Ripe rot of south eastern Australian wine grapes is caused by two species of Colletotrichum: C. acutatum and C. gloeosporioides with differences in infection and fungicide sensitivity

Lindsay Greer, John Harper, Sandra Savocchia, Suren Samuelian, Christopher Steel

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12 Citations (Scopus)

Abstract

Background and Aims: Ripe rot of grapes is widespread in subtropical vineyards of south-eastern Australia. We aimed to re-evaluate the causative agent(s), berry susceptibility, fungicide sensitivity and differences in histopathology.Methods and Results: Both Colletotrichum acutatum and C. gloeosporioides were shown to be responsible for ripe rot in three vineyards surveyed in the Hastings Valley, NSW in 2007 and 2009. Observation on detached berries of Vitis vinifera (cv. Cabernet Sauvignon and Chardonnay) revealed that C. acutatum had a faster infection rate than C. gloeosporioides. C. acutatum also formed appressoria and penetrated grape tissue faster than C. gloeosporioides, which produced longer hyphae on the berry surface before penetration. Both C. acutatum and C. gloeosporioides produced acervuli 48 h after inoculation. In contrast, spore germination rates and growth rates on potato dextrose agar were greater for C. gloeosporioides. The two species differed in their sensitivity to the fungicides benomyl, captan and triadimenol. C. acutatum was significantly more sensitive to captan and triadimenol, whereas C. gloeosporioides was more sensitive to benomyl.Conclusions: Both C. acutatum and C. gloeosporioides cause ripe rot of wine grapes in Australia. Subtle differences in the infection process may explain the relative prevalence of the two species.Significance of the Study: This study confirms the involvement of C. acutatum and C. gloeosporioides in ripe rot of grapes in Australia. Knowledge of growth characteristics and fungicide sensitivity of ripe rot pathogens should aid disease management strategies.
Original languageEnglish
Pages (from-to)123-128
Number of pages6
JournalAustralian Journal of Grape and Wine Research
Volume17
Issue number2
Publication statusPublished - Jun 2011

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Colletotrichum acutatum
wine grapes
Colletotrichum
Glomerella cingulata
fungicides
infection
triadimenol
small fruits
grapes
captan
benomyl
vineyards
fungicide resistance
appressoria
spore germination
Vitis vinifera
histopathology
hyphae
disease control
valleys

Cite this

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title = "Ripe rot of south eastern Australian wine grapes is caused by two species of Colletotrichum: C. acutatum and C. gloeosporioides with differences in infection and fungicide sensitivity",
abstract = "Background and Aims: Ripe rot of grapes is widespread in subtropical vineyards of south-eastern Australia. We aimed to re-evaluate the causative agent(s), berry susceptibility, fungicide sensitivity and differences in histopathology.Methods and Results: Both Colletotrichum acutatum and C. gloeosporioides were shown to be responsible for ripe rot in three vineyards surveyed in the Hastings Valley, NSW in 2007 and 2009. Observation on detached berries of Vitis vinifera (cv. Cabernet Sauvignon and Chardonnay) revealed that C. acutatum had a faster infection rate than C. gloeosporioides. C. acutatum also formed appressoria and penetrated grape tissue faster than C. gloeosporioides, which produced longer hyphae on the berry surface before penetration. Both C. acutatum and C. gloeosporioides produced acervuli 48 h after inoculation. In contrast, spore germination rates and growth rates on potato dextrose agar were greater for C. gloeosporioides. The two species differed in their sensitivity to the fungicides benomyl, captan and triadimenol. C. acutatum was significantly more sensitive to captan and triadimenol, whereas C. gloeosporioides was more sensitive to benomyl.Conclusions: Both C. acutatum and C. gloeosporioides cause ripe rot of wine grapes in Australia. Subtle differences in the infection process may explain the relative prevalence of the two species.Significance of the Study: This study confirms the involvement of C. acutatum and C. gloeosporioides in ripe rot of grapes in Australia. Knowledge of growth characteristics and fungicide sensitivity of ripe rot pathogens should aid disease management strategies.",
keywords = "Glomerella cingulata, Histopathology, Non-Botrytis bunch rot, Vitis vinifera",
author = "Lindsay Greer and John Harper and Sandra Savocchia and Suren Samuelian and Christopher Steel",
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language = "English",
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pages = "123--128",
journal = "Australian Journal of Grape and Wine Research",
issn = "1322-7130",
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T1 - Ripe rot of south eastern Australian wine grapes is caused by two species of Colletotrichum

