Study On The Monitor And Control Of Laspeyresia Pomonella(L.)

Codling moth is a kind of quarantinable and international pest. It will bring panic to growing apple and pears. At present, it spreads to segments of Xinjiang and Gansu province in China. The current from Gansu corridor to Loess Plateau is appearing. So monitor and control for codling moth become more and more important. Finding out the diffusion and propagation condition in time is necessary. It can offer some reference to make a decision to control codling moth exactly. The study of controlling technique about codling moth will offer some experience for prediction scheme.The contents of study includes three parts, one is the monitor of codling moth under field conditions; two is the test of virulence for CypoGV under laboratory conditions; three is prevention and control codling moth using pesticides under both laboratory and field conditions.The codling moth will spread with man's help because it can fly a short distance. So we set up several places in Gansu province and some locations along the line 315. The places include Zhangye city,Yongchang county,Wuwei city,Lanzhou city,Dingxi city,Tianshui city in Gansu province and Changwu county,Luochuan county,Bin county,Baishui County in Shaanxi province. The monitor results in 2009 showed that the codling moth had been monitored in Jinjiawan village in Zhangye city,Hongsimiao village in Yongchang county,Lunan village in Wuwei city,Hongyi village in Lanzhou city. Jinjiawan village in Zhangye city and Hongsimiao village in Yongchang county were infect areas. The maximal amount that been monitored was 75 head/trap. Hongyi village in Lanzhou city was a new area that the codling moth had been monitored. The amount was 2 head/trap. The monitor areas in 2010 were the same as 2009. The results in 2010 were similar as 2009, but some places were more serious. The amount in Lanzhou city in Gansu province in 2010 became bigger than 2009. The maximal amount had been 9 head/trap. The level had been green prediction standard(Ⅱ). The codling moth hadn't been monitored in Shaanxi province in 2009 and 2010.The results of virulence for CypoGV under laboratory conditions were tested. The mortality rate of larva was 88% in experimental group under 1.5×10⁹ OB/ml. The regression equation was y=0.342x-2.022 and LD₅₀ was 8.03×10⁵ OB/ml. The LT50 for CypoGV was 3.65d,4.18d,5.16d,5.62d,6.82d under 1.5×10⁹,1.5×108,1.5×10⁷,1.5×10⁶,1.5×10⁵ OB/ml respectively. The LT50 were low than 7d and more virulent for codling moth.The results of virulence for two biological pesticides and five chemical pesticides under laboratory conditions were tested. The biological pesticides included emamectin benzoate-chlorfenapyr GR and Bacillus thuringiensis SP. The chemical pesticides included deltamethrin EC,profenofos EC,chlorbenzuron WP,fenpropathrin EC,deltamethrin EC.The LD₅₀ of biological pesticides were low than the chemical pesticides for larva. The LD₅₀ of biological pesticides became bigger with the growing larva. The LD₅₀ of emamectin benzoate-chlorfenapyr GR was low than Bacillus thuringiensis SP. The results of control were tested under field conditions. The control efficacy of biological pesticides were above 90% after 5 days and were above 80% after 30 days. Two kinds of biological pesticides were better than five kinds of chemical pesticides for controlling codling moth.