The effects of insecticide seed treatments on the parasitism and predation of Myzus persicae (Homoptera: Aphididae) in canola.
J Econ Entomol
; 117(1): 102-117, 2024 02 12.
Article
em En
| MEDLINE
| ID: mdl-38142133
ABSTRACT
The green peach aphid, Myzus persicae (Sulzer) (Homoptera Aphididae), is a major pest of brassica plants, with the ability to transmitâ
>â
100 viruses. Although the adoption of Integrated Pest Management is increasing, chemical treatment remains the predominant method used to control M. persicae globally. Insecticide seed treatments, typically with neonicotinoid active ingredients, have become commonplace in canola crops, and are viewed as a "softer" alternative to foliar sprays but may nevertheless impact natural enemies of M. persicae. In this study, the effects of canola seed treatments, containing imidacloprid, thiamethoxam, and a mixture of thiamethoxamâ
+â
lambda-cyhalothrin, were investigated on the parasitoid wasp, Aphidius colemani Viereck (Hymenoptera Braconidae) and the green lacewing, Mallada signatus (Schneider) (Neuroptera Chrysopidae), both important natural enemies of M. persicae. Laboratory trials were undertaken using whole plants, with lethal and sublethal effects assessed by measuring several traits. Compared with untreated plants, more aphid mummies were produced and more A. colemani were reared on plants treated with thiamethoxamâ
+â
lambda-cyhalothrin and more aphid mummies were produced on imidacloprid plants. Imidacloprid reduced the time A. colemani spent searching for M. persicae and thiamethoxam reduced its cleaning time. However, after A. colemani were removed from treated plants, there were no such effects observed, suggesting these impacts were relatively short-lived. We found no significant effects of seed treatments on M. signatus. These results point to the complexity of ecotoxicology studies involving multiple trophic levels and indicate that seed treatments may have variable impacts on key fitness traits of natural enemies.
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Texto completo:
1
Coleções:
01-internacional
Contexto em Saúde:
2_ODS3
Base de dados:
MEDLINE
Assunto principal:
Afídeos
/
Piretrinas
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Vespas
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Neonicotinoides
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Inseticidas
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Nitrilas
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Nitrocompostos
Limite:
Animals
Idioma:
En
Revista:
J Econ Entomol
Ano de publicação:
2024
Tipo de documento:
Article