RESUMEN
By using molecular marker of group I intron, a field evaluation was made on the efficacy of sustainable control of Monochamus alternatus by non-woven fabric bands impregnated with Beauveria bassiana. The results showed that the control efficacy in two treated plots was 19.5% and 10.8%, and 14.2% and 11% when evaluated with conventional and molecular evaluation methods, respectively, suggesting that the conventional method which evaluated the control efficacy in terms of microbes mortality or infection rate couldn't distinguish the efficacies caused by released biocontrol agents and indigenous pathogens, while molecular method could avoid the interference of indigenous pathogens and give an objective and reasonable evaluation on the efficacy of microbial control.