively, accounted for detected snail area was 18.96% and 14.53%; In 2014, respectively, accounted for detected snail area was 23.48% and 17.11%, In 2015, respectively, accounting for detected snail area was 19.14% and 11.1%. Analysis by spss19.0 software, in 2013, four environment detected snail area of compression rate was ditch (91.00%)>paddy (88.11%)>nursery (53.94%)>aquaculture area (44.86%), the difference was statistically significant (x2=110352.54, P<0.05), four environment actual snail area of compression rate was ditch (58.40%)>paddy (53.36%)>nursery (35.78%)>aquaculture area (27.58%), the difference was statistically significant (x2=58028.36, P<0.05); In 2014, four environment detected snail area of compression rate was ditch (97.22%)>paddy (94.14%)>nursery (64.00%)> aquaculture area (54.21%), the difference was statistically significant (x2=75559.70, P<0.05), four environment actual snail area of compressionrate was ditch(64.66%)>paddy (58.78%)>nursery(37.99%)>aquaculture area (28.79%), the difference was statistically significant (x2=53764.85, P<0.05); In 2015, four environment detected snail area of compression rate was ditch (96.15%)>paddy (93.53%)>nursery (61.41%)>aquaculture area (47.21%), the difference was statistically significant (x2=32401.63, P<0.05), four environment actual snail area of compression rale was ditch (53.58%)> paddy (49.17%)>nursery (36.84%)>aquaculture area (22.37%), the difference was statistically significant (x,2=33553.61, P<0.05).The nursery and the aquaculture area environment of compression rate was low. In2013, detected snail area of compression rate respectively was 53.94% and 44.86%, the actual snail area of compression rate respectively was 35.78% and 27.58%. In 2014, detected snail area of compression rate respectively was 64% and 54.21%, the actual snail area of compression rate respectively was 37.99% and 28.79%.In 2015, detected snail area of compression rate respectively was 26.23% and 17.97%, the actual snail area of compression rate respectively was21.03% and 16.28%. Conclusions There are still a certain areas of snail in Zhejiang province, effect of nursery and aquaculture area of reproduction and diffusion of snail was gradually increased. We need to strengthen the monitoring, to take the necessary measures to further the effective compression area of snail.Part2 Study on the distribution of Oncomelania hupensis and output risk assessment in Nursery Industrial ParkObjective To investigate the distribution of snail in nursery industrial park in Zhejiang, to assess the risk of seedlings carrying snail output, in order to provide scientific data for the strategies of snail control and protect the healthy and orderly development of nursery stock industry. Methods Selection of sweet scented osmanthus (large tree)% CamelliaSasanqua (small tree) n PurpusPrivet (shrub) seedlings of three species, using systematic sampling combined with environmental sampling to survey three spieces of the seedling, then the random sampling method respectively to three spiece of seedlings were randomly selected from each 30 seedlings, with the comprehensive examination method on the seedlings ground diameter of snail distribution range and the situation of snails were investigated in soil. Selection of Photinia Fraseri (small tree) seedlings, susing systematic sampling combined with environmental sampling to survey the seedling, then the random sampling method to selected 50 seedlings, with the comprehensive examination method to investigate the risk with seedling mud ball carrying snails move. Results sweet scented osmanthus-. Camellia Sasanqua、PurpusPrivet seedlings of snail density respectively 0.076/0.1m~2,0.56/0.1m~2,0.55/0.1m~2. Sweet scented osmanthus tree in 0cm-20cm scope of snail proportion were 19.06%, in 20cm-40cm scope of snail proportion were 24.56%, in 40cm-60cm scope of snail proportion were 20.63%, in 60cm-80cm scope of snail proportion were 20.43%, in 80cm-100cm scope of snail proportion were 15.32%, the snail distribution in each range was relatively balanced. Camellia Sasanqua and PurpusPrivet mainly in 20cm-30cm scope of surrounding environment of snail, snail proportion respectively were 70.18% and 65.70%. The three spieces of seedlings of proportion of snail in surface soil respectively were 66.80%、70.50% and 58.30%, three spieces of seedlings of proportion of snail in Shallow layer soil respectively were 28.57%..28.70% and 37.40%, three spieces of seedlings of proportion of snail in deep layer soil respectively were 4.62%、0.80% and 4.30%. Analysis by spssl9.0 software, there was statistically significant difference between the proportion of three spieces of seedlings in different parts of the total number of snails (χ2=33.87, P<0.05). Photinia Fraseri seedlings of snail density were 10.95/0.lm~2,50 randomly selected seedlings mud ball exist snail, The detection rate of snails was 100%. Total snail were 3726, adult snail number were 706, accounting for 18.95%, immature snails number were 3020, accounting for 81.05%. The average snail mud ball 75 seedlings/plant. Conclusions The nursery industry park have high snail density, to exist snail in seedlings mud ball, to exist output risk. Therefore, it is suggested that the relevant documents or provisions for inspection and quarantine of snail as soon as possible to publish before sinotrans or selling seedlings, to control the growth and reproduction of snail in nursery industrial park, to reduce the risk of outward diffusion of seedings carrying the snail.