Nutritional and microbial quality of extruded fish feeds containing black soldier fly (Hermetia illucens L) larvae meal as a replacement for fish meal for Nile Tilapia (Oreochromis niloticus) and African sharptooth catfish (Clarius gariepinus)

Publication Type

Journal Article

Journal Name

Biocontrol Science and Technology

Publication Date

11-1-2020

Abstract

The present study aimed to (i) determine the distribution of endophytes in selected genotypes, growth stages and parts of maize; (ii) evaluate the larvicidal effect of the endophytes against the spotted stem borer Chilo partellus and (iii) determine the level of colonisation of maize by endophytes. Compared with hybrid and landrace maize, open pollinated variety (OPV) maize exhibited a relatively diversified composition of endophytic bacteria. Among the 39 maize endophyte isolates screened for insecticidal antibiotic production, 11 (8 bacteria and 3 fungi) showed larvicidal activity against C. partellus. Isolate aueb-11 from the genus Bacillus showed the highest mortality (75.93%) against C. partellus. The bacterial isolates varied in terms of their activity to colonise the plant parts, and this was assessed using leaf and seed inoculation methods: in the foliar spray method, the maximum bacterial density recovered from the leaf and stem samples were 9.6 × 102 and 9.2 × 102 colony forming units per gram of sample, respectively. These effective isolates could be promising larvicide against C. partellus.

Keywords

Chilo partellus, endophyte diversity, endophytes, maize genotype

Link to Full Text

Share

COinS