Resumo

MIRANDA VINDAS, Alexandra  e  BLANCO METZLER, Helga. Control    of    Dysmicoccus    brevipes (Hemiptera: pseudococcidae) on the pineapple fruit, San Carlos, Costa Rica. Agron. Costarricense [online]. 2013, vol.37, n.1, pp.103-111. ISSN 0377-9424.

The study evaluated 6 products for Dysmicoccus brevipes control in pineapple production (Ananas comosus). The laboratory test was conducted in the BioEco Natural Company S.A., biocontrol laboratory in Aguas Zarcas, San Carlos, while the field trials were conducted in a commercial pineapple plantation in Venecia, San Carlos. In the laboratory test Beauveria bassiana (4.0 x 10¹⁰ spores.g^-1); Metarhizium anisopliae (1.0 x 10¹⁰ spores.g^-1); a mixture of both fungi (0.5 g + 0.5 g.l^-1 of 4.0 x 10¹⁰ spores.g^-1 + 1.0 x 10¹⁰ spores.g^-1 distilled water); a potassium salt liquid soap  “Goyca®” (7 ml.l^-1); the botanical extract (Biorep®) (a hot pepper, garlic, onion, mustard and gavilana mixture) (7 ml.l^-1); and distilled water as control, were evaluated. The most promising results were with the botanical extract and the liquid soap, which caused faster mortality. The treatments evaluated in the pineapple plantation, var. MD-2, were the same, except for the control where products in use in the commercial farm were used: Diazinon®  60 EC (diazinon) (0.5 ml.l^-1) and  Sevin®    80  WP  (carbaril)  (1  kg.ha^-1).  The botanical extract resulted in the lowest incidence of mealybugs (X=6.4), < control (X=10.8), < the Goyca (X=13.7), < M. anisopliae (X=44.4), < B. bassiana (X=45.1), and < B.b+M.a (X=45.8). There  were  no  differences  in  fruit  length  and girth as a result of the applied products. The cost per hectare was similar among treatments, being lowest in the control (18.800 colons), and highest in the botanical extract (29.700 colons). The results show as best option the use of the liquid soap used to control D. brevipes.

Palavras-chave : Biological control; insects; pineapple; Dysmicoccus brevipes.

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