Anais da Sociedade Entomológica do Brasil (2000) 29, 789-797
Everaldo B. Alves, Celso Omoto and Claudio R. Franco (2000)
Mistura de Dicofol com Fempiroximato no Manejo da Resistência de Brevipalpus phoenicis (Geijskes) (Acari: Tenuipalpidae) ao Dicofol
[Mixture of dicofol and fenpyroximate for managing resistance of Brevipalpus phoenicis (Geijskes) (Acari: Tenuipalpidae) to dicofol]
Anais da Sociedade Entomológica do Brasil 29 (4), 789-797
Abstract: The mixture of the acaricides dicofol and fenpyroximate for managing resistance of Brevipalpus phoenicis (Geijskes) to dicofol was evaluated. First, we analyzed the interaction of dicofol and fenpyroximate by testing the LC25s of each product for both susceptible (S) and dicofol-resistant (R) strains of B. phoenicis. Synergistic interaction was detected with the mixture for both strains. Then, the persistence of the biological activity of residues of dicofol (at recommended rate of 360 g of active ingredient (A.I.) / 1,000 L of water), fenpyroximate (at 50 g of A.I. / 1,000 L of water) and the mixture of dicofol and fenpyroximate (at 240 and 25 g of A.I. / 1,000 L; respectively) was evaluated in a commercial citrus grove. After application of the products, fruits were collected periodically and infested with mites of S and R strains in the laboratory. Residues of dicofol and the mixture discriminated the strains; that is, higher mortality of S strain in relation to R strain was observed throughout the experiment. Residues of fenpyroximate did not discriminate the strains, however, fenpyroximate by itself did not give an acceptable control of B. phoenicis. The synergism between dicofol and fenpyroximate was not effective for managing resistance of B. phoenicis to dicofol.
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(original language: Portuguese)
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Database assignments for author(s): Celso Omoto
Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest
control - general
Pest and/or beneficial records:
Beneficial | Pest/Disease/Weed | Crop/Product | Country | Quarant.
|
---|---|---|---|---|
Brevipalpus phoenicis | Citrus (genus) |