Effect of Bacillus safensis NBRC 100820 isolated from cotton plant against the spiny bollworm, Earias insulana (Boisduval)

Abstract Background Toxic effect of some local bacterial isolates, isolated from the Egyptian cotton plant ( Gossypium barbadance L.), on larvae spiny bollworm (SBW), Earias insulana (Boisduval) (Lepidoptera: Nolidae) was studied as well biological effects most toxic isolate. Results Bacillus safensis NBRC 100820 had SBW compared to other isolates. Larval mortality percentages were 100, 90, 50, 50 and 30% for newly hatched, 3, 5, 7 10-day’s old larvae, respectively, after 2 days treatment. Moreover, B. caused latent different stages SBW. It decreased larval pupal weight, adult emergence hatchability number deposited eggs/female more than control. Using 16s rRNA confirmed identification its accession is MW281809. Conclusions Use can be recommended control E. . Further field studies are needed.