Early Identification Of Onion Diseases

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Early Identification Of Onion Diseases

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Author : Leona B. Ransom
language : en
Publisher:
Release Date : 1996

Early Identification Of Onion Diseases written by Leona B. Ransom and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Onions categories.

Early Identification Of Onion Diseases Final Report February 1995

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Author :
language : en
Publisher:
Release Date : 1995

Early Identification Of Onion Diseases Final Report February 1995 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.

Onion Diseases In Victoria

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Author : D. E. Harrison
language : en
Publisher:
Release Date : 1960*

Onion Diseases In Victoria written by D. E. Harrison and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1960* with Onions categories.

Manual For Identifying Onion Diseases

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Author : Canada. Agriculture Canada
language : en
Publisher:
Release Date : 1983

Manual For Identifying Onion Diseases written by Canada. Agriculture Canada and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with categories.

Identification Of Diseases And Disorders Of Onions

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Author : Jim Raymond Chaput
language : en
Publisher:
Release Date : 1995

Identification Of Diseases And Disorders Of Onions written by Jim Raymond Chaput and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Onions categories.

A Manual For Identifying Onion Diseases

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Author : Rene Crete
language : en
Publisher:
Release Date : 1983

A Manual For Identifying Onion Diseases written by Rene Crete and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Onions categories.

Manual For Identifying Onion Diseases

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Author : Canada. Department of Agriculture
language : en
Publisher:
Release Date : 1983

Manual For Identifying Onion Diseases written by Canada. Department of Agriculture and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with categories.

Diagnosis And Control Of Onion Diseases

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Author :
language : en
Publisher:
Release Date : 2001

Diagnosis And Control Of Onion Diseases written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.

Identification Of Diseases And Disorders Of Onions Rev

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Author :
language : en
Publisher:
Release Date : 2000

Identification Of Diseases And Disorders Of Onions Rev written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.

Provides information on various diseases & disorders that affect onions & related crops in Ontario. Includes descriptions of the disease or disorder and guidance on monitoring & management methods for seed & seedling diseases & disorders, foliage diseases, root & bulb diseases, and disorders such as ozone & weather-related injuries.

Prevention And Detection Of Sour Skin Of Onion Allium Cepa By Crop Rotation Micronutrient Manipulation And Volatile Compound Detection

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Author : Anna Katherine Watson
language : en
Publisher:
Release Date : 2016

Prevention And Detection Of Sour Skin Of Onion Allium Cepa By Crop Rotation Micronutrient Manipulation And Volatile Compound Detection written by Anna Katherine Watson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.

Sour skin of onion (Allium cepa L.), caused by the soil-borne bacterium Burkholderia cepacia, (ex Burkholder 1950) Yabuuchi et al. 1993, is a devastating disease of onion and is responsible for post-harvest losses annually. Current management strategies are to avoid contaminated fields and adjust planting dates to avoid high temperatures during harvest. In addition, harvesting onions at optimum maturity, field-curing a minimum of 48 h, sorting and grading to remove infected onions and storing onions under proper conditions are also used to manage sour skin. However, these strategies have not adequately reduced losses when conditions are favorable for disease. Other strategies, such as chemical control and resistance, are not viable options for controlling sour skin. Furthermore, infected onions may go undetected during the sorting and grading process. Such bulbs have the potential of infecting healthy onions in storage. Innovative and integrated management practices aimed at preventing disease in the field and improving early detection are needed to effectively manage sour skin of onion. This research evaluated management practices focused on prevention of sour skin in the field by rotating or double-cropping with crops that had a negative impact on B. cepacia populations in vitro. Under controlled conditions in the laboratory, populations of B. cepacia declined in the soil as a result of direct contact with root exudates of pearl millet (Pennisetum glaucum (L.) R. Brown). Initially, double-cropping onion with pearl millet reduced sour skin incidence and severity in field trials. However, by the fourth year of continuous double-cropping of onion with pearl millet, the beneficial effects of reducing sour skin were virtually non-existent. Since the crops used in the rotation and double-cropping treatments deplete different soil nutrients, the role that mineral nutrition plays on plant disease development also was investigated. In 2012 and 2014, field-grown onion bulbs and soils were evaluated for mineral composition. Data were analyzed with stepwise and maximum R2 improvement regression using sour skin (incidence or severity) as the dependent variable. In 2012, a tissue model (P=0.0002; adj. R2=0.51) was developed that included ratios of copper: iron, zinc: iron and sulfur: aluminum as well as manganese and nitrogen as independent variables. Likewise, a soil model (P = 0.00006 adj. R2 = 0.57) that included the ratios of zinc: iron, iron: manganese and manganese: zinc as well as copper and potassium as independent variables were also developed to predict sour skin severity. Due to a total crop loss in 2013, onions purchased from grocery stores were inoculated, incubated, graded for disease severity, and used for mineral analysis. The grocery store model (P=0.00001; adj. R2=0.43) also contained a ratio of copper: iron, and the minerals aluminum, potassium, nitrogen, and sulfur as independent variables, all of which were components of the models developed in 2012. In 2014, a tissue model (P=0.00002; adj. R2=0.34) based on natural infections in the field contained the ratios of copper: iron, sodium: iron, manganese: zinc, and the elements calcium, manganese, and nitrogen as the independent variables. The elements copper, iron, manganese, and zinc consistently occurred in nine different sour skin models developed over a 3 year period. These elements are cofactors of three superoxide dismutases (SODs) in plants that play a key role in reactive oxygen species (ROS) detoxification and systemic acquired resistance (SAR). Preliminary results suggest that the effects these elements have on sour skin is by ultimately affecting SODs and the SAR pathway. In addition to field studies, investigations on early disease detection were conducted to improve current sorting and grading processes. Improvements are needed for the onion industry to eliminate onions with internal infections from going in to storage or entering the marketplace. Targeting the detection of volatile organic compounds (VOCs) using zNose technology was evaluated. When numbers of infected onions ranged from 10-50% and the volume of the container was