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Microbial entomopathogen—based bioinsecticides are recognized as alternatives to synthetic pesticides. Insects defend themselves against microbial pathogens by innate mechanisms, including increased phenoloxidase (PO) activity, but its relationship with microbial bioinsecticides efficacy is little known. This study evaluated the differences in PO activity at different developmental stages of the tobacco budworm  Heliothis virescens  Fabricius (Lepidoptera: Noctuidae), Indian meal moth  Plodia interpunctella  (Hübner) (Pyralidae), beet armyworm  Spodoptera exigua  (Hübner) (Noctuidae), and cabbage looper  Trichoplusia ni  (Hübner) (Noctuidae). Additionally, 2 nd - and 4 th -instars were exposed to the LC 50  value of the commercial  Bacillus thuringiensis  (Bt) spray, Biobit ® . The percentage of insecticidal activity (IA%) on 2 nd -instar Biobit—exposed larvae was approximately the predicted 50 % mortality for all species except  S. exigua.  With all 4 th  instar Biobit—exposed larvae, mortality was not significantly different from that of unexposed larvae. Unexposed insects had a significantly higher PO activity in pre—pupae and pupae than early—instar larvae and adults, whereas PO activity was higher in adult females than in males. Correlation analysis between IA% and PO activity revealed significant  r —values ( p  < 0.01) in 2 nd  instar  H. virescens  ( r  = 0.979) and  P. interpunctella  ( r  = 0.930). Second instar Biobit—exposed  P. interpunctella  had 10 times more PO activity than unexposed larvae. Similarly, the amount of total protein was lower in 4 th  instar Biobit—exposed  H. virescens  and higher in  S. exigua.  Therefore, the results indicated a relationship between Biobit susceptibility and PO activity in some cases. This information may be useful if the Biobit application period is timed for a developmental stage with low PO activity. However, more studies are needed to determine the correlation of each insect with a particular bioinsecticide.

Comparative Evaluation of Phenoloxidase Activity in Different Larval Stages of Four Lepidopteran Pests After Exposure toBacillus thuringiensis