Seed treatment of maize with Bacillus pumilus strain INR-7 affects host location and feeding by Western corn rootworm, Diabrotica virgifera virgifera
Western corn rootworm (WCR), Diabrotica virgifera virgifera is an important pest of maize and the costs of control and yield loss are estimated at $1 billion per year in the USA. As a specialist herbivore, WCR has evolved to use host odors and secondary plant metabolites as cues for host location and phagostimulants. This study reports that rhizobacteria applied as seed treatments to maize affect host-seeking behavior of WCR larvae. The results of a dual-choice test showed that a significantly higher percentage (76%) of WCR larvae chose untreated control plants than plants treated with the single Bacillus pumilus strain INR-7 (24%). In no-choice feeding tests, WCR larvae-fed INR-7-treated plants weighed significantly less than larvae-fed untreated plants or plants treated with bacilli blends. Overall, the results demonstrate that B. pumilus INR-7 can enhance resistance of maize against damage by WCR larvae. The implication of these findings is discussed in the context of using beneficial rhizobacteria in integrated pest management of corn rootworm.
KeywordsBacillus species Bacilli mixtures Coleoptera Chrysomelidae Induced systemic resistance Biological control
We thank Mr. John Mcinroy for assisting with bacilli preparations. This project was supported by the Alabama Agricultural Experiment Station and the Hatch program of the National Institute of Food and Agriculture, U.S. Department of Agriculture.
This project was supported by the Alabama Agricultural Experiment Station and the Hatch program of the National Institute of Food and Agriculture, U.S. Department of Agriculture.
Compliance with ethical standards
Conflict of interest
All authors declare no conflict of interest.
This article does not contain any studies with human participants or animals performed by any of the authors.
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