Managing apple scab (Venturia inaequalis) and powdery mildew (Podosphaera leucotricha) using Adem™

2003 ◽  
Vol 49 (3) ◽  
pp. 243-249 ◽  
Author(s):  
AM Berrie ◽  
X-M Xu
Keyword(s):  
Powdery Mildew ◽  
Venturia Inaequalis ◽  
Apple Scab ◽  
Podosphaera Leucotricha

scholarly journals The efficacy of essential oils against Venturia inaequalis (Cooke) G. Winter and Podosphaera leucotricha (Ellis & Everh.) E. S. Salmon in vivo

2018 ◽  
Vol 10 (1) ◽  
pp. 5-19
Author(s):  
Tamás Hochbaum ◽  
Marietta Petróczy ◽  
Márta Ladányi ◽  
Géza Nagy
Keyword(s):  
Powdery Mildew ◽  
Essential Oils ◽  
Crop Production ◽  
Plant Protection ◽  
Venturia Inaequalis ◽  
Apple Scab ◽  
Volatile Oils ◽  
Podosphaera Leucotricha ◽  
Synthetic Pesticides

Abstract Though profitable crop production can be more simply achieved by using synthetic pesticides, the research of alternative plant protection solutions is necessary. The effect of the volatile oils of cinnamon, thyme, and a copper ingredient fertilizer were tested for their activity against apple scab and powdery mildew in apple orchards in 2014 and 2017. Oils applied alone or in combination were effective against apple scab in 2014 and in 2017 and against powdery mildew on leaves in 2017. The copper ingredient fertilizer product improved the efficacy of the oils. The results of these trials show that the tested volatile oils are suitable candidates for further research and for the development of organic fungicides against the diseases of apple.

Susceptibility of apple cultivars to apple scab and powdery mildew in Victoria, Australia

1998 ◽  
Vol 38 (6) ◽  
pp. 625 ◽  
Author(s):  
W. S. Washington ◽  
O. N. Villalta ◽  
J. Ingram ◽  
D. Bardon
Keyword(s):  
Powdery Mildew ◽  
Venturia Inaequalis ◽  
Natural Infection ◽  
Apple Scab ◽  
Podosphaera Leucotricha ◽  
Commercial Cultivars ◽  
Apple Cultivars ◽  
High Level

Summary. Twenty apple cultivars were assessed over 3 seasons for their susceptibility to natural infection with scab (caused by Venturia inaequalis) and powdery mildew (caused by Podosphaera leucotricha). It was evident that a number of important commercial cultivars are highly susceptible to leaf scab (average incidence of leaf scab: Pink Lady, 40.2% of leaves; Lady William, 37.1%; Braeburn, 20.0%; and New Jonagold, 18.7%) and powdery mildew (average incidence of leaf mildew: New Jonagold, 23.0%; Pink Lady, 17.8%). There was a high level of resistance to leaf scab in the cultivars Florina-Quérina, Redfree and Jonafree (all less than 1% incidence on leaves) and to powdery mildew in the cultivar Earlidel (no infection observed). The cultivars Jonathan, Bonza and Red Elstar showed a useful level of resistance to scab (average incidence of leaf scab between 1.6 and 3.2%), while the cultivars Red Fuji, HiEarly and Redfree all showed some resistance to powdery mildew (average incidence of mildew between 2.6 and 5.9%). Observations made on the low and variable numbers of fruit produced by some trees in their third year after planting showed that Pink Lady and Lady William were highly susceptible to fruit scab (67.6 or 57.6% scabbed fruit respectively). Twig infection by scab was also observed on shoots of the current season’s growth of Pink Lady.

scholarly journals Apple cultivars resistant to scab (Venturia inaequalis (Cke) Aderh.) Part I. Pomological evaluation of apple cultivars

2013 ◽  
Vol 42 (1-2) ◽  
pp. 105-122
Author(s):  
Zbigniew Borecki ◽  
Aleksander Rejman ◽  
Ryszard Nowakowski ◽  
Beata Słowińska
Keyword(s):  
Powdery Mildew ◽  
Biochemical Analysis ◽  
Venturia Inaequalis ◽  
Apple Scab ◽  
High Susceptibility ◽  
High Productivity ◽  
Flowering Season ◽  
Lower Productivity ◽  
Apple Cultivars

