scholarly journals Botrytis cinerea control on Sauvignon blanc using a recycling sprayer

2012 ◽  
Vol 65 ◽  
pp. 249-255
Author(s):  
V. Raw ◽  
D.C. Mundy ◽  
A.R.G McLachlan ◽  
C. Clifford ◽  
M. Walter
Keyword(s):  
New Zealand ◽  
Disease Control ◽  
Botrytis Cinerea ◽  
Wine Industry ◽  
Target Area ◽  
Economic Threshold ◽  
Control Efficacy ◽  
Sauvignon Blanc ◽  
Bunch Rot ◽  
Excellent Coverage

The New Zealand wine industry is strongly committed to sustainable production The SprayPro Rseries sprayer is designed to recycle unused chemical sprays not deposited on the target area Sauvignon blanc vines in Marlborough New Zealand were studied during 2011/2012 The vineyard area was 5 ha at 80 flowering where the full canopy was sprayed and 10 ha at pre bunch closure (PBC) targeting the fruiting zone only Disease control efficacy of spray recycling was investigated using Botrytis cinerea as the model pathogen Pathogen colonisation of necrotic leaf discs placed in the canopy at 80 flowering and PBC showed even control of B cinerea At PBC 80 of the watersensitive papers had adequate to excellent coverage Botrytis bunch rot incidence and severity were evenly expressed throughout the block but increased during preharvest; severity was well below the 3 economic threshold Recycling of botryticides did not affect disease control

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 Disease assessment and epidemic monitoring methodology for bunch rot (Botrytis cinerea) in grapevines

2006 ◽  
Vol 59 ◽  
pp. 355-360 ◽  
Author(s):  
R.M. Beresford ◽  
K.J. Evans ◽  
P.N. Wood ◽  
D.C. Mundy
Keyword(s):  
New Zealand ◽  
Linear Regression ◽  
Botrytis Cinerea ◽  
Prediction Models ◽  
Disease Assessment ◽  
Critical Comparison ◽  
Epidemic Monitoring ◽  
Increase Rate ◽  
Quantitative Analyses ◽  
Bunch Rot

Epidemic descriptors that quantified the location in time and rate of disease increase of botrytis bunch rot were developed using percentage disease severity data Data were obtained from fungicide evaluation trials in three regions of New Zealand and from Tasmania in Australia Mean percentage severity versus time was logit transformed and linear regression was used to predict the date at which 5 severity was reached the daily severity increase rate at 5 severity the severity on the date of harvest and the daily severity increase rate at harvest These descriptors will be of general use for the critical comparison of bunch rot epidemics between sites and between seasons They will be used in quantitative analyses to identify factors that drive botrytis bunch rot epidemics in order to develop botrytis prediction models

scholarly journals Sensitivity of Botrytis cinerea to fungicides used in New Zealand wine grape spray programmes

2017 ◽  
Vol 70 ◽  
pp. 285-294
Author(s):  
R.M. Beresford ◽  
P.J. Wright ◽  
C.L. Middleditch ◽  
M. Vergara ◽  
L. Hasna ◽  
...  
Keyword(s):  
New Zealand ◽  
Botrytis Cinerea ◽  
High Sensitivity ◽  
Cross Resistance ◽  
Baseline Sensitivity ◽  
Resistance Development ◽  
Low Degree ◽  
Medium Resistance ◽  
Bunch Rot ◽  
Succinate Dehydrogenase Inhibitor

Fungicide resistance development in Botrytis cinerea threatens the efficacy of anilinopyrimidine (AP) fungicides, which have been used for botrytis bunch rot control in New Zealand vineyards for about 20 years. A 2016 survey of 33 vineyards in Gisborne, Hawke's Bay and Marlborough showed that the majority of 670 isolates tested in agar-based assays were sensitive to the AP cyprodinil (EC50 < 1 mg/litre), although 18% showed low-resistance (EC50 1-10 mg/litre) and 10% showed medium-resistance (EC50 >10 mg/litre). There was high cross-resistance to the APs cyprodinil and pyrimethanil. The survey also established baseline sensitivity to the succinate dehydrogenase inhibitor (SDHI) fungicide boscalid and >90% of isolates were sensitive (EC50 < 5 mg/litre). There was a low degree of cross-resistance between the SDHIs boscalid and fluopyram. There was also high sensitivity to fludioxonil (0.009 to 0.018 mg/litre) and to fenhexamid (0.49 to 0.76 mg/litre).

scholarly journals Aroma and Sensory Profiles of Sauvignon Blanc Wines from Commercially Produced Free Run and Pressed Juices

