Fadda, Angela and Barberis, Antonio and D'Aquino, Salvatore and Palma, Amedeo and Angioni, Alberto and Lai, Francesco and Schirra, Mario (2015) Residue levels and performance of potassium sorbate and thiabendazole and their co-application against blue mold of apples when applied as water dip treatments at 20 or 53 °C. Postharvest Biology and Technology, Vol. 106 , p. 33-43. ISSN 0925-5214. Article.
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The efficacy of potassium sorbate (K-sorb) as an antifungal, alone or combined with thiabendazole (TBZ), and hot water at 53 °C, was studied against blue mold on apples. Results demonstrated the fungistatic effect of K-sorb: 2000 mg L−1 significantly reduced Penicillium expansum growth, and a 24 h delay in fungi development was observed in the amended liquid culture. K-sorb at 1% significantly diminished decay incidence, especially when applied at 53 °C. The performance of TBZ was not improved by the co-application of K-sorb. Treatments efficacy was related to K-sorb distribution on fruit surface. ESEM and X-ray qualitative spectra analyses revealed an irregular distribution of K-sorb over the fruit surface and areas with salt accumulation. K-sorb residues remained quite unchanged until 3 d of storage then they declined progressively. Their degradation was influenced by water temperature: it was faster on fruit treated at 53 °C. An inverse relation between P. expansum growth and K-sorb concentration was observed. After 72 h of incubation, P. expansum depleted 99% of K-sorb from liquid culture media.
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