| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4518512 | Postharvest Biology and Technology | 2013 | 9 Pages |
Imazalil (IMZ) is widely used in citrus packhouses to manage green mould, caused by Penicillium digitatum. The aim of this study was to investigate green mould control efficacy of IMZ applied in a wax coating, and the combination of aqueous dip and coating IMZ applications. Single application of IMZ at 3000 μg mL−1 in carnauba wax coating at rates of 0.6, 1.2 and 1.8 L tonne−1 of fruit gave better protective (mean 13% infection) than curative (mean 70% infection) control of the sensitive isolate. Imazalil residue levels increased (0.85 to 1.75 μg g−1) with increasing coating load. However, the resistant isolate could not be controlled (>74% infection). Dip only treatment (IMZ sulphate at 500 μg mL−1 for 45 s and 90 s) gave good curative control (≈77%) of the sensitive isolate at residue loading of 0.12–0.73 μg g−1. Wax coating only treatment (IMZ at 3000 μg mL−1 at 1.8 L wax tonne−1) gave good protective control and improved sporulation inhibition (≈80%) at residue loading of 1.32–7.09 μg g−1. The MRL of 5 μg g−1 was exceeded at higher wax loads on navels and clementines. Double application with dip (45 s in IMZ sulphate at 500 μg mL−1) followed by 2000 μg mL−1 IMZ in wax coating at 0.6, 1.2 and 1.8 L wax tonne−1 resulted in residue loading of 1.42 to 2.83 μg g−1, increased protective control (≈69%) as well as curative control (≈83%). In all treatments, poor curative and protective control of the resistant isolate was observed (<46% and <55%, respectively). Double application demonstrated superior green mould control by giving good curative and protective control and sporulation inhibition.
► Imazalil (IMZ) applied in wax coating was evaluated for citrus green mould control. ► IMZ in coating gave better protective than curative control of a sensitive isolate. ► IMZ dip application showed better curative control of the sensitive isolate. ► IMZ in coating gave better sporulation inhibition. ► Double IMZ application in dip and wax showed superior green mould control.