Beverages ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 29
Author(s):  
Katie Parish-Virtue ◽  
Mandy Herbst-Johnstone ◽  
Flo Bouda ◽  
Bruno Fedrizzi ◽  
Rebecca C. Deed ◽  
...  
Keyword(s):  
New Zealand ◽  
Chemical Composition ◽  
Benzyl Alcohol ◽  
Sensory Analysis ◽  
Wine Industry ◽  
Hexyl Acetate ◽  
Sauvignon Blanc ◽  
Grape Cultivar ◽  
Aroma Chemical ◽  
Sensory Profiles

Sauvignon blanc is the most important grape cultivar within the New Zealand wine industry, and wines from the Marlborough region are renowned for their intense aromas including tropical, passionfruit, and green capsicum. Quality Sauvignon blanc wines are usually made from free run juice, although press fractions can be included. The chemical aroma composition and sensory profiles of two wine sets made from three press fractions (free run, light press and heavy press) were compared. The compounds 3-mercaptohexan-1-ol and 3-mercaptohexyl acetate were found to decrease between free run and heavily pressed wines while hexyl acetate, hexanol, and benzyl alcohol increased. The accompanying sensory analysis showed that free run wines were marked by aromas of Passionfruit/sweaty, Boxwood and Fresh green capsicum, while the heavy pressed wines were described by French vanilla/bourbon, Floral and Banana lolly attributes, consistent with the aroma chemical composition.

scholarly journals Mini munchers to control powdery mildew and botrytis bunch rot in grapes

2010 ◽  
Vol 63 ◽  
pp. 279-279
Author(s):  
K.S.H. Boyd-Wilson ◽  
S. Read ◽  
D.C. Mundy
Keyword(s):  
New Zealand ◽  
Disease Management ◽  
Powdery Mildew ◽  
Production Systems ◽  
Growing Season ◽  
Wine Industry ◽  
Wine Production ◽  
Apple Leaves ◽  
Bunch Rot ◽  
Organic Wine

The use of mycophagous (fungal feeding) invertebrates has potential to contribute to disease management in both organic and conventional wine production systems in New Zealand The New Zealand wine industry is actively working towards producing ultralow residue wines This involves removing all late season botrytis fungicide sprays from the vineyard spray programme In organic wine production systems in New Zealand the only products available to control powdery mildew and botrytis bunch rot are protectants In both these systems when fungicides are not available mycophagous invertebrates may reduce the amount of inoculum available to cause disease A survey of leaf material in 19 vineyards in Canterbury and Marlborough over the 20082009 growing season identified populations of beetles in two vineyards in sufficient numbers to justify further research In the laboratory fieldcollected beetles that were starved for 2 days fed on spores of Botrytis cinerea (botrytis bunch rot) growing on blackcurrant flowers Podosphaerea leucotricha (apple powdery mildew) on apple leaves and Erysiphe necator (grape powdery mildew) on grape leaves Beetles were identified as Aridius bifaciatus (Reitter) A nodifer (Westwood) and Cortinicara hirtalis (Broun)

scholarly journals A synthetic agar assay for determining sensitivity of Venturia inaequalis to anilinopyrimidine fungicides in New Zealand apple orchards

2013 ◽  
Vol 66 ◽  
pp. 293-302 ◽  
Author(s):  
N.J. Larsen ◽  
R.M. Beresford ◽  
P.N. Wood ◽  
P.J. Wright ◽  
B.M. Fisher
Keyword(s):  
New Zealand ◽  
Disease Control ◽  
Botrytis Cinerea ◽  
Mycelial Growth ◽  
Venturia Inaequalis ◽  
Black Spot ◽  
Apple Trees ◽  
Colony Diameter ◽  
Growth Assay ◽  
Agar Method

A synthetic agar mycelial growth assay adapted from a Botrytis cinerea method was used to determine the sensitivity of Venturia inaequalis isolates (the cause of apple black spot) to anilinopyrimidine (AP) fungicides Nineteen singleconidium isolates were classified as sensitive (S) or resistant (R) to cyprodinil or pyrimethanil after 21 days growth according to concentrations that inhibited colony diameter by 50 (EC50) Isolate classification on agar was compared with leaf disease control by AP fungicides on potted apple trees inoculated with S or R isolates Three S isolates were completely inhibited by AP fungicides on plants Three R isolates were partially inhibited on fungicidetreated leaves One isolate classified as R for both fungicides on agar was inhibited by cyprodinil but not pyrimethanil on plants The agar method will be used for screening V inaequalis populations for AP resistance in orchard surveys with plant tests on some isolates to determine implications for orchard disease control

scholarly journals Comparison of sampling procedures for estimating botrytis bunch rot incidence in New Zealand vineyards

