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EFECTO DE VARIOS INSECTICIDAS EN LA LONGEVIDAD DEL PARASI-TOIDE Aphidius ervi HALIDAY (HYMENOPTERA: APHIDIIDAE). EFFECTS OF SEVERAL INSECTICIDES IN LONGEVITY OF THE PARASITOID
RESUMEN Se evaluó en laboratorio el efecto de los insecticidas dimetoato, pirimicarb, imidacloprid, thiacloprid, spi-nosad y azadiractina en la longevidad de Aphidius ervi Haliday, un importante parasitoide de áfidos. Los insecticidas se aplicaron en dosis comerciales sobre parasitoides adultos y momias de Acyrthosiphon pisum (Harris) que contenían parasitoides inmaduros. Los resultados de longevidad permitieron distinguir tres grupos de insecticidas: uno más selectivo cons-tituido por thiacloprid y azadiractina, otro de selectividad intermedia formado por imidacloprid, pirimicarb y spinosad, y dimetoato, el cual afectó severamente la longevidad de los parasitoides. En los tratamientos sobre momias del áfido, todos los productos, excepto thiacloprid y azadiractina, causaron algún grado de intoxicación de los parasitoides adultos durante la emergencia. Palabras clave: acyrthosiphon pisum, Aphidius ervi, azadiractina, dimetoato, imidacloprid, longevidad, pi-rimicarb, spinosad, thiacloprid.
SUMMARY The effects of the insecticides dimethoate, pirimicarb, imidacloprid, thiacloprid, spinosad and azadirachtin, applied at commercial dosages onto mummified Acyrthosiphon pisum (Harris), were evaluated in the labo-ratory on longevity of adult and inmature Aphidius ervi Haliday, an important aphid parasitoid. Results of longevity indicated three insecticide groups. The most selective insecticides were thiacloprid and azadirachtin; followed by a group composed by imidacloprid, pirimicarb and spinosad, which showed mild toxicity on A. ervi. Dimethoate severely affected survival and longevity of parasitoids. Excepting thiacloprid and azadirachtin, toxic residues of the insecticides remaining on mummies treated killed adult parasitoids during emergence. Key words: acyrthosiphon pisum, Aphidius ervi, azadirachtin, dimethoate, imidacloprid, longevity, pea aphid, pirimicarb, spinosad, thiacloprid.
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| Investigación Agrícola, Vol. 20 (2000) - ISSN 0304-5617 |
