Identification, potential inoculum sources and pathogenicity of botryosphaeriaceous species associated with grapevine dieback disease in New Zealand

2011 ◽  
Vol 131 (3) ◽  
pp. 467-482 ◽  
Author(s):  
Nicholas T. Amponsah ◽  
E. Eirian Jones ◽  
Hayley J. Ridgway ◽  
Marlene V. Jaspers
Keyword(s):  
New Zealand ◽  
Inoculum Sources ◽  
Dieback Disease ◽  
Grapevine Dieback

Grape tendrils as an inoculum source of Botrytis cinerea in vineyards a review

2012 ◽  
Vol 65 ◽  
pp. 218-227 ◽  
Author(s):  
D.C. Mundy ◽  
R.H. Agnew ◽  
P.N. Wood
Keyword(s):  
New Zealand ◽  
Botrytis Cinerea ◽  
Wine Industry ◽  
Inoculum Sources ◽  
Inoculum Source ◽  
Major Disease ◽  
Wide Range ◽  
Bunch Rot ◽  
Considerable Damage

Botrytis cinerea is a fungus responsible for considerable damage to a wide range of crops worldwide including grapes Botrytis bunch rot caused by B cinerea is the major disease problem that must be managed by the New Zealand wine industry each season However the fungus is not easily managed as it can be both necrotrophic and saprophytic with a range of overwintering inoculum sources New Zealand grape growers have asked whether it is necessary to remove tendrils at the time of pruning in order to minimise botrytis bunch rot infection at harvest This review provides a summary of the information currently available on the importance of tendrils in the epidemiology of botrytis bunch rot under New Zealand conditions Gaps in knowledge and areas for further investigation are also identified

scholarly journals Assessing the effectiveness of oxathiapiprolin towards Phytophthora agathidicida, the causal agent of kauri dieback disease

FEMS Microbes ◽  
2021 ◽  
Author(s):  
Randy F Lacey ◽  
Michael J Fairhurst ◽  
Kaitlyn J Daley ◽  
Te Amohaere Ngata-Aerengamate ◽  
Haileigh R Patterson ◽  
...  
Keyword(s):  
Life Cycle ◽  
New Zealand ◽  
Mycelial Growth ◽  
Phytophthora Species ◽  
Effective Concentration ◽  
Dependent Manner ◽  
Life Cycle Stages ◽  
Leaf Infection ◽  
Dieback Disease ◽  
Dose Dependent

Abstract Phytophthora species cause disease and devastation of plants in ecological and horticultural settings worldwide. A recently identified species, P. agathidicida, infects and ultimately kills the treasured kauri trees (Agathis australis) that are endemic to New Zealand. Currently there are few options for managing kauri dieback disease. In this study, we sought to assess the toxicity of the oomycide oxathiapiprolin against several life cycle stages of two geographically distinct P. agathidicida isolates. The effective concentration to inhibit 50% of mycelial growth (EC50) was determined to be approximately 0.1 ng/ml, indicating that P. agathidicida mycelia are more sensitive to oxathiapiprolin than those from most other Phytophthora species that have been studied. Oxathiapiprolin was also highly effective at inhibiting the germination of zoospores (EC50 = 2–9 ng/ml for the two isolates) and oospores (complete inhibition at 100 ng/ml). In addition, oxathiapiprolin delayed the onset of detached kauri leaf infection in a dose-dependent manner. Collectively, the results presented here highlight the significant potential of oxathiapiprolin as a tool to aid in the control of kauri dieback disease.

Inoculum sources of Botryosphaeriaceae species in New Zealand grapevine nurseries

2012 ◽  
Vol 135 (1) ◽  
pp. 159-174 ◽  
Author(s):  
R. Billones-Baaijens ◽  
H. J. Ridgway ◽  
E. E. Jones ◽  
M. V. Jaspers
Keyword(s):  
New Zealand ◽  
Inoculum Sources ◽  
Botryosphaeriaceae Species

scholarly journals First report ofNeofusicoccum australe[Botryosphaeria australis], a cause of grapevine dieback in New Zealand

2009 ◽  
Vol 4 (1) ◽  
pp. 6 ◽  
Author(s):  
N. T. Amponsah ◽  
E. E. Jones ◽  
H. J. Ridgway ◽  
M. V. Jaspers
Keyword(s):  
New Zealand ◽  
First Report ◽  
Grapevine Dieback

scholarly journals Distribution of Botryosphaeria species causing grapevine dieback and decline in New Zealand vineyards

2008 ◽  
Vol 61 ◽  
pp. 392-392 ◽  
Author(s):  
J. Baskarathevan ◽  
M.V. Jaspers ◽  
E.E. Jones ◽  
H.J. Ridgway
Keyword(s):  
New Zealand ◽  
Type Species ◽  
Control Strategies ◽  
Climatic Conditions ◽  
Grapevine Variety ◽  
The North ◽  
Wide Range ◽  
Comprehensive Survey ◽  
Grapevine Dieback ◽  
Isolated Species

Worldwide 11 species of Botryosphaeria have been isolated from grapevines in association with a wide range of decline and dieback symptoms Currently there is little knowledge on what species are present in New Zealand A comprehensive survey was carried out during June to December 2007 to collect Botryosphaeria species from New Zealand vineyards More than 450 isolates including B parva B lutea B australis B stevensii B obtusa and B iberica were isolated from symptomatic material No correlation was observed between the species of Botryosphaeria and grapevine variety or age The highest incidence of Botryosphaeria species (977 ) was from Blenheim and lowest (164 ) was from Otago The most commonly isolated species was B parva followed by B stevensii Fusicoccum type Botryosphaeria species such as B parva and B lutea were more prevalent in the North Island and Diplodia type species including B stevensii and B obtusa dominated in the South Island It is likely that the Botryosphaeria species distribution in New Zealand is influenced by climatic conditions This information has implications for development of control strategies

