Bacterial and fungal antagonists as sources of natural fungicidal compounds for the control of seed rot and aflatoxin-forming fungi from corn and peanut
1999
Anon.
Experimental results showed that seven fungal isolates suppressed the growth of two strains of aflatoxin-forming Aspergillus flavus analyzed from corn and peanut. Also, seven fungal isolates inhibited the growth of seed rot fungi of peanut (Macrophomina sp.). However, no fungal isolates inhibited the growth of seed rot fungi of corn. In the test for volatile compound, five test isolates each from peanut and corn inhibited the aflatoxin-producing A. flavus. Four test isolates inhibited the growth of Macrophomina sp., four test isolate inhibited A. niger, five for Fusarium and two for Thermoascus. The laboratory evaluation of metabolites gave negative results of antagonism. This could be because the purified filtrates of the isolates are not sufficient to control the pathogens or the procedure is not effective to hold the active component of the isolates. And lastly, growth conditions may not warrant the production of the antagonistic compound. For bacterial antagonists, rotary evaporator-concentrated and filter sterilized crude filtrates of four selected Bacillus antagonists (2 from peanut and 2 from corn) showed antibiotic activity against five strains of aflatoxin-forming A. flavus strains in in-vitro experiment using the filter-paper-filtrate impregnated test
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