Potential for a biopesticide bait to control black beetle, Heteronychus arator (Coleoptera: Scarabaeidae)

BACKGROUND Yersinia entomophaga is an entomopathogenic bacterium that is active against scarab beetles, among other insects. In New Zealand, the African black beetle, Heteronychus arator (Coleoptera: Scarabaeidae), is a major pest of pastures and arable crops but very few control options exist and n...

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Bibliographic Details
Published in:Pest management science 2020-12, Vol.76 (12), p.4150-4158
Main Authors: Mansfield, Sarah, Wilson, Michael J, Gerard, Philippa J, Wilson, Derrick J, Swaminathan, Jayanthi, Wright, David A, Koten, Chikako, Hurst, Mark RH
Format: Article
Language:English
Subjects:
Adults
African Americans
Animals
Arable land
Baits
Beetles
Bioassays
Biological Control Agents
Coleoptera
Crops
entomopathogens
Humans
Insecticides
Insects
New Zealand
Pasture
Pest control
Pesticides
Pests
Pitfall traps
scarab pests
Scarabaeidae
Spring (season)
Yersinia
Yersinia entomophaga
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Summary:BACKGROUND Yersinia entomophaga is an entomopathogenic bacterium that is active against scarab beetles, among other insects. In New Zealand, the African black beetle, Heteronychus arator (Coleoptera: Scarabaeidae), is a major pest of pastures and arable crops but very few control options exist and no insecticides are registered for use in established pastures. RESULTS In laboratory bioassays, H. arator adults were susceptible to a bait containing Y. entomophaga at low doses. This bait was more effective against H. arator adults during spring than autumn in small‐scale field plots (320 mm diameter). A large‐scale field trial (40 × 40 m plots) reduced adult numbers substantially: approximately twice as many beetles were captured in pitfall traps from untreated plots compared with plots treated with the Y. entomophaga bait at 70 kg ha−1. This single bait application in spring also reduced subsequent larval populations in summer. CONCLUSIONS Heteronychus arator is a difficult pest to manage using chemical insecticides. This biopesticide with Y. entomophaga as the active ingredient offers a new solution for New Zealand pastures, with potential for application to other crops affected by H. arator and for control of other pests. © 2020 Society of Chemical Industry Approximately twice as many adult Heteronychus arator were captured in untreated plots compared with plots treated with Yersinia entomophaga bait at 70 kg ha−1.
ISSN:1526-498X
1526-4998
DOI:10.1002/ps.5973