Evaluation of fungicide efficacy against Neofusicoccum species causing dieback disease of blueberries in New Zealand

2018 ◽  
Vol 48 (1) ◽  
pp. 75-84 ◽  
Author(s):  
K. M. S. Tennakoon ◽  
Hayley J. Ridgway ◽  
Marlene V. Jaspers ◽  
Geoff Langford ◽  
E. Eirian Jones
Keyword(s):  
New Zealand ◽  
Fungicide Efficacy ◽  
Dieback Disease

Infection criteria, inoculum sources and splash dispersal pattern of Colletotrichum acutatum causing bitter rot of apple in New Zealand

2018 ◽  
Vol 152 (2) ◽  
pp. 367-383 ◽  
Author(s):  
K. R. Everett ◽  
I. P. S. Pushparajah ◽  
O. E. Timudo ◽  
A. Ah Chee ◽  
R. W. A. Scheper ◽  
...  
Keyword(s):  
New Zealand ◽  
Colletotrichum Acutatum ◽  
Dispersal Pattern ◽  
Inoculum Sources ◽  
Bitter Rot ◽  
Splash Dispersal

scholarly journals Assessing the effectiveness of oxathiapiprolin towards Phytophthora agathidicida, the causal agent of kauri dieback disease

2021 ◽  
Author(s):  
Randy F. Lacey ◽  
Michael J. Fairhurst ◽  
Kaitlyn J. Daley ◽  
Te Amohaere Ngata-Aerengamate ◽  
Haileigh R. Patterson ◽  
...  
Keyword(s):  
New Zealand ◽  
Mycelial Growth ◽  
Effective Concentration ◽  
Complete Inhibition ◽  
Dependent Manner ◽  
Significant Potential ◽  
Leaf Infection ◽  
Half Maximal Effective Concentration ◽  
Dieback Disease ◽  
Dose Dependent

AbstractPhytophthora species cause disease and devastation of plants in ecological and horticultural settings worldwide. A recently identified species, P. agathidicida, infects and ultimately kills the treasured kauri trees that are endemic to New Zealand. Currently there are few options for controlling or treating P. agathidicida. In this study, we sought to assess the toxicity of the oomycide oxathiapiprolin against several lifecycle stages of two geographically distinct P. agathidicida isolates. Half maximal effective concentration (EC50) values were determined to be approximately 0.1 ng/ml for inhibiting mycelial growth, indicating that P. agathidicida mycelia are more sensitive to oxathiapiprolin than those from most other Phytophthora species that have been studied. Oxathiapiprolin was also highly effective at inhibiting the germination of zoospores (EC50 = 2-9 ng/ml for the two isolates) and oospores (complete inhibition at 100 ng/ml). In addition, oxathiapiprolin delayed the onset of detached kauri leaf infection in a dose-dependent manner. Collectively, the results presented here highlight the significant potential of oxathiapiprolin as a tool to aid in the control of kauri dieback disease.

scholarly journals Preliminary investigations of the risk of plant debris as a Pseudomonas syringae pv actinidiae inoculum source

2016 ◽  
Vol 69 ◽  
pp. 11-16
Author(s):  
J.L. Tyson ◽  
C.L. Curtis ◽  
M.A. Manning ◽  
S.J. Dobson ◽  
C.E. McKenna
Keyword(s):  
New Zealand ◽  
Pseudomonas Syringae ◽  
Causal Agent ◽  
Plant Debris ◽  
Inoculum Sources ◽  
Inoculum Source ◽  
Trap Plants ◽  
Fallen Leaves ◽  
Rain Events

In New Zealand the causal agent of kiwifruit canker Pseudomonas syringae pv actinidiae (Psa) can survive in overwintered kiwifruit plant debris on the orchard floor at least until spring This study used trap plates and trap plants to determine the importance of fallen leaves and winter prunings on the orchard floor as inoculum sources Trap plates were positioned 15 50 and 100 cm above the debris Psa was detected only when the plates were exposed during rain events and was found to be splashed upwards in small amounts from the debris during rain Leaf lesions developed only on the trap plants exposed during the first week of the 20week trial In this trial there is some evidence that plant debris is not a significant inoculum source and would not have posed a major risk for reinfection of any surrounding kiwifruit vines at the time of budburst in spring

Magellanic Cloud Eclipsing Binaries: Primary Distance Indicators

1999 ◽  
Vol 190 ◽  
pp. 563-566
Author(s):  
J. D. Pritchard ◽  
W. Tobin ◽  
J. V. Clausen ◽  
E. F. Guinan ◽  
E. L. Fitzpatrick ◽  
...  
Keyword(s):  
New Zealand ◽  
Magellanic Cloud ◽  
Eclipsing Binaries ◽  
Fundamental Parameters ◽  
Distance Indicators

Our collaboration involves groups in Denmark, the U.S.A. Spain and of course New Zealand. Combining ground-based and satellite (IUEandHST) observations we aim to determine accurate and precise stellar fundamental parameters for the components of Magellanic Cloud Eclipsing Binaries as well as the distances to these systems and hence the parent galaxies themselves. This poster presents our latest progress.

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