Preharvest Peroxyacetic Acid Sprays Slow Decay and Extend Shelf Life of Strawberries (original) (raw)
Related papers
The Use of Fungicide Alternatives for Controlling Postharvest Decay of Strawberry and Orange Fruits
Journal of Plant Protection Research, 2008
Control measures of postharvest diseases of strawberry and navel orange fruits using hydrogen peroxide, calcium chloride and chitosan were evaluated under in vitro and in vivo conditions. All tested concentrations of chemicals used were able to reduce the linear growth and spore germination of B. cinerea; R. stolonifer; P. digitatum and P. italicum. Complete inhibition of linear growth and spore germination was obtained with concentrations of 1.5 and 2.0% of all treatments. Under storage conditions, significant reduction in descending order of mould incidence was observed in strawberry and orange fruits treated with ascending concentrations of calcium chloride, hydrogen peroxide and chitosan. Obtained data revealed significant reduction in mould incidence in fruits when treated by calcium chloride and chitosan 12h before artificial inoculation with the mould pathogens, while hydrogen peroxide showed the opposite result. The present study demonstrated that the application of hydrogen peroxide is superior to treatment with calcium chloride or chitosan enhanced the control activity against mould pathogens which as it expressed was as either percentage of diseased fruits or decay development as rotted tissue weight of strawberry and navel orange. The applied tested chemical might act as contact and systemic fungicides which have a protective or therapeutic effect.
International Journal of Fruit Science, 2018
The effect of spray washing disinfection with peracetic acid (PAA) on quality attributes of fresh-cut strawberries was studied. The effectiveness on native microflora and experimentally inoculated Escherichia coli was also investigated. The responses were evaluated at 0 day and after 7 days of storage (2°C). PAA concentration (1-240 mg L −1) and spraying time (11-138 seconds) did not affect the retentions of quality attributes. Optimizing the process at days 0 and 7 allowed to obtain significant reductions for total mesophilic microorganism, molds, and yeasts; furthermore, E. coli reduction was 3.4 log (day 0). All these results suggest that spraying with PAA could be a good disinfection method.
Pre-storage hypobaric treatments delay fungal decay of strawberries
Postharvest Biology and Technology, 2013
Fungal decay is a major cause of postharvest losses in strawberries. The traditional approach for controlling fungal decay is the use of fungicides. However, the use of fungicides has been questioned as a sustainable and safe method, and is also prohibited in many countries. One potential physical method for reducing fungal decay is application of a short-term hypobaric treatment prior to storage. In this study efficacy of postharvest hypobaric treatments to control natural rot development in strawberries was evaluated. Strawberries were treated with hypobaric pressures (25 kPa a , 50 kPa a and 75 kPa a) for 4 h at 20 • C and subsequently stored at 20 • C or 5 • C. A 50 kPa a treatment consistently delayed rot development in samples stored at either temperature confirming that the technique has potential as a non-chemical treatment. Moreover 50 kPa a treatments did not affect weight loss and firmness at either 20 • C or 5 • C. An initial increase in respiration rate was observed in 50 kPa a treated samples potentially indicating mild stress due to hypobaric treatment. An in vitro fungal study found that 50 kPa a treatment for 4 h did not affect the rate of radial growth of colonies of Botrytis cinerea and Rhizopus stolonifer, providing further evidence that the potential mechanism of hypobaric treatment is induction of the defence system within the fruit rather than a direct effect on fungal viability. Further molecular and biochemical research is required to evaluate the possible stimulation of resistance in fruit through short-term hypobaric treatments.
Preharvest fungicide applications for postharvest control of Botrytis fruit rot were evaluated over four seasons on annual strawberry in Florida. In the 2002-2003 season, applications of Switch or Elevate immediately prior to harvest were ineffective for controlling Botrytis fruit rot postharvest. In the 2003-2004 season, applications of Captevate or Switch made immediately prior to harvest reduced postharvest Botrytis fruit rot, but not as much as applications made during the flowering period. Similarly, in the 2004-2005 season, Captevate and Pristine provided some control of postharvest Botrytis fruit rot when applied immediately before harvest. In both the 2003-2004 and 2004-2005 seasons, applications made during the flowering period were more effective for postharvest Botrytis fruit rot control than those made prior to harvest. In the 2006-2007 season, applications of Captevate, Thiram, Scala plus Captan, or Switch alternated with Captan during the flowering period provided good control of postharvest Botrytis fruit rot.
This article provides a state-of-the-art review of fungicides that are commonly used before harvest in conventional agriculture to prolong the storage of fresh commodities, and of the alternatives to fungicides recently made available for plant protection. Findings: Considering the high percentage of postharvest loss of fruit due to pathogen spoilage and the frequent development of pathogen isolates that are resistant to one or more active ingredients, alternatives to synthetic fungicides are needed. This review compares the current practices in conventional agriculture that are used to control postharvest rot of fruit with the alternatives to synthetic fungicides that are now available. The review summarizes the different fungicides and the corresponding alternatives, such as natural compounds, decontaminating agents that are 'generally recognized as safe', and biological control agents that have been applied in smallscale and large-scale tests. For some cultivated crops, including strawberries, table grapes, and stone and pome fruits, we include the time and method of application of preharvest treatments that can be applied to preserve fruit quality during storage. Limitations/implications: Even considering the research efforts in the search for alternatives to fungicides, at present there are few natural compounds that are as effective as fungicides. However, according to integrated pest management, to overcome the drawbacks that can arise with the use of a single strategy, an integration of methods might provide additive or synergistic effects for disease control. Directions for future research: Further insight at the molecular level into the interactions between host plants and chemicals applied will help us to better understand the changes that occur in host plants following treatments, or the effects of the treatments on the pathogens. This new knowledge will optimize the treatment application to provide the greatest effects with the minimum number/ time/ concentration of treatments applied.
