Application strategies by selective medium treated with entomopathogenic bacteria Serratia marcescens and Pseudomonas aeruginosa as potential biocontrol against Coptotermes curvignathus

The success of microbial termiticides in controlling termites depends on the ability of microbes to grow in different medium and the functionality of the microbes as a resistant barrier or toxic bait. This study was conducted to understand the mortality rate and behaviour changes of subterranean termite (Coptotermes curvignathus Holmgren) introduced with different concentrations of Serratia marcescens strain LGMS 1 and Pseudomonas aeruginosa strain LGMS 3 using wood and soil as bacterial transfer medium. In general, higher concentration of bacteria in soil caused reduction in tunnelling activity, wood consumption and an increased in mortality. However, application on wood revealed a different outcome. Wood treated with S. marcescens of 106 CFU/mL concentration proved to be more efficient as bait than higher concentration applications as it caused high mortality rate while still highly palatable for termites. Wood or soil treated with S. marcescens concentration higher than 109 CFU/mL cr...

微生物源白蚁防治剂（microbial termiticides）防控白蚁的成效，取决于微生物在不同基质中的增殖能力，以及其作为抗性屏障或毒饵的功能特性。本研究以木材、土壤作为细菌传递基质，探究不同浓度的粘质沙雷氏菌（Serratia marcescens）菌株LGMS 1与铜绿假单胞菌（Pseudomonas aeruginosa）菌株LGMS 3对地下白蚁（subterranean termite）——弯颚乳白蚁（Coptotermes curvignathus Holmgren）的死亡率及行为变化的影响。总体而言，土壤中的细菌浓度越高，白蚁的钻土活动与木材取食量便越低，死亡率则随之升高。但木材处理组的结果却存在差异：当使用浓度为10⁶ CFU/mL的粘质沙雷氏菌处理木材时，其作为毒饵的效果优于更高浓度的处理组——该浓度既可引发高死亡率，同时仍能保持对白蚁的高适口性。当使用浓度高于10⁹ CFU/mL的粘质沙雷氏菌处理木材或土壤时，cr...