Abstract
BackgroundToxic effect of some local bacterial isolates, isolated from the Egyptian cotton plant (Gossypium barbadance L.), on larvae of the spiny bollworm (SBW), Earias insulana (Boisduval) (Lepidoptera: Nolidae) was studied as well as the biological effects of the most toxic isolate.ResultsBacillus safensis NBRC 100820 had the most toxic effect on the SBW larvae compared to other isolates. Larval mortality percentages were 100, 90, 50, 50 and 30% for newly hatched, 3, 5, 7 and 10-day’s old larvae, respectively, after 2 days from treatment. Moreover, B. safensis NBRC 100820 caused latent effects on different stages of SBW. It decreased the larval and pupal weight, percentages of adult emergence and hatchability as well as number of deposited eggs/female more than the control. Using 16s rRNA confirmed the identification of B. safensis NBRC 100820 and its accession number is MW281809.ConclusionsUse of B. safensis NBRC 100820 can be recommended for biological control of E. insulana. Further field studies are needed.
Highlights
Toxic effect of some local bacterial isolates, isolated from the Egyptian cotton plant (Gossypium barbadance L.), on larvae of the spiny bollworm (SBW), Earias insulana (Boisduval) (Lepidoptera: Nolidae) was studied as well as the biological effects of the most toxic isolate
Using 16s rRNA confirmed the identification of B. safensis NBRC 100820 and its accession number is MW281809
Use of B. safensis NBRC 100820 can be recommended for biological control of E. insulana
Summary
Toxic effect of some local bacterial isolates, isolated from the Egyptian cotton plant (Gossypium barbadance L.), on larvae of the spiny bollworm (SBW), Earias insulana (Boisduval) (Lepidoptera: Nolidae) was studied as well as the biological effects of the most toxic isolate. (Nolidae: Lepidoptera) has been recorded as one of the most destructive insect pests, responsible for great economic losses of cotton yield in Egypt (Nada et al 2010). Biological control represents one of the most effective choice to control many insect pests. Full list of author information is available at the end of the article belonging to the genus Bacillus, are one of the most effective groups of entomopathogenic bioagents (Glare and O’Callagan 2006).
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