Dissipation of Pre-Harvest Pesticides on ‘Clementine’ Mandarins after Open Field Application, and Their Persistence When Stored under Conventional Postharvest Conditions
| Autor: | Fernando Rivas, Eleana Luque, Verónica Cesio, Horacio Heinzen, Pedro Pintos, Natalia Besil |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Maximum Residue Limit
pesticide residues Spinosad Cold storage Plant Science lcsh:Plant culture 010501 environmental sciences Horticulture 01 natural sciences citrus chemistry.chemical_compound 0404 agricultural biotechnology CITRUS Imidacloprid medicine media_common.cataloged_instance lcsh:SB1-1110 LC-MS/MS European union 0105 earth and related environmental sciences Mathematics media_common Pesticide residue 04 agricultural and veterinary sciences 040401 food science chemistry PESTICIDE RESIDUES DEGRADATION DYNAMIC degradation dynamic Postharvest Clementine medicine.drug |
| Zdroj: | Horticulturae Volume 4 Issue 4 Ainfo Instituto Nacional de Investigación Agropecuaria instacron:Instituto Nacional de Investigación Agropecuaria Horticulturae, Vol 4, Iss 4, p 55 (2018) |
| ISSN: | 2311-7524 |
| DOI: | 10.3390/horticulturae4040055 |
| Popis: | The dissipation of field-applied difenoconazole, imidacloprid, pyraclostrobin and spinosad on Clementine mandarins (Citrus clementina Hort. ex Tan.) under controlled conditions throughout the citrus production chain was assessed. At harvest, 42 days after application, the dissipation of these pesticides were 80, 92, and 48% for difenoconazole, imidacloprid, pyraclostrobin, respectively, and spinosad was below the level of detectability. At day 28 after application, spinosad was no longer detected. The model equations that best describe the dissipation curves of these pesticides on Clementine mandarins showed different patterns. Their half-life on Clementine, calculated by the best-fitted experimental data, were 19.2 day (1st-order model) for difenoconazole, 4.1 day (Root Factor (RF) 1st-order model) for imidacloprid, 39.8 day (2nd-order model) for pyraclostrobin and 5.8 day (1st-order model) for spinosad. These results are the first record of pyraclostrobin persistence on mandarins, showing a longer half-life in this matrix than those reported for any other fruit. The treated fruit were harvested and submitted to the usual postharvest treatments: first, a hypochlorite drenching was performed as a second step, imazalil and wax were applied, and then the mandarins were stored at 4 ° C. After 32 days, cold storage caused no significant effects on the residue levels of the four pesticides compared with those determined on freshly harvested mandarins. All residues were below their Codex and European Union (EU) maximum residue limit (MRL) for mandarin since the spray application day. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|