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Abstract Forty strains of symbiotic bacteria were isolated from entomopathogenic
nematodes.Bioassay results showed that all strains had virulent activity to the first
instar larvae of Laphygma exigua and Colletotrichum gloeosporiodies to some extent,among
which Xenorhabdus nematophila A24-1 strain was the best one.The average corrected
mortalities to Laphygma exigua was 100.00 %,and the diameter of antibiotic circle to
Colletotrichum gloeosporiodies was 40.00 mm.
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