期刊
SCIENTIA HORTICULTURAE
卷 225, 期 -, 页码 359-365出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scienta.2017.07.015
关键词
Bacillus; Biocontrol; Population dynamics; Temperature; Relative humidity; Rainfall
类别
资金
- European project BIOCOMES [FP7-612713]
- Secretaria d'Universitats i Recerca del Departament d'Economia i Coneixement de la Generalitat de Catalunya [2014-FI-B00367]
The biocontrol agent Bacillus amyloliquefaciens CPA-8 has been suggested as an effective alternative to chemical applications against brown rot caused by Monilinia spp. This study aimed to describe the population dynamics of CPA-8 on the surface of nectarines and peaches after being exposed to unfavourable environmental conditions. Two CPA-8-formulated products were obtained by fluid-bed spray-drying and then applied on fruit. Although both products included 20% sucrose plus 10% skimmed milk as protecting agents, they differ in the carrier material used during the formulation process: maltodextrin (CPA-8-formulated product called BA3) or potato starch (CPA-8-formulated product called BA4). CPA-8 has demonstrated wide tolerance to different factors such as, temperature, relative humidity and simulated rainfall. The minimal antagonist population obtained after exposure was generally higher than 10(4) CFO cm(-2) of fruit surface, which ensures high treatment coverture and therefore, efficacy. The results also indicated that peaches were, in general, more suitable for the CPA-8 survival than nectarines. Moreover, the properties of the two CPA-8-formulated products influenced the population dynamics of the bacterium, suggesting that the BA4 CPA-8-formulated product provided higher degree of ecological fitness of CPA-8 over the fruit than the BA3 CPA-8-formulated product. The data obtained in this work led us to conclude that the integration of these CPA-8-formulated products into cropping systems is a promising strategy to achieve higher levels of brown rot control and hence contribute to a successful handling of post-harvest diseases in stone fruit.
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