Sixteen apple cultivars and numbered selections resistant to apple scab were investigated in the years 1982-1986. The investigations concerned the following questions: vigour of growth, flowering, season of ripening, evaluation of fruits and their biochemical analysis. Three groups of apple cultivars were distinguished. The first group included 'Freedom', 'Liberty' and 'Novamac' which showed high productivity, satisfactory winterhardiness and best taste of fruits. Four cultivars: 'Primula', 'Prima', 'Priam' and 'Liberty Sister', were recognized as interesting because. of their ripening season and original taste but their winterhardiness was insufficient. Seven cultivars: 'Florina', 'Sir Prize', 'Priscilla', 'Macfree', 'Nova Easygro', 'Gavin' and 'Jonafree', as well as two numbered selections, NY 55-158-2 and NY 61-345-2, were disqualified because of lower productivity, high susceptibility to apple powdery mildew, poor taste, low acidity of fruits and low winterhardiness.

Efficacy of Kaolin-Based Particle Films to Control Apple Diseases

2001 ◽  
Vol 2 (1) ◽  
pp. 4 ◽  
Author(s):  
D. Michael Glenn ◽  
Tom van der Zwet ◽  
Gary Puterka ◽  
Patricia Gundrum ◽  
Eric Brown
Keyword(s):  
Fire Blight ◽  
Erwinia Amylovora ◽  
Venturia Inaequalis ◽  
Apple Scab ◽  
Field Studies ◽  
Podosphaera Leucotricha ◽  
Malus Domestica Borkh ◽  
Sooty Blotch ◽  
Leaf Infection ◽  
Hydrophilic Particles

Studies were conducted from 1997 to 1999 to evaluate the effect of processed kaolin-based particle film applications on the incidence and severity of apple (Malus domestica Borkh.) diseases. Greenhouse and field studies demonstrated that pre-emptive application of hydrophobic and hydrophilic particles reduced the incidence of fire blight (Erwinia amylovora (Burrill) Winslow et al.) in blossoms and injured shoots. Hydrophobic and hydrophilic particles suppressed sooty blotch (Gloeodes pomigena (Schwein.)) and flyspeck (Schizothyrium pomi (Mont. & Fr.) Arx: anamorph Zygophiala jamaicensis Mason) to levels equivalent to conventional fungicides. In field studies, apple scab (Venturia inaequalis (Cooke) Wint.: anamorph Spilocaea pomi Fr.) was not suppressed by hydrophilic particles. Hydrophilic particles did not interfere with the action of conventional fungicides or the activity of calcium hydroxide to suppress apple scab. Hydrophilic particles did reduce powdery mildew (Podosphaera leucotricha (Ell. & Ev.) E.S. Salmon (anamorph Oidium farinosum Cooke)) russetting on fruit, but leaf infection was extensive. Accepted for publication 27 July 2001. Published 23 August 2001.

scholarly journals Effect of pruning on disease incidence of apple scab and powdery mildew in integrated and organic apple production

2005 ◽  
Vol 11 (1) ◽  
Author(s):  
I. J. Holb
Keyword(s):  
Powdery Mildew ◽  
Production System ◽  
Production Systems ◽  
Venturia Inaequalis ◽  
Disease Incidence ◽  
Apple Scab ◽  
Organic Production ◽  
Environmentally Benign ◽  
Apple Cultivars ◽  
Apple Production

In a three-year study, the effect of two winter pruning treatments (strong and weak) on apple scab (Venturia inaequalis) and powdery mildew (Podosphaera leucotricha) was evaluated on six apple cultivars (`Rewena', `Elstar', 'Liberty', 'Gala', 'Pilot' and `Jonica') in two environmentally-benign apple production systems (integrated and organic). Results on apple scab showed that compared to the integrated production system, the pathogen caused significantly more infection on the leaves of cvs. `Elstar', 'Gala' and `Jonica' in the organic production system. The effect of pruning treatments on apple scab was mainly detectable on the cultivars susceptible to the disease such as cvs. 'Gala' and `Jonica'. The weak pruning correlated with a higher level of apple scab infection than the strong pruning, especially in the organic production system. Primary mildew infection was very low in both protection systems (below 2 %), therefore, effect of pruning on primary mildew infection could not be analysed. Low secondary mildew incidence was detected in the organically treated orchard part; however, incidence of powdery mildew was significantly higher (P> 0.05) on cvs. 'Elstar', 'Pilot' and `Jonica' in the integrated orchard part compared to cvs. 'Gala', 'Rewena' and 'Liberty'. The highest incidence of mildew was on cv. 'Elstar'. Pruning had very low effect on incidence of secondary mildew infection on leaves.

