Insects (2019) 10 (4 - 111)

Luis Carlos Martínez, Angelica Plata-Rueda, Francisco Andrés Rodríguez-Dimaté, Juliana Mendonça Campos, Valdeir Celestino dos Santos Júnior, Gabriela Da Silva Rolim, Flavio Lemes Fernandes, Wiane Meloni Silva, Carlos Frederico Wilcken, José Cola Zanuncio and José Eduardo Serrão (2019)
Exposure to insecticides reduces populations of Rhynchophorus palmarum in oil palm plantations with bud rot disease
Insects 10 (4 - 111)
Abstract: The South American palm weevil (SAPW), Rhynchophorus palmarum Linnaeus (Coleoptera: Curculionidae) is the main pest of Elaeis guineensisand damages palm trees with bud rot disease in the Americas. The effects of six neurotoxic insecticides (abamectin, carbaryl, deltamethrin, fipronil, imidacloprid and spinosad) were evaluated against SAPW for toxicity, survival, reproduction, and mortality. Abamectin (LC50 = 0.33 mg mL^-1), Carbaryl (LC50 = 0.24 mg mL^-1), deltamethrin (LC50 = 0.17 mg mL^-1), and fipronil (LC50 = 0.42 mg mL^-1) were the most toxic to SAPW. Adult survival was 95% without exposure to insecticides, decreasing to 78–65% in insects treated with the LC25 and 49–35% in insects exposed to LC50. Sublethal doses of carbaryl, fipronil and imidacloprid showed significant effect on the reproduction of this insect. Mortality of SAPW populations caused by insecticides had similar effects in the laboratory and field conditions. The results suggest that carbaryl, deltamethrin, fipronil, and imidacloprid caused significantly higher mortality as compared to the control in SAPW and may be used to control its populations in oil palm trees where bud rot appears as the key disease for SAPW attraction and infestation.
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Database assignments for author(s): Luis Carlos Martínez, Carlos Frederico Wilcken, José Cola Zanuncio, José Eduardo Serrao

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Rhynchophorus palmarum	Oil palm (Elaeis guineensis)	Colombia