Pathogenicity and field control efficiency of Mucor hiemalis BO-1 against Bradysia odoriphaga Larvae
Mucor hiemalis BO-1 is a newly reported entomopathogenic fungus that infects Bradysia odoriphaga,a destructive root maggot.However,the pathogenicity and field control efficiency of M.hiemalis BO-1 against B.odoriphaga are unknown.In this study,we analyzed the pathogenicity of M.hiemalis BO-1 to B.odoriphaga larvae and its relation to temperature and evaluated its application value by pot and field experiments.The results indicated that M.hiemalis BO-1 was of acute pathogenicity against B.odoriphaga larvae and was as toxic as some chemical pesticides.At 3 d after treatment,the median lethal concentrations(LC50)to the 2nd and 4th instar larvae were 3.714× 105 spores/mL and 4.680 × 106 spores/mL,respectively.Moreover,M.hiemalis BO-1 also showed pathogenic activities against B.difformis and Delia antiqua larvae.The optimal temperatures for high pathogenic activity of M.hiemalis BO-1 were 16-28 ℃,especially at 20-24 ℃.The results of pot and field experiments confirmed excellent control efficiency of M.hiemalis BO-1 against B.odoriphaga larvae,which exceeded 80％at 7 d after treatment with spore concentration of 1 X 107 spores/mL,the equivalence to the chemical insecticide clothianidin.In addition,M.hiemalis BO-1 exhibited high persistence in control of B.odoriphaga.Therefore,M.hiemalis BO-1 is of high perspective as a biocontrol agent against B.odoriphaga.
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