scholarly journals Identification of apple scab and powdery mildew resistance genes in Czech apple (Malus × domestica) genetic resources by PCR molecular markers

2011 ◽  
Vol 47 (No. 4) ◽  
pp. 156-165 ◽  
Author(s):  
J. Patzak ◽  
F. Paprštein ◽  
A. Henychová
Keyword(s):  
Molecular Markers ◽  
Powdery Mildew ◽  
Genetic Resources ◽  
Resistance Genes ◽  
Powdery Mildew Resistance ◽  
Venturia Inaequalis ◽  
Apple Scab ◽  
Scab Resistance ◽  
Mildew Resistance ◽  
Apple Cultivars

The presence of genes for resistance to scab (Venturia inaequalis) and powdery mildew (Podosphaera leucotricha) was studied using molecular markers in a sample of 279 apple cultivars from the Czech collection of apple genetic resources. The sample comprised 37 cultivars supposed to have the Vf gene for scab resistance, 97 reference world cultivars and 145 old and local cultivars. Six PCR molecular markers for the scab resistance genes Vf, Vm, Vbj, Vr and Vh and three PCR molecular markers for the powdery mildew resistance genes Pl-w, Pl-1 and Pl-d were used. The marker for the major scab resistance gene Vf was detected in all cultivars supposed to have Vf, except in Romus 1, and in the three small-fruited cultivars Malus Evereste, Golden Gem and Hilleri. The markers of the Vr and Vh scab resistance genes were detected in 22 cultivars in combination with the marker for Vf, in 56 reference world cultivars and in 82 old and local apple cultivars. PCR molecular markers for one or two of the powdery mildew resistance genes were detected in the small-fruited cultivars Malus Evereste, Golden Gem, prof. Sprengeri and Hilleri; and in the larger fruited cultivars Hagloe Crab, Borovinka and Tita Zetei. We did not find markers for the scab resistance genes Vm and Vbj in any of the studied cultivars. They are absent also in the remaining part of the Czech collection of apple genetic resources. PCR molecular markers are useful tools for the identification of resistance genes within apple germplasm collections and can be used to increase the number of sources for disease resistance in breeding programmes.

Apple Disease Control and Bloom-Thinning Effects by Lime Sulfur, Regalia, and JMS Stylet-Oil

2018 ◽  
Vol 19 (2) ◽  
pp. 143-152
Author(s):  
Candace N. DeLong ◽  
Keith S. Yoder ◽  
Allen E. Cochran ◽  
Scott W. Kilmer ◽  
William S. Royston ◽  
...  
Keyword(s):  
Disease Control ◽  
Management Practices ◽  
Venturia Inaequalis ◽  
Apple Scab ◽  
Load Management ◽  
Load Reduction ◽  
Podosphaera Leucotricha ◽  
High Quality ◽  
Crop Load ◽  
Chemical Spray

Apple (Malus × domestica Borkh.) growers require management practices that will produce high-quality fruit while minimizing the number of chemicals used for adequate disease control and horticultural practices. Certain chemicals applied for bloom thinning also have fungicidal properties and could provide protection against early season diseases in addition to crop reduction. Over 5 years, treatments of lime sulfur (LS), Regalia (an organically approved biofungicide), and JMS Stylet-Oil (JSO) were evaluated for protection against apple scab (Venturia inaequalis [Cooke.] G. Wint.), powdery mildew (Podosphaera leucotricha [Ellis & Everh.] E. S. Salmon), cedar apple rust (Gymnosporangium juniperi-virginianae Schwein.), and quince rust (Gymnosporangium clavipes [Cooke & Peck] Cooke & Peck in Peck), as well as crop load reduction and fruit finish. Both LS and Regalia reduced apple scab and cedar apple rust in four out of five test years. Treatments of Regalia applied with JSO provided disease protection and crop load reduction similar to LS applied with JSO. We provide evidence that LS and Regalia, applied as bloom thinners, can reduce chemical applications used during bloom by combining two chemical spray functions: one for disease protection and one for crop load management.

Constituents from Morus root bark against Venturia inaequalis – the causal agent of apple scab

Planta Medica ◽  
2007 ◽  
Vol 73 (09) ◽  
Author(s):  
JM Rollinger ◽  
R Spitaler ◽  
M Menz ◽  
P Schneider ◽  
EP Ellmerer ◽  
...  
Keyword(s):  
Venturia Inaequalis ◽  
Apple Scab ◽  
Causal Agent ◽  
Root Bark
Sign in / Sign up

Export Citation Format

Share Document