The longkong bark eating caterpillar, Cossus chloratus Swinhoe (Cossidae: Lepidoptera), is a serious pest of longkong trees Lansium domesticum Corrêa that affects quality and quantity of the fruit. For eco-friendly management of this pest, Metarhizium guizhouense PSUM02, an entomopathogenic fungus, was tested under laboratory and field conditions of Thailand. Relative humidity (RH) more than 93% provides the highest virulence to M. guizhouense PSUM02 by reducing the survival of C. chloratus larvae to 0.0–18.0%. The average survival time (AST) of C. chloratus larvae infected with M. guizhouense PSUM02 at 100% RH showed the lowest AST of 3.9 ± 0.2 days. The optimum temperature for M. guizhouense PSUM02 to infect C. chloratus larvae was 25–30 °C with 2–20% survival after 10 days of treatment. The AST of C. chloratus larvae infected with M. guizhouense PSUM02 at 25 °C or 30 °C was 5.8 ± 0.6 or 3.4 ± 0.2 days, respectively, which was significantly lower than the AST observed at 20 °C and 35 °C temperatures. M. guizhouense PSUM02 showed effectiveness under field conditions by reducing the number of larvae of longkong bark eating caterpillar C. chloratus in treated longkong tree. The application of M. guizhouense PSUM02 could be an effective option for the eco-friendly management of longkong bark eating caterpillars in the longkong orchards of Thailand and other longkong producing countries.

食用毛虫毛虫的长孔树皮（Cossus chloratus Swinhoe）（长鳞翅目）是长孔树Lansium domesticumCorrêa的严重害虫，会影响果实的质量和数量。为了对这种害虫进行生态友好的管理，在泰国的实验室和田间条件下对一种致病性真菌-贵州根霉PSUM02进行了测试。超过93％的相对湿度（RH）通过将绿藻小球藻幼虫的存活率降低至0.0-18.0％，为贵州M. PSUM02提供了最高的毒力。贵州分枝杆菌感染的绿藻幼虫的平均存活时间（AST）在100％RH下的PSUM02显示3.9±0.2天的最低AST。治疗十天后，贵州分枝杆菌PSUM02感染绿藻梭菌幼虫的最佳温度为25–30°C，存活率为2–20％。在25°C或30°C感染贵州分枝杆菌PSUM02的绿藻按蚊幼虫的AST分别为5.8±0.6或3.4±0.2天，明显低于在20°C和35°C的温度下观察到的AST。 。M. guizhouense PSUM02在田间条件下通过减少处理过的长孔树中食用毛虫毛绿藻的长孔树皮幼虫的数量显示了有效性。贵州贵州菜的应用 PSUM02可能是泰国和其他龙岗生产国果园的长孔树皮食用毛毛虫生态友好管理的有效选择。