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Background  Considerable attention has been paid to actinomycetes, especially the secondary metabolites obtained from  Streptomyces  species, as the best alternatives to chemicals as biological control agents for polyphagous pests such as  Helicoverpa armigera  and  Spodoptera litura.  On the basis of their novel biocontrol attributes, novel polyketide metabolite isolated from marine  Streptomyces  sp. AP-123 exhibited significant antifeedant, larvicidal and growth inhibitory activities against polyphagous pests.    Results  Leaf disc no-choice method was used for the insect bioassay. The polyketide metabolite presented significant antifeedant activities against  H. armigera  (78.51%) and  S. litura  (70.75%) at 1000 ppm concentration. The metabolite also exhibited high larvicidal activities against  H. armigera  (63.11%) and  S. litura  (58.22%) and the LC 50  values were 645.25 ppm for  H. armigera  and 806.54 ppm for  S. litura . The metabolite also prolonged the larval–pupal duration of the insects at all the tested concentrations.    Conclusions  The activities of the polyketide metabolite were concentration dependent for both the insects therefore it could be used as an agent to prepare new pesticidal formulations.

bmc microbiology

Antifeedant, larvicidal and growth inhibitory bioactivities of novel polyketide metabolite isolated from Streptomyces sp. AP-123 against Helicoverpa armigera and Spodoptera litura