28 Feb 2025

Influence of deficit irrigation in phase III of fruit growth on fruit quality in ‘lane late’ sweet orange

The aim of this work was to apply one strategy of deficit irrigation (DI) to improve the final fruit quality in 10-year-old ‘Lane late’ sweet orange grafted on Carrizo citrange (Citrus sinensis L. Osb. x Poncirus trifoliata L.). The experiment was carried out over 2 years in an experimental orchard located in Torre Pacheco (Murcia, south-east Spain). The deficit irrigation treatment consisted of the stopping of irrigation in phase III of fruit growth (1st October–28th February). The irrigation cut-off in phase III reduced the midday stem water potential, the plant water status being heavily influenced by rainfall. In both years, the DI treatment did not alter fruit yield although mean fruit weight was slightly reduced.

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24 Jan 2025
Blood orange

Good volume but smaller sizing on California organic citrus

Organic citrus supply is strong right now. “We’re at the heart of the season for the next 90 days–we’re going on all cylinders on all categories,” says Craig Morris, citrus category director for Homegrown Organic Farms. Those citrus categories include Blood oranges, Cara Caras, grapefruit, lemons, mandarins, Navel oranges, and Pomelos. Next month, it will start with Minneolas and Gold Nuggets as well. “From a volume perspective, we’re probably down about 10 percent this year overall and that’s primarily because our size structure is down about ½ to a full size on most commodities. So there are overall boxes lost because of that,” says Morris, adding that this is because it’s been a relatively dry season so far. “Normally, we have a better range of sizes and we’re hoping to make up some ground because we’re a long way from being done.”

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24 Jan 2025
Post-harvest technology

Challenges and opportunities in the post-harvest sector for 2025

The post-harvest sector is undergoing a transformation, driven by growing challenges and opportunities for innovation. In 2025, key market players—producers, exporters, and marketers—face pressing issues such as rising energy costs, process optimization, and compliance with increasingly stringent quality standards. In this context, Maf Roda firmly believes that automation and artificial intelligence will be essential drivers to meet these demands.

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24 Jan 2025
Shade cloth over citrus

FINAL REPORT: Integrated pest management under nets in the Western Cape

We investigated the incidence of citrus pests under netted and in open orchards. Two sites with paired netted and open orchards in the Western Cape were used in the study, one near Porterville and one near De Doorns. Netting differed in the extent of coverage and maintenance of tears. The study found that pests differed more between sites than between open or netted orchards. The differences between pests in netted and open orchards was more pronounced when netting reached to the ground and was repaired regularly.

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25 Nov 2024

Fruit thinning chemical agents improves fruit size and quality in ‘kinnow’ Mandarin

‘Kinnow’ mandarin (Citrus reticulata Blanco) fruit needs to be thinned to increase the availability of photosynthates used to increase fruit size, fruit quality, profitability and can also help to overcome alternate bearing. This study evaluated ‘Kinnow’ fruit thinning using three chemical agents with different levels of concentration i.e. naphthalene acetic acid (NAA) @ 0.2, 0.3, 0.4, and 0.5 gL 1; 3,5,6 trichloro 2 pyridyloxyacetic acid (3,5,6 TPA) at TPA at 0.2, 0.5, and 0.7 gL 1, and ethephon @ at 0.4, 0.5, and 0.6 gL 1, in Pakistani orchards just after the June fruit drop for two growing seasons 2017 19. Fruit weight was increased due to chemical thinning application when compared with the respective controls.

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25 Nov 2024
Blood Orange

Re-evaluating citrus properties and benefits

Regular intake of carotenoids in the diet has been associated with the key health benefits of reducing the risk of developing degenerative diseases, cardiovascular issues, and obesity. By informing consumers of these health benefits, as well as recent findings of the carotenoid composition of red (lycopene) oranges, the work of this research team is helping to address the unfortunate decline in citrus consumption.

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21 Oct 2024
Post harvest citrus

Alternative methods for the control of postharvest citrus diseases

The postharvest diseases of citrus fruit cause considerable losses during storage and transportation. These diseases are managed principally by the application of synthetic fungicides. However, the increasing concern for health hazards and environmental pollution due to chemical use has required the development of alternative strategies for the control of postharvest citrus diseases. Management of postharvest diseases using microbial antagonists, natural plant-derived products and Generally Recognized As Safe compounds has been demonstrated to be most suitable to replace the synthetic fungicides, which are either being banned or recommended for limited use.

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21 Oct 2024
Girdling

Influence of girdling on the seasonal leaf nutrition status and fruit size of Robinson Mandarin

This study was undertaken to investigate the effects of single and double girdling applications on the fruit yield, commercial size, quality, photosystem II (PSII), leaf chlorophyll and leaf nutrition content of 22-year-old Robinson mandarin (Citrus reticulata). Girdling treatments were performed at anthesis (when 60% of the flowers were opened) with approximately 5 mm trunk diameter in 2014. The fruit was harvested in 2014 at the optimum harvest time (in December) for fruit yield, properties and size. Evaluations of leaf mineral content, chlorophyll concentration and fluorescence measurements were performed at monthly intervals.

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