Determination of famoxadone, fenamidone, fenhexamid, and iprodione residues in greenhouse tomatoes

ANGIONI, ALBERTO;Porcu L;Dedola F.

2012-01-01

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Abstract

BACKGROUND: Greenhouse tomatoes production is intended exclusively for fresh consumption. Typical greenhouse conditions are proper requirement to the development of different fungus principally late blight and grey mold, which could destroy plants and fruits. For this reason different fungicide with different site action are used in IPM strategies. Famoxadone fenamidone, fenhexamid and iprodione, are different class fungicides with different actions, which could be used to control tomatoes pest. RESULTS: The QuEChERS method showed good recoveries, in addition the analytical method allowed a good separation of the selected fungicides. Repeatability and intermediate precision showed good results with CV < 9.8%. The method limits of determination and of quantification were far below the MRLs set by EU for these fungicides in tomatoes. The analysis of fungicide residues showed that cv shiren accounted for higher residue levels than cv. caramba. The dissipation curves were similar in the two cultivars indicating that the decrease of pesticides was not related to the tomato type. CONCLUSIONS: The use of pesticide in greenhouse condition should be carefully done, since degradation is obtained mainly for fruit growth. The size of the tomato and in particular its surface/weight ratio is very important to define pesticide residues. All fungicides used showed residue levels below the MRL at PHI.