Resumo

RABELO COELHO, Caroline et al. Bioactivity of S. acmella (Asteraceae) on Raoiella indica (Acari: Tenuipalpidae) and its selectivity for the predator Amblyseius largoensis (Acari: Phytoseiidae). Rev. Protección Veg. [online]. 2019, vol.34, n.1  Epub 01-Abr-2019. ISSN 2224-4697.

The jambu, Spilanthes acmella (Asteraceae), has bioactivity on pests, but little is known of the effect on phytophagous mites and its compatibility with predatory mites. The red palm mite, Raoiella indica, is a severe pest of several crops, coconut trees among them. The predatory mite Amblyseius largoensis (Acari:Phytoseiidae) is found in association with R. indica in several countries, and it can assist in the control of this pest in the field. Associated with biological control, products that are compatible with natural enemies could help control this pest. Therefore, the acaricidal activity of S. amella on R. indica and its selectivity for the predator A. largoensis was evaluated using concentration-mortality bioassays of its ethanolic extract (EE). Additionally, the repellent effect and the population growth rate were evaluated in the LC50 and LC80. The EE of S. acmella was highly toxic to R. indica, but it did not kill A. largoensis. The LC50 and LC80 of the EE from S. acmella, estimated for R. indica, were repellent to the pest untill 48 hours after application, while, at its highest concentration, it repelled.

Palavras-chave : pest management; acaricide; Cocos nucifera; biological control; phytochemicals.

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