Effects of Canola Oil and Jojoba Wax Sprays on Powdery Mildew, Bunch Rot, and Vine Performance of ‘Auxerrois’ and ‘Riesling’ Grapevines

2005 ◽  
Vol 4 (4) ◽  
pp. 49-72
Author(s):  
Andrew G. Reynolds
Keyword(s):  
Powdery Mildew ◽  
Canola Oil ◽  
Jojoba Wax ◽  
Bunch Rot

Epiphytic growth and survival of Tilletiopsis pallescens, a potential biological control agent of Sphaerotheca fuliginea, on cucumber leawes

1997 ◽  
Vol 75 (6) ◽  
pp. 892-901 ◽  
Author(s):  
E. J. Urquhart ◽  
Z. K. Punja
Keyword(s):  
Biological Control ◽  
Relative Humidity ◽  
Powdery Mildew ◽  
Canola Oil ◽  
Leaf Surface ◽  
Biological Control Agent ◽  
Liquid Paraffin ◽  
Control Agent ◽  
Sphaerotheca Fuliginea ◽  
Growth And Survival

The influence of low (70%) and high (90%) relative humidity on epiphytic growth, development, and survival of Tilletiopsis pallescens, a ballistospore-forming yeast-like fungus, on cucumber leaves was investigated. In addition, survival of the fungus in the presence or absence of powdery mildew (Sphaerotheca fuliginea) colonies was determined. Growth and development were visualized by scanning electron microscopy of the leaf surface, and survival was quantified as colony-forming units recovered on a semiselective medium. Development of T. pallescens from blastospores that were applied to healthy leaves at 70% relative humidity was limited to small colonies that grew adjacent to leaf veins 7 days after application. At 90% relative humidity, extensive hyphal networks had developed within 3 days of blastospore germination, and ballistospores were produced within 7 days. Growth and sporulation of T. pallescens were most extensive at the base and on the surface of leaf trichomas. In the presence of S. fuliginea, T. pallescens mycelium developed adjacent to hyphae and conidiophores of the pathogen within 3 days at both 70 and 90% relative humidity. However, at 90% relative humidity, growth of T. pallescens was more extensive and ballistospores were produced within 5 days, and there was visible collapse of mildew hyphae. There was no evidence of penetration of the leaf or mildew hyphae by T. pallescens. Survival of T. pallescens was significantly (P = 0.05) increased at 1 and 5 days postapplication at 70% relative humidity when blastospores were amended with 1% (v/v) canola oil – lecithin. Survival at 90% relative humidity was also significantly increased with canola oil – lecithin and by the presence of S. fuliginea. The addition of liquid paraffin – lecithin or liquid paraffin – Tween had no effect on survival when compared to the control. The results from this study indicate that growth and survival of T. pallescens are enhanced by high relative humidity and by the presence of powdery mildew, and canola oil – lecithin amendment improved survival on the leaf surface at reduced ambient humidity. Key words: antagonism, biological control, powdery mildew, yeast.

scholarly journals Disease Susceptibility of Interspecific Cold-hardy Grape Cultivars in Northeastern U.S.A.

2021 ◽  
Author(s):  
Ann L Hazelrigg ◽  
Terence L Bradshaw ◽  
Gabriella S. Maia
Keyword(s):  
Powdery Mildew ◽  
Disease Susceptibility ◽  
Production Systems ◽  
Fruit Rot ◽  
Black Rot ◽  
Moderate Disease ◽  
Bunch Rot ◽  
Cold Hardy ◽  
Cultivar Susceptibility ◽  
Grape Cultivars

Susceptibility to economically-important diseases of grapes is critical to the evaluation of germplasm recommended for commercial production and for development of sustainable production systems. In 2018-2019, nine cold-hardy grape cultivars including ‘Brianna’, ‘Crimson Pearl’, ‘Itasca’, ‘Louise Swenson’, ‘Marechal Foch’, ‘Marquette’ ‘Petite Pearl’, ‘St. Pepin’, and ‘Verona’ were evaluated on non-treated vines for susceptibility to downy mildew, powdery mildew, black rot, anthracnose, Phomopsis leaf spot and fruit rot, and Botrytis bunch rot. No cultivars were consistently disease-free, and all exhibited some degree of black rot and powdery mildew infection. Relative susceptibility to disease was not consistent across both years, but ‘Brianna’ had greater incidence of black rot and ‘Louise Swenson’ showed lower incidence of powdery mildew in both years. The relatively new cultivars ‘Crimson Pearl’ and ‘Verona’ exhibited comparatively moderate disease susceptibility overall. Growers typically manage diseases with fungicides on commercial farms, so cultivar susceptibility is just one component of a sustainable pest management and production system.

