The use of biological control to decrease the presence of Monilinia spp. in post-harvest conditions

03 Oct 2024
830

Monilinia spp. is the micro-organism responsible for the disease known as stone fruit brown rot, which can cause considerable economic losses. Until now, the most common way of dealing with crop diseases has been the extensive use of synthetic chemical pesticides, which pose a risk to both human health and the environment.

Although these substances have high antimicrobial power, their use is becoming increasingly restricted due to European regulations, which has led to the need to look for new, equally effective solutions for disease control. One such option is biocontrol, which uses antagonistic agents or metabolites generated by them to block the spread of unwanted organisms.

For example, the genus Bacillus is characterised by its remarkable ability to produce spores, stimulate plant growth and generate antifungal effects through the synthesis and release of various secondary metabolites. The aim of the research conducted at the University of Zaragoza (Spain) was to analyse the impact of pre- and post-harvest application of Bacillus velezensis BUZ-14 as an alternative to tebuconazole to combat the growth of Monilinia spp. on Brooks cherries.

The study was conducted in a 4.1 ha cherry orchard of the Brooks variety, located in the town of Albalate de Cinca, Spain. The cherry orchard had a planting system of 4 m x 2 m and a branched-axis training system. Irrigation was made by over-canopy sprinklers and lasted 11 days in the pre-harvest period and 22 days after harvest.

To analyse the effectiveness of pre-harvest treatments on disease control during post-harvest storage of the cherries, a shelf-life study was conducted for 10 days under refrigerated conditions at 1ºC, followed by a 2-day marketing simulation period at 20ºC. During this study, the presence of fungal diseases and the marketable quality of the fruit was assessed both at the time of release from refrigeration and after the marketing simulation period.

At the beginning of the shelf-life study, all batches were disinfected with a sodium hypochlorite solution (100 ppm) at a temperature of 4°C. This cleaning procedure was performed with a cleaning machine. The fruits were then stored for 10 days at a temperature of 1°C and a relative humidity of 98%.

After 10 days of cold storage, it was observed that the group of cherries treated with synthetic fungicide (tebuconazole) in the field showed a higher rate of rotting, reaching 16% of the total, compared to the group treated with the agent BUZ-14, which showed an infection rate of 3.5%.

The biological formulation containing the control agent BUZ-14 can stimulate the natural defence system of the plant and its fruit. This is also demonstrated by the increase in the concentration of total phenolic compounds and peroxidase enzyme activity observed in the treated samples. Furthermore, it was noted that fruits treated with BUZ-14 retained their physico-chemical quality more effectively, maintaining significant attributes such as flesh firmness at high levels.

Source: Desafíos en maduracíon y postcosecha de frutos y hortalizas (Madrid 2024)
Image: SL Fruit Service

Melissa Venturi
University of Bologna (IT)


Cherry Times - All rights reserved

What to read next

Protective effects of anthocyanin-rich Amarena cherry extracts (Rio variety) in cellular and animal models of neurodegeneration

Health

23 Jun 2023

It has been proposed that sour cherries may exert several potentially beneficial effects on health. The neuroprotective potential of the extracts was evaluated using the toxicity induced by the neurotoxin Rotenone (ROT) in a cellular model of Parkinson's disease (PD).

Impact of the weather: rain and temperatures create difficulties for the Chilean season

Markets Quality

13 Nov 2023

Expectations were to reach 100 million boxes, but according to Claudio Araya, agricultural manager of Frutera San Fernando, thanks to weather and logistics, 85 million boxes will be reached, slightly more than last year's season.

In evidenza

New Picota cherries from Spain: less pit, more quality and stem-free harvest

Breeding

17 Sep 2025

In Spain’s Jerte Valley, new Picota cherry cultivars enhance fruit quality, reduce pit size, and support stem-free harvesting. A recent study identifies four promising genotypes with commercial size, shelf-life resistance, and post-harvest performance in MAP.

Results of Armonigro treatments on cherry and nectarine trees in Aconcagua Valley, Chile

Tech management

17 Sep 2025

Field trials tested Armonigro on Brooks and Santina cherry trees and May Glo nectarines in Chile’s Aconcagua Valley. The treatments aimed to improve yield and fruit size under adverse climatic conditions, including low chill hours and irregular bud development.

Tag Popolari