Impact of metal salts on the survival, development, and oviposition behavior of coconut rhinoceros beetle (Coleoptera: Scarabaeidae)
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View abstract on PubMed
Summary
This summary is machine-generated.Metal salts in biosolid waste may control the invasive coconut rhinoceros beetle (Oryctes rhinoceros). Studies show increased salt concentrations significantly reduce larval survival and adult development, offering a novel pest management strategy.
Area Of Science
- Agricultural Science
- Entomology
- Environmental Science
Background
- The coconut rhinoceros beetle (Oryctes rhinoceros) is a significant invasive pest of palms in the Pacific Region, including Hawaii.
- Limited effective management options are currently available for this pest.
- Larvae of O. rhinoceros typically develop in organic materials like green waste and animal manure.
Purpose Of The Study
- To investigate if elevated metal salts in biosolid waste contribute to its inhospitable nature for O. rhinoceros.
- To determine the impact of various metal salts on O. rhinoceros survival, development, and oviposition behavior across different life stages.
Main Methods
- Acute and chronic exposure experiments were conducted on O. rhinoceros life stages using metal salt solutions (CaCl2, KCl, MgCl2, NaCl, MgSO4) at increasing concentrations.
- Larval survival, instar development, adult biometrics, and female oviposition behavior were assessed.
- Experiments involved exposing larvae to hydrated mulch and rearing eggs through pupation under different salt concentrations.
Main Results
- Acute exposure to metal salt concentrations above 0.5 M resulted in 100% mortality for first and second-instar larvae.
- Chronic exposure to Epsom salt (MgSO4) at 1x and 2x recommended rates significantly delayed development and reduced adult size.
- High concentrations (5x) of Epsom salt prevented egg hatching or caused early larval death, and gravid females avoided ovipositing in highly concentrated media.
Conclusions
- Elevated metal salt concentrations in biosolid waste are detrimental to O. rhinoceros survival and development.
- Metal salts, particularly Epsom salt, show potential as a novel and effective management strategy for O. rhinoceros populations.
- This research offers a promising avenue for controlling this invasive palm pest by leveraging naturally occurring or amended soil components.
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