Search

To maintain a constant supply of fresh fruit from May to November, producers increase the area of strawberry cultivation under shelters and grow strawberries that repeat fruiting. An additional problem is the reduction of available pesticides caused by the recommendations of the European Green Deal. For these reasons, the authors undertook to compare cultivars to determine which had the best quality fruits and whichplant wasmost resistant to the most dangerous pests.The purpose of this study was to evaluate the effect of the method of plant protection on the health and quality of the fruit yield of three remontant strawberry cultivars grown in a soilless medium. This study evaluated fruit yield and fruit quality as well as the contribution of pathogens to yield losses. For this purpose, standard phytopathological methods were used to identify the causes of disease symptoms on the fruit. At the same time, laboratory tests were carried out on the quality of the harvested strawberries, i.e., firmness and acidity of the fruit, soluble solids content, and respiration rate. The applied protection methods had little effect on the marketable yield and fruit size but had a significant impact on reducing fruit losses caused by the most common diseases. The effectiveness of individual protection methods inreducing the incidence of the tested pathogens and the effect on fruit quality parameters depended on the cultivar and growing season.

The post-harvest processing of strawberries generates considerable amounts of by-products that consist of the inedible parts of the fruit (sepal, calyx, stem, and non-marketable portion of the fruit), which is an environmental problem for local producers and industries. This study aimed to revalue these kinds of tissues through identifying and quantifying the genotype influence on the total phenolic content, phenolic profile, and the antioxidant activity of the by-products from three strawberry cultivars: ‘Festival’ (FE), ‘San Andreas ‘ (SA), and ‘Camino Real’ (CR). The total phenolic content was determined by the Folin–Ciocalteu method, in-vitro antioxidant activity by the DPPH* radical scavenging method and the phenolic profile by PAD–HPLC. The different genotypes showed significant differences (p /Kg of by-product ), followed by SA and CR cultivars. The antioxidant capacity of the SA and FE tissues were similar (p > 0.05) and higher (15.1–16.3 mmol Trolox equivalents /Kg R) than CR. Eight main phenolic compounds were identified and quantified on the three cultivars. Agrimoniin was the principal polyphenol (0.38–1.56 g/Kg R), and the cultivar FE had the highest concentration. This compound showed the highest correlation coefficient with the antioxidant capacity (R2 0.87; p

Florida-produced strawberry (Fragaria ×ananassa) plug transplants (SP) are a potential alternative to bare-root transplants (BR). The adoption of this technology could represent a reduction in water usage for plant establishment and potentially higher early yield, as SP may establish more quickly than BR. Thus, the objective of this study was to evaluate the effect of time in nursery and tray sizes, on early and total strawberry yield for Florida-produced SP for ‘Florida Radiance’, ‘Strawberry Festival’, and Sweet Sensation® ‘Florida127’. Runners from Florida-produced mother plants were collected in mid and late August from 2012 to 2015. SP were grown for either 4 or 6 weeks according to the treatment and established in 30-, 40-, 50-, and 72-cell trays, and compared with BR (control). Additionally, strawberry tips from California were evaluated for SP production. BR consistently had higher early yield than SP, ranging from 36% to 91%, between 2012 and 2016. SP produced the same or higher total yield than BR. Florida-produced SP should be grown for 4 weeks before field transplanting in 50-cell trays based on the results of this study. Furthermore, there was no difference between California and Florida tips for total yield. In all seasons, all SP were established with 20% of the total irrigation water used for the BR. Thus, SP could potentially result in water savings of almost 820,800 gal/acre per season, but the early yield of SP would need to be improved to match BR performance.

This fact sheet reports on a strawberry cultivar trial conducted at New Mexico State University’s Alcalade facility.