Evaluation of the Effect of Chlorine Dioxide on Strawberries to Control Spoilage Micro-Organisms
Latin American Applied Research - An international journal, 2018
The objective of the present work was to evaluate the efficiency of chlorine dioxide to inhibit the growth of mesophilic bacteria, psychrotrophic bacteria and yeast and mold on strawberries compared to sanitizing sodium hypochlorite, currently the most widely used. The strawberries were treated with both sanitizers at a concentration of 100ppm and stored at temperatures of 15°C for 7 days or at 7°C for 25 days. The two sanitizers were effective in inhibiting the growth of micro-organisms tested, demonstrating that helped in increasing shelf life of strawberries. The chlorine dioxide showed in some tests, more efficient results than sodium hypochlorite, especially during the first few days of fruit storage. By the end of the tests, results were similar between them. Thus, results show that chlorine dioxide can replace sodium hypochlorite as a sanitizing of strawberries and that the control of the storage temperature is critical to enhance the fruit shelf life.
Antifungal activity of 2,5-dimethoxybenzoic acid on postharvest pathogens of strawberry fruits
Postharvest Biology and Technology, 1996
2,5-Dimethoxybenzoic (DMB) acid was tested as an antifungal compound to control the postharvest decay pathogens of strawberry fruits. The compound completely inhibited in vitro spore germination and mycelial growth of Botrytis cinerea and Rhizopus stolonifer at a concentration of 5 × 10 -3 M. The effect of DMB acid treatments on the decay of strawberry fruits, stored at 20°C or at 3°C plus a period of simulated shelf-life storage, was investigated. A marked reduction in decay development was observed when commercially harvested strawberries were dipped or sprayed with 10 -z M DMB acid. Its practical use on berries under field conditions has been also tested. The best results were obtained when fruits were dipped for 1 minute in 10 -2 DMB acid in combination with 0.05% (v/v) Tween 20.
Spanish journal of …, 2007
Strawberry (Fragaria x ananassa Duch.) is a nonclimateric fruit characterized by a short postharvest life, often estimated in less than 5 days. It is very prone to rapid dehydration, physiological disorders, bruising and other mechanical injuries, and to infections caused by several pathogens that can rapidly reduce quality of ripe fruits. These factors hinder to achieve export market and have limited strawberry production in Chile.
Postharvest Biology and Technology, 2000
The effect of pre-harvest sprays of chitosan on post-harvest decay and quality of strawberries stored at 3 and 13°C was investigated. Strawberry plants were sprayed with 2, 4 and 6 g l − 1 , chitosan solutions as the fruit were turning red. A second spray was performed after 10 days. Fruit were picked 5 and 10 days after each spray. Harvested fruit from chitosan sprayed plants were challenged with Botrytis cinerea. Chitosan sprays significantly reduced post-harvest fungal rot and maintained the keeping quality of the fruit compared with control. The incidence of decay decreased with increased chitosan concentration and increased with storage period and temperature. The second spray of chitosan extended the protective effect against decay of fruit from subsequent picks. Fruit from chitosan sprayed plants were firmer and ripened at a slower rate as indicated by anthocyanin content and titratable acidity than berries from non-treated plants. Chitosan sprays were not phytotoxic at all the concentrations tested. Chitosan sprays at 6 g l − 1 concentration performed twice, 10 days apart, protected the fruit from decay and kept the fruit quality at an acceptable level throughout the storage period of 4 weeks in fruit stored at 3°C. The protective effect of chitosan sprays was more pronounced for fruit from pick 1 than pick 2. Kinetic data on decay and ripening characteristics provided quantitative evidence that chitosan compensates for higher storage temperature and protects against deterioration of lower quality fruit from the second harvest.
Crop Protection, 2010
A protectant fungicide (Captan, a.i. captan) and a systemic fungicide (Switch, a.i. fludioxonil þ cyprodinil) were evaluated as pre-and post-inoculation applications for control of anthracnose fruit rot (AFR), caused by Colletotrichum acutatum, under a short (6 or 8 h) or long (18 or 24 h) wetting period. Evaluations were conducted for two seasons in Maryland and for two seasons in Florida. Both Captan and Switch were very effective for control of AFR when applied prior to inoculation, but control was more effective under the shorter wetting period. Switch was as effective when applied 4, 8, or 24 h postinoculation as when applied before inoculation, but control was better under the short wetting period. Captan was effective when applied 4 or 8 h after inoculation under the short wetting period, but was ineffective at 24 h post-inoculation. Post-inoculation sprays of Captan were ineffective at any time under the long wetting period. The post-infection activity of Switch allows greater flexibility for managing AFR when fungicide applications are scheduled based on weather-based decision-support systems.