T2 - C. acutatum and C. gloeosporioides with differences in infection and fungicide sensitivity

AU - Greer, Lindsay

AU - Harper, John

AU - Savocchia, Sandra

AU - Samuelian, Suren

AU - Steel, Christopher

N1 - Imported on 12 Apr 2017 - DigiTool details were: month (773h) = June, 2011; Journal title (773t) = Australian Journal of Grape and Wine Research. ISSNs: 1322-7130;

PY - 2011/6

Y1 - 2011/6

N2 - Background and Aims: Ripe rot of grapes is widespread in subtropical vineyards of south-eastern Australia. We aimed to re-evaluate the causative agent(s), berry susceptibility, fungicide sensitivity and differences in histopathology.Methods and Results: Both Colletotrichum acutatum and C. gloeosporioides were shown to be responsible for ripe rot in three vineyards surveyed in the Hastings Valley, NSW in 2007 and 2009. Observation on detached berries of Vitis vinifera (cv. Cabernet Sauvignon and Chardonnay) revealed that C. acutatum had a faster infection rate than C. gloeosporioides. C. acutatum also formed appressoria and penetrated grape tissue faster than C. gloeosporioides, which produced longer hyphae on the berry surface before penetration. Both C. acutatum and C. gloeosporioides produced acervuli 48 h after inoculation. In contrast, spore germination rates and growth rates on potato dextrose agar were greater for C. gloeosporioides. The two species differed in their sensitivity to the fungicides benomyl, captan and triadimenol. C. acutatum was significantly more sensitive to captan and triadimenol, whereas C. gloeosporioides was more sensitive to benomyl.Conclusions: Both C. acutatum and C. gloeosporioides cause ripe rot of wine grapes in Australia. Subtle differences in the infection process may explain the relative prevalence of the two species.Significance of the Study: This study confirms the involvement of C. acutatum and C. gloeosporioides in ripe rot of grapes in Australia. Knowledge of growth characteristics and fungicide sensitivity of ripe rot pathogens should aid disease management strategies.

AB - Background and Aims: Ripe rot of grapes is widespread in subtropical vineyards of south-eastern Australia. We aimed to re-evaluate the causative agent(s), berry susceptibility, fungicide sensitivity and differences in histopathology.Methods and Results: Both Colletotrichum acutatum and C. gloeosporioides were shown to be responsible for ripe rot in three vineyards surveyed in the Hastings Valley, NSW in 2007 and 2009. Observation on detached berries of Vitis vinifera (cv. Cabernet Sauvignon and Chardonnay) revealed that C. acutatum had a faster infection rate than C. gloeosporioides. C. acutatum also formed appressoria and penetrated grape tissue faster than C. gloeosporioides, which produced longer hyphae on the berry surface before penetration. Both C. acutatum and C. gloeosporioides produced acervuli 48 h after inoculation. In contrast, spore germination rates and growth rates on potato dextrose agar were greater for C. gloeosporioides. The two species differed in their sensitivity to the fungicides benomyl, captan and triadimenol. C. acutatum was significantly more sensitive to captan and triadimenol, whereas C. gloeosporioides was more sensitive to benomyl.Conclusions: Both C. acutatum and C. gloeosporioides cause ripe rot of wine grapes in Australia. Subtle differences in the infection process may explain the relative prevalence of the two species.Significance of the Study: This study confirms the involvement of C. acutatum and C. gloeosporioides in ripe rot of grapes in Australia. Knowledge of growth characteristics and fungicide sensitivity of ripe rot pathogens should aid disease management strategies.

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KW - Vitis vinifera

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EP - 128

JO - Australian Journal of Grape and Wine Research

JF - Australian Journal of Grape and Wine Research

SN - 1322-7130

IS - 2

ER -