Management of Botrytis Leaf Blight of Onion: The Québec Experience of 20 Years of Continual Improvement

Carisse, Odile; Tremblay, D. M.; McDonald, Mary Ruth; Brodeur, Luc; McRoberts, Neil

doi:10.1094/pdis-11-10-0797

Cited by 26 publications

(33 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other studies have noted that the amount and titning of primary inoculum appearance exert a great influence on powdery mildew and downy mildew outbreaks on hop (9,15,17,27), as well as polycyclic diseases in other systems (1,14). Epidemiological theory predicts that management of polycyclic diseases can be achieved by reducing initial disease intensity or the rate of disease increase (37).…”

Section: Discussionmentioning

confidence: 99%

Association of Spring Pruning Practices with Severity of Powdery Mildew and Downy Mildew on Hop

et al. 2012

View full text Add to dashboard Cite

spring pruning practices with severity of powdery mildew and downy mildew on hop. Plant Dis. 96:1343-1351.Downy mildew (caused by Pseudoperonospora liumuli) and powdery mildew (caused by Podosphaera macularis) are important diseases of hop in the Pacific Northwest United States, and cultural practices may affect the severity of both diseases. The association of spring pruning quality and timing with severity of downy mildew and powdery mildew was assessed through analysis of survey data collected from commercial hop yards in Oregon and Washington. Among 149 hop yards surveyed, the most common pruning method was chemical desiccation (48% of yards), mechanical pruning (23%), or a combination of these practices (15%). The quality of pruning was assessed using a threecategory ordinal scale ("excellent", "moderate", or "poor") based on the amount of foliage remaining on plants following pruning. Excellent pruning quality was attained more often in yards pruned twice (74.6 to 82.1 % of yards) versus once (33.8% of yards), independent of pruning method. Seasonal severity of downy mildew in Oregon increased approximately twofold with reduction in pruning quality from excellent to moderate to poor. Pruning quality was not significantly related to levels of powdery mildew on leaves or cones in Oregon. Under more severe disease pressure in Washington, however, seasonal severity of powdery mildew on leaves and the incidence of cones with powdery mildew were significantly greater in yards that had poor pruning compared with excellent pruning. Moreover, yards that had excellent pruning quality received, on average, 1.1 to 1.5 fewer fungicide applications per season for downy mildew or powdery mildew compared with yards that had moderate or poor pruning quahty. This savings was associated with delayed initiation of the first application by 7.5 to 14.2 days in yards with excellent pruning quality. Replicated experiments in commercial yards in Oregon quantified the effect of delaying pruning timing 5 to 21 days compared with growers' standard practices on the diseases and yield. Downy mildew suppression by delayed pruning was dependent on cultivar and year of sampling, being significantly reduced fivefold only in 'Willamette' in 2007. Severity of powdery mildew and cone yield was similar between plots that received the delayed or standard pruning timing treatments. Collectively, these studies emphasize that early spring sanitation measures are associated with reduced primary inoculum and are critically important for managing both downy mildew and powdery mildew. A savings of at least one fungicide application per year appears achievable when spring pruning is conducted thoroughly and slightly delayed compared with growers' current practices.Cultural disease management practices are actions that involve the manipulation of the plant, its components, crop refuse, and the environment to reduce or prevent disease (5,26,31,34). In hop (Humulus lupulus L.), cultural practices are an important component of integrated management of the t...

show abstract

Section: Discussionmentioning

confidence: 99%

Association of Spring Pruning Practices with Severity of Powdery Mildew and Downy Mildew on Hop

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Moreover, the use of Bacillus subtilis and Microsphaeropsis ochracea represents an alternative or additional biological strategy (Carisse et al 2015).…”

Section: Farming Practicesmentioning

confidence: 99%

Interactions among genotype, environment and agronomic practices on production and quality of storage onion (Allium cepa L.) - A review

Sękara¹,

Pokluda²,

Vacchio³

et al. 2017

Hortic. Sci.

View full text Add to dashboard Cite

Sekara A., Pokluda R., Del Vacchio L., Somma S., Caruso G. (2017) The aim of this review is a wide description of the relationships between growing conditions and bulb yield and quality of onion (Allium cepa L.), focused particularly on long-day cultivars suitable for storage. Marketable yield decreases according to the reduction of crop length caused by the increase of growth temperature. The nutritive requirements of storage onion are highest during the vegetative growth. The application of humic substances and the inoculation of mycorrhizae may enhance bulb growth and quality, mainly under stress conditions. Onion is a slow-growth, shallowrooted crop with non-shading habitus and therefore its productivity is highly dependent on water availability in the soil, proper fertilization and weed control. The shelf-life of onion bulbs is a genetic trait, improvable by efficient crop and post-harvest management, and adequate conditions of bulb storage. The quality of storage onion bulbs is ascribed to several indicators, such as thiosulfonates, pyruvic acid, soluble solids, sugars, and many other biological compounds. This review is also focused on onion quality as affected by the interactions among genotype, environment, farming practices and post-harvest management.

show abstract

“…Allium crops, such as onion [15][16][17][18][19][20] , garlic and chives 21) . There are many reports about this pathogen infecting garlic sprouts in storage periods 1,2,5) , but fewer about the disease symptoms and damage in markets.…”

Section: Botrytis This Pathogen Can Directly Induce Diseases Ofmentioning

confidence: 99%

Botrytis squamosa: The Pathogen of Market Disease of Garlic Sprouts

Liu

Zhu

Wang

et al. 2013

Kansai Byochugai Kenkyukaiho

View full text Add to dashboard Cite

SummaryGarlic sprouts in Shanghai markets frequently suffer from bract rot attached with white molds and brown rot in stem.Isolation and pathogenic identification of the pathogen were conducted according to the Koch's Rule, and the major pathogen named EXGL-19 was identified as Botrytis squamosa J.C. Walker via morphological characters and the internal transcribed spacer (ITS) sequence of the ribosomal DNA. The young aerial mycelium of EXGL-19 was white, and then turned to grey after maturation. This fungus could grow on potato dextrose agar (PDA) at the temperatures that ranged from 0-30°C, with the optimum at 15-20°C. Microconidia could form after 16 days of culture at 20°C, while macroconidia only formed after 60 days of culture at 0°C. The pathogen can significantly promote the ethylene release of the garlic sprouts, which accelerated aging of garlic tissue.In summary, these findings provided basic clues for controlling the market disease of garlic sprouts and reducing the losses.

show abstract

Management of Botrytis Leaf Blight of Onion: The Québec Experience of 20 Years of Continual Improvement

Cited by 26 publications

References 24 publications

Association of Spring Pruning Practices with Severity of Powdery Mildew and Downy Mildew on Hop

Association of Spring Pruning Practices with Severity of Powdery Mildew and Downy Mildew on Hop

Interactions among genotype, environment and agronomic practices on production and quality of storage onion (Allium cepa L.) - A review

Botrytis squamosa: The Pathogen of Market Disease of Garlic Sprouts

Contact Info

Product

Resources

About