2012 ◽  
Vol 65 ◽  
pp. 241-248 ◽  
Author(s):  
A.H. McKay ◽  
G.N. Hill ◽  
R.M. Beresford
Keyword(s):  
New Zealand ◽  
Disease Incidence ◽  
Wine Industry ◽  
Management Decision ◽  
Cluster Sampling ◽  
Inverse Sampling ◽  
Sample Number ◽  
Bunch Rot ◽  
Low Incidence ◽  
Sampling Procedures

Quantifying botrytis bunch rot (BBR) in vineyards is essential to the New Zealand wine industry Simple random sampling (SRS) inverse sampling (IS) and adaptive cluster sampling (ACS) were compared using simulated disease incidence at two levels (1 and 3) three clustering factors (random low and high) and small (100 bays) or large (2500 bays) vineyard sizes Sampling relative efficiency (re) was highest using ACS when disease was highly clustered at low incidence Inverse sampling was investigated by repeatedly sampling from the simulated vineyards which resulted in total sample number and variance of IS being greatest in highly clustered BBR at low incidence IS resulted in a lower final sample number with less variance than ACS using simulated BBR that was randomly dispersed at 3 IS or SRS using a sample size calculated from desired sample confidence can provide practical and accurate botrytis bunch rot sampling for disease management decision support

scholarly journals Effects of mechanical thinning on botrytis bunch rot on Sauvignon blanc wine grapes

2021 ◽  
Vol 74 (1) ◽  
pp. 30-36
Author(s):  
Dion C. Mundy ◽  
Michael C.T. Trought ◽  
Andrew R.G. McLachlan ◽  
Susan M. Neal ◽  
Dominic Pecchenino
Keyword(s):  
Botrytis Cinerea ◽  
Disease Severity ◽  
Disease Risk ◽  
Cost Effective ◽  
Sauvignon Blanc ◽  
Susceptibility To Infection ◽  
Mechanical Thinning ◽  
Bunch Rot ◽  
Disease Pressure ◽  
Heavy Machine

Mechanical fruit thinning could be a practical and cost-effective alternative to hand thinning of Sauvignon blanc grapes to increase quality by reducing yield. Botrytis bunch rot, caused by the fungus Botrytis cinerea, is the main seasonal disease risk for grapes grown in New Zealand but it is unknown if this disease is exacerbated by mechanical rather than manual thinning of the vines. It was hypothesised that the damage caused by mechanical thinning would result in more disease or increase disease pressure than hand thinning or no thinning. Botrytis bunch rot was determined in the field at harvest following mechanical thinning in the 2009, 2010 and 2011 seasons compared with an un-thinned control. In the 2011 season, possible mechanisms that may have influenced disease severity were investigated. The parameters investigated were: bunch openness; berry susceptibility to infection; and percentage of bunch debris infected with Botrytis cinerea. Mechanical thinning resulted in the same or lower observed disease severity compared with the un-thinned control in the 2009, 2010 and 2011 seasons while reducing yield as desired. In all seasons, both heavy and light machine thinning treatments reduced incidence of botrytis compared to the un-thinned control and the heavy machine treatment always reduced disease severity compared to the un-thinned control. Berry susceptibility to Botrytis cinerea was a complex interaction between various factors. Heavy machine thinned berries without wounding and inoculation were significantly less susceptible than the un-thinned control. Further investigation will be required to determine if the significant differences observed in berry susceptibility to infection and total infected bunch debris per bunch can be correlated with observed field disease levels.

Effect of a protectant copper application on Psa infection of kiwifruit trap plants

2017 ◽  
Vol 70 ◽  
pp. 310-314
Author(s):  
J.L. Tyson ◽  
S.J. Dobson ◽  
M.A. Manning
Keyword(s):  
New Zealand ◽  
Disease Control ◽  
Pseudomonas Syringae ◽  
Low Risk ◽  
Bacterial Canker ◽  
Complete Protection ◽  
Leaf Spots ◽  
Copper Compounds ◽  
Trap Plants

Pseudomonas syringae pv. actinidiae (Psa) causes bacterial canker of kiwifruit, which is an ongoing threat to New Zealand kiwifruit production. Disease control depends on orchard practices such as removal of visibly diseased material, pruning during low-risk periods, and the application of foliar bactericides. Although the use of copper compounds on Actinidia species (kiwifruit) can cause phytotoxicity, copper-based formulations remain a key component of Psa control in New Zealand. The effect of single copper applications on Psa infection of ‘Hort16A’ trap plants was studied over the Spring of 2014 (Sept—Nov). Psa leaf spots were observed at the beginning of October, appearing first on the untreated plants. Although the copper sprays did not achieve complete protection, particularly as the inoculum built up during November, the copper-sprayed plants always had less disease than the untreated plants.

Sign in / Sign up

Export Citation Format

Share Document