3.3.1. Difenoconazole

The initial residue level of difenoconazole was 0.060 ± 0.011 mg kg−1, which was below the international settled MRL (see Table 1). Difenoconazole dissipated 80% 42 day after spray application. No significant differences were observed between the concentrations before and after the postharvest steps (Student t-test, α = 0.05) (Figure 4).

**Table 4.** The 1st, 1.5th, 2nd, and Root Factor (RF) 1st order model equations that describe the dissipation of difenoconazole, imidacloprid, pyraclostrobin and spinosad in Clementine mandarin. The Best fitting model for each pesticide are in bold font.


**Figure 3.** *Cont*.

**Figure 3.** Dissipation curves for difenoconazole ( **A**); imidacloprid (**B**); pyraclostrobin ( **C**) and spinosad (**D**) in Clementine mandarin in the days after spraying. -♦- Indicates experimental data. — Indicates the back-transformed dissipation curve (the best-fitted mathematical model: 1st-order equation for (**A**,**D**) Root factor (RF) 1st-order equation for (**B**) and 2nd-order for ( **C**).

Harvest time After packing line After postharvest storage

**Figure 4.** Difenoconazole, imidacloprid and pyraclostrobin residues on Clementine at harvest, after the postharvest packing line and after 32 d of cold storage. For difenoconazole and pyraclostrobin, no significant differences were detected between the pesticide levels. For imidacloprid residue concentration at the end of the postharvest period differed significantly from the residue level determined at harvest (Student t-test, α = 0.05).
