[ Objectives ] The paper investigated the occurrence and damage of thrips on winter vegetable cowpea in Sanya City, to summarize prediction method and control measures against the insect pest. [ Methods] Prediction th...[ Objectives ] The paper investigated the occurrence and damage of thrips on winter vegetable cowpea in Sanya City, to summarize prediction method and control measures against the insect pest. [ Methods] Prediction through analogy suggested that cowpea could be damaged by thrips throughout the entire growth period. [Results] The peak occurrence and damage period of thrips was after transplanting of cowpea from December to early March in the following year. The occurrence of thrips was severe in the case of high temperature and drought, or was light when encountering rainy season. [ Conclusions ] Using fivepoint sampling method, blue boards were hanged up for monitoring （five pieces each point, specifieation 25 cm × 30 cm）. When the number of thrips on blue board reached 10 specimen/piece, it was the optimal control period of thrips, and different prevention and control measures could be adopted according to the specifi growth stages of cowpea.展开更多
[ Objective] The paper was to explore the deratization and anti fertility effect of triptolide on farmland rats in Sanya City. [ Method] Autumn and spring control tests were carried out in Potianyang and Miaolinyang, ...[ Objective] The paper was to explore the deratization and anti fertility effect of triptolide on farmland rats in Sanya City. [ Method] Autumn and spring control tests were carried out in Potianyang and Miaolinyang, respectively. [ Result] The rat density in autumn control area decreased from 28.57% （ out break） to 2.86%, 3.81% and 6.80% at 11,41 and 70 d after triptolide treatment, respectively. The rat density in spring control area was lower at 19 and 47 d post treatment, and the correction deratization effect was 99.48% -99.88%. The testicular descent rate and pregnancy rate decreased significantly after treatment of triptolide. [Conclusion] Triptolide was safe in application, and is hence recommended for large scale extension in the farmland in Sanya City.展开更多
文摘[ Objectives ] The paper investigated the occurrence and damage of thrips on winter vegetable cowpea in Sanya City, to summarize prediction method and control measures against the insect pest. [ Methods] Prediction through analogy suggested that cowpea could be damaged by thrips throughout the entire growth period. [Results] The peak occurrence and damage period of thrips was after transplanting of cowpea from December to early March in the following year. The occurrence of thrips was severe in the case of high temperature and drought, or was light when encountering rainy season. [ Conclusions ] Using fivepoint sampling method, blue boards were hanged up for monitoring （five pieces each point, specifieation 25 cm × 30 cm）. When the number of thrips on blue board reached 10 specimen/piece, it was the optimal control period of thrips, and different prevention and control measures could be adopted according to the specifi growth stages of cowpea.
文摘[ Objective] The paper was to explore the deratization and anti fertility effect of triptolide on farmland rats in Sanya City. [ Method] Autumn and spring control tests were carried out in Potianyang and Miaolinyang, respectively. [ Result] The rat density in autumn control area decreased from 28.57% （ out break） to 2.86%, 3.81% and 6.80% at 11,41 and 70 d after triptolide treatment, respectively. The rat density in spring control area was lower at 19 and 47 d post treatment, and the correction deratization effect was 99.48% -99.88%. The testicular descent rate and pregnancy rate decreased significantly after treatment of triptolide. [Conclusion] Triptolide was safe in application, and is hence recommended for large scale extension in the farmland in Sanya City.
