Articles
Anticipating an incursion by the grape pathogen, Guignardia bidwellii
Article number
1451_28
Pages
193 – 198
Language
English
Abstract
The fungus Guignardia bidwellii (black rot) causes a pre- and postharvest disease of grapes (Vitis spp.). When infected berries are inadvertently mixed with healthy berries, the resultant wine develops unpleasant off-flavours.
Black rot is native to North America, and from there has spread to Europe, Central and South America, Asia, Africa and Australasia (New South Wales and Christmas Island). Black rot has probably been spread around the world in grape cuttings and rootstocks but can also contaminate micropropagated plants and fresh grape berries.
Alternative hosts produced as nursery plants could also provide entry points, such as Asplenium nidus (bird’s nest fern) and Pathenocissus tricuspidate (Boston ivy). An integrated biosecurity risk assessment model (IBRAM) has been developed to evaluate the risk of establishment and dispersal of invasive species along trade pathways.
This model has previously been used for insect pests (IBRAM-pest) and has now been adapted to model risk for plant pathogens (IBRAM-path). IBRAM-path was tested in a proof-of-concept study to evaluate its usefulness for assessing risk of incursion of a postharvest pathogen, G. bidwellii, through different pathways into Aotearoa/New Zealand.
The algorithms were able to be adapted to derive sensible outcomes for estimating the risk of incursion of G. bidwellii with and without current measures executed by border authorities.
The impact of climate change on incursions by G. bidwellii into New Zealand was estimated to be negligible.
Black rot is native to North America, and from there has spread to Europe, Central and South America, Asia, Africa and Australasia (New South Wales and Christmas Island). Black rot has probably been spread around the world in grape cuttings and rootstocks but can also contaminate micropropagated plants and fresh grape berries.
Alternative hosts produced as nursery plants could also provide entry points, such as Asplenium nidus (bird’s nest fern) and Pathenocissus tricuspidate (Boston ivy). An integrated biosecurity risk assessment model (IBRAM) has been developed to evaluate the risk of establishment and dispersal of invasive species along trade pathways.
This model has previously been used for insect pests (IBRAM-pest) and has now been adapted to model risk for plant pathogens (IBRAM-path). IBRAM-path was tested in a proof-of-concept study to evaluate its usefulness for assessing risk of incursion of a postharvest pathogen, G. bidwellii, through different pathways into Aotearoa/New Zealand.
The algorithms were able to be adapted to derive sensible outcomes for estimating the risk of incursion of G. bidwellii with and without current measures executed by border authorities.
The impact of climate change on incursions by G. bidwellii into New Zealand was estimated to be negligible.
Authors
K.R. Everett, O. Woodberry, M. Ormsby, T. Moore, L.E. Jamieson, N. Williams
Keywords
Vitis vinifera, black rot, pathways, biosecurity, incursion, risk, model, Bayesian networks
Online Articles (37)