This paper describes a method for simultaneous identification and quantification of phenolic compounds in strawberries followed by a reversed-phase high performance liquid chromatography (HPLC) with diode array detection. The studied phenolics were flavonoids (flavonols: quercentin, rutin, and kaempferol; flavanols: catechin and epicatechin; anthocyanidins: cyanidin and pelargonidin) and phenolic acids (hydroxybenzoic acid derivatives: gallic and ellagic acids; hydroxycinnamic acid derivatives: ferulic, coumaric, and cinnamic acids). The mobile phase consisted in a gradient prepared from formic acid in water (2 %, pH 3) and formic acid in methanol (2 %, pH 3), flow rate 0.7 mL min−1 at 25 °C. Analyses were performed, using methanol as extractant, before and after acid hydrolysis with the aim of determining free and conjugated phenolic compounds in strawberries. The acid hydrolysis conditions (6 mol L−1 HCl, 50 min at 90 °C) were shown to be suitable both for phenolic standards and strawberry extracts. Method validation, using phenolic standard solutions, included: linearity study, limits of detection and quantification, and calibration and analytical sensitivity quantifications. Precision and accuracy were studied in strawberry extracts. The results indicate that the developed method was linear, sensible, precise, and accurate, and the convenience of methanol can substitute acetonitrile as the most commonly used solvent in HPLC. The method was employed for knowing the phenolic profile in seven strawberry cultivars from Italy and Argentina, and besides, total phenolic content was analyzed by the Folin–Ciocalteu method; the total antioxidant activity was investigated using the ABTS method. Good correlations were observed among latter parameters, and total phenolics were obtained as the sum of each phenolic compound analyzed by photodiode array detection-HPLC. Fil: Tarola, Anna Maria. Sapienza Università di Roma; Italia Fil: Van de Velde, Franco. Universidad Nacional del Litoral. Facultad de Ingeniería Química. Instituto de Tecnología de Los Alimentos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe; Argentina Fil: Salvagni, Lucilla. Sapienza Università di Roma; Italia Fil: Preti, Raffaella. Sapienza Università di Roma; Italia

A utilização de um sistema adequado para a condução das plantas-matrizes fornecedoras de mudas é de fundamental importância, tanto com a finalidade de favorecer a quantidade de mudas produzidas, como para a qualidade das mesmas; por outro lado, a disponibilidade de mudas em períodos não convencionais de plantio, através da utilização da frigoconservação, possibilita a produção de frutos na entressafra, propiciando maiores ganhos pelos produtores devido aos melhores preços alcançados. Os presentes trabalhos tiveram como objetivos comparar o sistema de produção de mudas de morangueiro convencional com o de produção em vasos suspensos, assim como avaliar a frigoconservação em mudas produzidas em sistema de vasos suspensos. Avaliaram-se a matéria seca, os teores de carboidratos nas mudas e a percentagem de sobrevivência das mesmas após o transplante para local definitivo. No primeiro trabalho, foi utilizado o delineamento inteiramente ao acaso, em esquema fatorial 3x2 (três cultivares: Campinas, Pelican e Guarani; e dois sistemas de produção de mudas), com três repetições de 30 mudas; no segundo trabalho, utilizou-se o delineamento experimental inteiramente ao acaso, com cinco cultivares (Campinas, Dover, Pelican, Sequoia e Sweet Charlie) e nove repetições. Neste último trabalho, após a coleta, as mudas foram acondicionadas em sacos de polietileno e frigoconservadas durante 120 dias em câmara fria (-1 ± 1ºC). As mudas produzidas em vasos suspensos apresentaram maior percentagem de sobrevivência e maiores teores de carboidratos totais, com resultados semelhantes para as três cultivares estudadas. A frigoconservação de mudas de morangueiro produzidas em sistema de vasos suspensos resultou em baixa percentagem de sobrevivência de mudas no experimento. An appropriate conduction system of the plants that originate the runners has a fundamental importance, in order to favor the amount of produced plants and their quality. On the other hand, through the use of the cold storage, the availability of strawberry runners in the off season periods, makes it possible to produce during the off-season period , so that producers can get better prices for the production. These experiments were conducted in order to compare the conventional strawberry runners' production system with the runner production system in suspended pots, and also to evaluate the cold storage of strawberry runners produced in suspended pots system. It was measured the dry matter and carbohydrates contents in runners and the survival percentage when the runner was transplanted to field production areas. The first experiment was conducted in a completely randomized design, with 3x2 factorial outline (three cultivars: Campinas, Pelican and Guarani; and two runners production systems) with three repetitions of thirty runners each; in the second experiment, it was used the experimental entirely random design, with five strawberry cultivars (Campinas, Dover, Pelican, Sequoia and Sweet Charlie) and nine replicates, in the final experiment. After the selection, the runners were conditioned in polyethylene bags and stored under low temperatures during 120 days (-1 ± 1ºC). The runners produced in the system of suspended pots showed higher amount of total carbohydrates and higher plant survival rate. The results were similar for the three cultivars. Cold storage of strawberry runners produced in the system of suspended pots resulted in lower percentage of seedlings survival.

