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Assessment of Yersinia entomophaga as a control agent of the diamondback moth Plutella xylostella

Author:
Hurst, Mark Robin Holmes, Jones, Sandra Andrea, Beattie, Amy, van Koten, Chikako, Shelton, Anthony Minot, Collins, Hilda Lam, Brownbridge, Michael
Source:
Journal of invertebrate pathology 2019 v.162 pp. 19-25
ISSN:
0022-2011
Subject:
Bacillus thuringiensis, Plutella xylostella, Yersinia, bacteria, biological control, culture media, foliar spraying, gels, larvae, leaves, lethal dose 50, spinosad
Abstract:
The application of the biocontrol bacterium Yersinia entomophaga as a foliar spray was assessed for its efficacy against larvae of the diamondback moth, Plutella xylostella. The bacterium was applied as either a broth suspension, or as a biopolymer-based gel foliar spray and compared with commercial insecticides Dipel (Bacillus thuringiensis) and Spinosad. The performance of Y. entomophaga was comparable with that of Dipel. The gel-based formulation extended leaf persistence over that of the basic broth culture spray, while also providing higher initial foliar deposition rates. The bacterium was found to multiply within the P. xylostella larvae to 5.8 × 105 cells per larva, while the median lethal dose (LD50) was determined to be 2.69 × 103 cells per larva. Importantly, B. thuringiensis Cry1A-resistant, Cry1C-resistant, indoxacarb/pyrethroid-resistant, and Spinosad-resistant P. xylostella larvae were susceptible to Y. entomophaga.
Agid:
6301206