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Identification of strains of Botrytis cinerea in grapes resistant to dicarboximide fungicides

Iris Carreño I.1 y Mario Alvares A.1

Isolates of Botrytis cinerea Pers. Fr. resistant to dicarboximide fungicides were isolated from a vineyard cv. Thompson Seedless, located in Pudahuel, Metropolitan Region of Chile. Dicarboximide fungicides have been widely used in this location to control grey mold. Dicarboximide-resistant isolates were of low-level resistance, so the ED50 values found ranges from: 2.30 to 3.19, 0.60 to 3.50, and 1.40 to 7.00 for iprodione, vinclozolin and procymidone, respectively. These isolates were also diclora-resistant, demonstrating cross-resistance.

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1 Estación Experimental La Platina (INIA), Casilla 439, Correo 3, Santiago, Chile

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