期刊
JOURNAL OF FUNGI
卷 8, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/jof8040409
关键词
Vitis vinifera; biocontrol; Trichoderma; grapevine trunk diseases; botryosphaeria dieback; Diplodia seriata; Neofusicoccum parvum; translation elongation factor one alpha
资金
- British Columbia Wine Grape Council
- Agriculture and Agri-Food Canada
- Canadian Grapevine Certification Network
This study identified several Trichoderma species from grapevines in British Columbia and evaluated their biocontrol activity against BD fungi. The results showed that these isolates were able to significantly inhibit the growth of fungal pathogens and provide protection for pruning wounds for up to 21 days. They also exhibited similar or better control compared to commercial products.
Botryosphaeria dieback (BD) is a grapevine trunk disease (GTD) causing significant yield losses and limiting the lifespan of vineyards worldwide. Fungi responsible for BD infect grapevines primarily through pruning wounds, and thus pruning wound protection, using either synthetic chemicals or biological control agents (BCAs), is the main available management strategy. However, no products to control GTDs are currently registered in Canada. With a focus on more sustainable grapevine production, there is an increasing demand for alternatives to chemical products to manage GTDs. Accordingly, the objective of this study was to identify Trichoderma species from grapevines in British Columbia (BC) and evaluate their potential biocontrol activity against BD fungi Diplodia seriata and Neofusicoccum parvum. Phylogenetic analyses identified seven species, including T. asperelloides, T. atroviride, T. harzianum, T. koningii, T. tomentosum, and two novel species, T. canadense and T. viticola. In vitro dual culture antagonistic assays showed several isolates to inhibit fungal pathogen mycelial growth by up to 75%. In planta detached cane assays under controlled greenhouse conditions identified T. asperelloides, T. atroviride and T. canadense isolates from BC as providing 70% to 100% pruning wound protection against BD fungi for up to 21 days after treatment. In addition, these isolates were shown to provide similar or better control when compared against commercial chemical and biocontrol products. This study demonstrates the potential that locally sourced Trichoderma species can have for pruning wound protection against BD fungi, and further supports the evaluation of these isolates under natural field conditions.
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