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Thomas Sotiropoulos, Georgios Syrgianidis, Nikolaos Koutinas, Antonios Petridis, and Dimitrios Almaliotis

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Georgios Syrgiannidis, Thomas Sotiropoulos, Nikolaos Koutinas, and Dimitrios Almaliotis

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Thomas Sotiropoulos, Magdalene Koukourikou-Petridou, Antonios Petridis, Dimitrios Stylianidis, Dimitrios Almaliotis, Ioannis Papadakis, Ioannis Therios, and Athanassios Molassiotis

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Thomas Thomidis, Thomas Sotiropoulos, Nikitas Karagiannidis, Constantinos Tsipouridis, Ioannis Papadakis, Dimitrios Almaliotis, and Nikolaos Boulgarakis

The effectiveness of the calcium products Chelan, Power-Ca, and calcium chloride to reduce the development of Monilinia laxa on ‘Andross’ peach (Prunus persica) was investigated. The mycelium growth of M. laxa on potato dextrose agar modified with Chelan, Power-Ca, or calcium chloride compound at concentrations 1, 2, and 4 g·L−1 was significantly reduced in comparison with the water. Chelan, Power-Ca, and calcium chloride applied as foliar sprays did not significantly affect the development of the pathogen on inoculated immature and mature peaches. However, dipping peaches in solutions containing one of the calcium products tested reduced significantly the percentage of M. laxa infection on inoculated fruit.

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Nikolaos Koutinas, Thomas Sotiropoulos, Antonios Petridis, Dimitrios Almaliotis, Emmanuil Deligeorgis, Ioannis Therios, and Nikolaos Voulgarakis

The effect of various commercial calcium (Ca) -containing products applied as preharvest foliar sprays on several fruit quality attributes and nutritional status of the kiwifruit cultivar Tsechelidis for a 2-year period is reported. Foliar application of all Ca products plus boron did not affect mean fruit weight compared with the control. During the first year, the highest flesh firmness was measured after application of the Ca-containing products Acid CaLMg and Calfruit plus Qualyfruit. During the second year, the highest flesh firmness was measured after application of the product Acid CaLMg. The highest ascorbic acid content and total antioxidant power were recorded after application of the product Chelan CaP. Foliar application of Power-Ca resulted in an increase of Ca concentration of leaves compared with the control for the first year. During the second year, all Ca-containing products increased Ca concentration of leaves compared with the control. Foliar application of Calfruit plus Qualyfruit, Chelan CaP, Power Ca, and Acid CaLMg resulted in an increase of Ca concentration of fruits compared with the control. The efficacy of the foliar sprays on some of the tested parameters varied from year to year indicating the influence of other parameters on vine nutrition.