A utilização de um sistema adequado para a condução das plantas-matrizes fornecedoras de mudas é de fundamental importância, tanto com a finalidade de favorecer a quantidade de mudas produzidas, como para a qualidade das mesmas; por outro lado, a disponibilidade de mudas em períodos não convencionais de plantio, através da utilização da frigoconservação, possibilita a produção de frutos na entressafra, propiciando maiores ganhos pelos produtores devido aos melhores preços alcançados. Os presentes trabalhos tiveram como objetivos comparar o sistema de produção de mudas de morangueiro convencional com o de produção em vasos suspensos, assim como avaliar a frigoconservação em mudas produzidas em sistema de vasos suspensos. Avaliaram-se a matéria seca, os teores de carboidratos nas mudas e a percentagem de sobrevivência das mesmas após o transplante para local definitivo. No primeiro trabalho, foi utilizado o delineamento inteiramente ao acaso, em esquema fatorial 3x2 (três cultivares: Campinas, Pelican e Guarani; e dois sistemas de produção de mudas), com três repetições de 30 mudas; no segundo trabalho, utilizou-se o delineamento experimental inteiramente ao acaso, com cinco cultivares (Campinas, Dover, Pelican, Sequoia e Sweet Charlie) e nove repetições. Neste último trabalho, após a coleta, as mudas foram acondicionadas em sacos de polietileno e frigoconservadas durante 120 dias em câmara fria (-1 ± 1ºC). As mudas produzidas em vasos suspensos apresentaram maior percentagem de sobrevivência e maiores teores de carboidratos totais, com resultados semelhantes para as três cultivares estudadas. A frigoconservação de mudas de morangueiro produzidas em sistema de vasos suspensos resultou em baixa percentagem de sobrevivência de mudas no experimento.An appropriate conduction system of the plants that originate the runners has a fundamental importance, in order to favor the amount of produced plants and their quality. On the other hand, through the use of the cold storage, the availability of strawberry runners in the off season periods, makes it possible to produce during the off-season period , so that producers can get better prices for the production. These experiments were conducted in order to compare the conventional strawberry runners' production system with the runner production system in suspended pots, and also to evaluate the cold storage of strawberry runners produced in suspended pots system. It was measured the dry matter and carbohydrates contents in runners and the survival percentage when the runner was transplanted to field production areas. The first experiment was conducted in a completely randomized design, with 3x2 factorial outline (three cultivars: Campinas, Pelican and Guarani; and two runners production systems) with three repetitions of thirty runners each; in the second experiment, it was used the experimental entirely random design, with five strawberry cultivars (Campinas, Dover, Pelican, Sequoia and Sweet Charlie) and nine replicates, in the final experiment. After the selection, the runners were conditioned in polyethylene bags and stored under low temperatures during 120 days (-1 ± 1ºC). The runners produced in the system of suspended pots showed higher amount of total carbohydrates and higher plant survival rate. The results were similar for the three cultivars. Cold storage of strawberry runners produced in the system of suspended pots resulted in lower percentage of seedlings survival.

During the harvest season of two consecutive years, the total phenols, flavonoids, anthocyanins and antioxidant capacity of five strawberry cultivar (‘Arosa’, ‘Elsanta’, ‘Marmolada’, ‘Miss’ and ‘Raurica’), grown in the continental part of the Republic of Croatia, were examined. Each year, fruit was harvested three times, at the beginning, at the midpoint and at the end of the harvesting season. Results showed that in both years, differences in the phenolic compound content depended on cultivar and harvest time. In both years, fruit of cultivar ‘Arosa’ had the highest total phenol content. Over three consecutive harvest times, the quantity of phenolics did not show any regularity, but most of the cultivars at early harvest time had the highest amounts. Most of the cultivars had the lowest quantity of total anthocyanins at the third harvest time.

The anthocyanin composition of the strawberry has been object of various studies, but it is still not fully characterized. It is well known the presence af pelarganidin 3 - glucoside (Pg 3 -gluc) as major anthocyanin, usually accompanied of smaller proportions of pelargonidin 3- rutinoside (Pg 3 -rut) and cyanidin 3-glucosid e (Cy. 3- gluc). Comissão Europeia (Fundo Social Europeu) e Governo Português através do Programa PRODEP (III) - ref.ª 5.3/N/199.006/00-Doutoramento.