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In page Taura syndrome:

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The 1992 Ecuadorian TS epidemic occurred concurrently with an outbreak of black leaf wilt disease in banana plantations. The outbreak of black leaf disease led to an increase in fungicide usage within the Taura River basin district near the city of Guayaquil. The fungicides propiconazole (Tilt, Ciba-Geigy) and tridemorph (Calixin, BASF) used to control black leaf, ran off into nearby ponds and were initially thought to be responsible for the disease.[1] Analytical data demonstrated propiconazole in water, sediments and hepatopancreas tissues of shrimp harvested from affected farms in Ecuador. No other pesticides were discovered.