Issue:ISSN 2095-1353
CN 11-6020/Q
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2013年50 No.1
Efficacy of a mixed formulation of Heterorhabditis bacteriophora ZT (Heilongjiang isolate) and Steinernema carpocapsae Allagainst Bradysia odoriphaga
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Key Words：entomopathogenic nematode, Bradysia odoriphaga, control efficacy, Chinese chive and root maggot
Abstract：
The root maggot, Bradysia odoriphaga Yang et Zhang, is one of the most important insect pests of Chinese chives in northern China. To find alternatives to chemical pesticides for the insect, we have evaluated 3 isolates of Heterorhabditis bacteriophora, HbZT (Heilongjiang), HbLG (Liaoning), and HbNJ (New Jersey, USA), and Steinernema carpocapsae All (ScAll) against 3rd instars and pupae of B. odoriphaga in petri dish, pot and greenhouse assay. We found that the mixed formulation of HbZT and ScAll achieved 100%, 806%, and 100% host mortality in petri dish, pot, and greenhouse assay espectively, which is more effective than using each species alone. In both pot assay and greenhouse assay, the mixed formulation achieved better results with a dose of 05 million IJs/m2 than each species alone at doses of 1 million IJs/m2. Our results also shown that the best time for application of entomopathogenic nematodes is 5 to 10 days after the first adults are detected.