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Odontotermes formosanus  (Shiraki), a black-winged subterranean termite, is a common forest pest. A red pigment-producing bacterial strain isolated from the termite was identified as  Serratia marcescens  and named SM1. A bioassay of SM1 on  O. formosanus  show that the LD 50  ranged from 1.77 × 10 4  to 10.82 × 10 4  cells/termite over 21–39 h. Three biological control agents,  Beauveria bassiana  (2 × 10 10  cells/mL),  Metarhizium anisopliae  (1 × 10 10  cells/mL) and  Bacillus thuringiensis  (1.6 × 10 8  IU/mL), were used for an  O. formosanus  bioassay. The results show that the insecticidal effect of  B. bassiana  was stronger than that of  M. anisopliae . In addition, two mixtures were obtained by combining  B. bassiana  (2 × 10 10  cells/mL) with SM1 (1.5 × 10 10  cells/mL), and  M. anisopliae  (1 × 10 10  cells/mL) with  S. marcescens  (SM1) (1.5 × 10 10  cells/mL) in equal volumes. The results show that  B. bassiana  and SM1 was less effective than SM1 alone. However, the insecticidal effect of  M. anisopliae  and SM1 was better than that of  M. anisopliae  or SM1 individually. These studies provide an important contribution for termite biocontrol.

Effects of Serratia marcescens (SM1) and its interaction with common biocontrol agents on the termite, Odontotermes formosanus (Shiraki)