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 Behavior of Vine Varieties Resistant to Fungal Diseases in the Somontano Region

Agronomy ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 738
Author(s):  
José Casanova-Gascón ◽  
Carla Ferrer-Martín ◽  
Antonio Bernad-Eustaquio ◽  
Andrea Elbaile-Mur ◽  
José M. Ayuso-Rodríguez ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Downy Mildew ◽  
Principal Component ◽  
Climatic Conditions ◽  
Fungal Diseases ◽  
Real Field ◽  
Sauvignon Blanc ◽  
Growing Seasons ◽  
Resistant Varieties ◽  
Bunch Rot

The vine is highly susceptible to numerous fungal diseases, the incidence and severity of which are increasing because of climate change. To fight them, large amounts of phytosanitary products are generally used, although they entail important economic and environmental costs. The new fungus resistant vine varieties (PIWI) constitute one of the most active lines of research on plant material in viticulture and are regarded as a viable solution to respond to the requirements of European Directive 2009/128/EC. In the present work, the evolution and impact of the three main fungal diseases (powdery mildew, downy mildew and botrytis bunch rot) were monitored in plots in the Somontano region (Huesca, Spain), comparing three PIWI varieties (Sauvignon Kretos, Souvignier gris and Muscaris) with a susceptible control variety (Sauvignon blanc) in real field growing conditions over three successive years (2016–2018). The main ampelographic characters of each variety were studied and a weekly follow-up was carried out to track the development of each disease, relating it to climatic variables. Regardless of the climatic conditions (one of the growing seasons was rainy and the other two corresponded to dry years, with differences in the distribution of rainfall), the three PIWI varieties hardly presented any symptoms, demonstrating a high resistance to downy mildew and powdery mildew and even to botrytis. Principal component analysis results pointed to a differential behavior versus the control and treated Sauvignon blanc plants in terms of disease resistance. Based on production results, despite the youth of the plantation, the excellent potential of Sauvignon Kretos variety was observed. However, from the analysis of the quality of wine obtained in microvinifications from these fungus resistant varieties in the second and third year, the one obtained from Muscaris seemed to have the best organoleptic properties. Apart from environmental considerations, given that these fungus resistant varieties can significantly contribute to the sustainability of wineries, they may also respond to the demand of consumers who want zero-pesticide products or of the supporters of ecological products adjusted to European regulations.

scholarly journals Disease Susceptibility of Interspecific Cold-Hardy Grape Cultivars in Northeastern U.S.A

Horticulturae ◽  
2021 ◽  
Vol 7 (8) ◽  
pp. 216
Author(s):  
Ann L. Hazelrigg ◽  
Terence L. Bradshaw ◽  
Gabriella S. Maia
Keyword(s):  
Powdery Mildew ◽  
Disease Susceptibility ◽  
Production Systems ◽  
Fruit Rot ◽  
Black Rot ◽  
Moderate Disease ◽  
Bunch Rot ◽  
Cold Hardy ◽  
Cultivar Susceptibility ◽  
Grape Cultivars

Susceptibility to diseases of economically important grapes is critical to the evaluation of germplasm recommended for commercial production and for the development of sustainable production systems. In 2018–2019, the cold-hardy grape cultivars including ‘Brianna’, ‘Crimson Pearl’, ‘Itasca’, ‘Louise Swenson’, ‘Marechal Foch’, ‘Marquette’ ‘Petite Pearl’, ‘St. Pepin’, and ‘Verona’ were evaluated on non-treated vines for susceptibility to downy mildew, powdery mildew, black rot, anthracnose, Phomopsis leaf spot and fruit rot, and Botrytis bunch rot. No cultivars were consistently disease-free, and all exhibited some degree of black rot and powdery mildew infection. Relative susceptibility to disease was not consistent across both years, but ‘Brianna’ had greater incidence of black rot and ‘Louise Swenson’ showed lower incidence of powdery mildew in both years. The relatively new cultivars ‘Crimson Pearl’ and ‘Verona’ exhibited comparatively moderate disease susceptibility overall. Growers typically manage diseases with fungicides on commercial farms, so cultivar susceptibility is just one component of a sustainable pest management and production system.

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