Causal agent of bacterial rot of onion (Allium cepa) bulbs in the Tohoku region of Japan

2019 ◽  
Vol 85 (3) ◽  
pp. 205-210 ◽  
Author(s):  
M. TSUJI ◽  
A. NAGASAKA ◽  
I. KADOTA
Keyword(s):  
Allium Cepa ◽  
Causal Agent ◽  
Bacterial Rot

scholarly journals Yield, Quality, and Storage Characteristics of Onion Cultivars in the Columbia Basin of Washington in 2012–14

2016 ◽  
Vol 26 (2) ◽  
pp. 230-243 ◽  
Author(s):  
Carrie H. Wohleb ◽  
Timothy D. Waters
Keyword(s):  
Allium Cepa ◽  
Good Choice ◽  
Cultivar Differences ◽  
Columbia Basin ◽  
Size Category ◽  
High Incidence ◽  
Yield Quality ◽  
Bacterial Rot ◽  
And Storage ◽  
Storage Characteristics

An onion (Allium cepa) cultivar trial is conducted in the Columbia Basin of Washington every year. The trial helps onion growers, packers, processors, and seed companies compare cultivars and identify those most suited to their operations. This report evaluates 54 onion cultivars that were in the trials 2 years or more from 2012 to 2014. Marketable yields of cultivars averaged 764 to 1314 cwt/acre. ‘TTA-747’, ‘Scout’, ‘SV6672NW’, ‘Montero’, ‘XP07716000’, and ‘SV4058NV’ had the highest yields. All cultivars produced more jumbo-sized (3 to 4 inches) bulbs compared with any other size category, but those with the largest percentages of jumbo bulbs were Utrero, Gunnison, and Sedona. ‘Scorpion’, ‘Ruby Ring’, and ‘Purple Haze’ had the largest percentages of medium (2.25 to 3 inches) bulbs, and ‘Montero’ and ‘Ovation’ had the largest combined percentages of jumbo and colossal (>4 inches) bulbs. Cultivar differences were evident in the 2012 and 2014 trials when many of the onions flowered (bolted). Cultivars averaged 0.0 to 15.5 bolted onions per plot when 2012 and 2014 results were combined. ‘Trekker’, ‘Highlander’, ‘Trailblazer’, ‘Ruby Ring’, ‘NUN8003ON’, and ‘Milestone’ had the fewest bolted onions. Cultivar differences were also apparent when several aspects of bulb quality were evaluated after 4 months in storage. ‘Utrero’, ‘Trekker’, ‘NUN7202ON’, and ‘Tamara’ had the most uniformly shaped bulbs. Bulbs of ‘Crockett’, ‘Legend’, and ‘Utrero’ had the most complete skins. ‘Crockett’, ‘Talon’, ‘Utrero’, ‘Legend’, ‘Gunnison’, and ‘Tamara’ had the firmest bulbs. Only 14 of 54 cultivars averaged more than 74% functionally single-centered bulbs. ‘NUN7202ON’, ‘Arcero’, ‘Joaquin’, and ‘Utrero’ had the largest percentages of bulbs with single centers or small multiple centers. There were more rots caused by bacteria (Enterobacter sp.) in bulbs produced in the 2014 trial than in 2012 and 2013, probably due to a high incidence of internal dry scale in 2014. Incidence of bacterial rot in cultivars was not significantly different in 2014, but there were some cultivar differences in 2012 and 2013. Incidence of fungal neck rot (caused by Botrytis sp.) in these trials was low and there were no significant cultivar differences. The results of these trials demonstrate that many new and advanced experimental cultivars have attributes that could make them a good choice for onion growers in the Columbia Basin.

SCREENING WORLD ONION GERMPLASM COLLECTION AND COMMERCIAL CULTIVARS FOR RESISTANCE TO SMUT

1980 ◽  
Vol 60 (1) ◽  
pp. 157-161 ◽  
Author(s):  
R. S. UTKHEDE ◽  
J. E. RAHE
Keyword(s):  
British Columbia ◽  
Allium Cepa ◽  
Germplasm Collection ◽  
Plant Introduction ◽  
Causal Agent ◽  
Commercial Cultivar ◽  
Commercial Cultivars ◽  
Muck Soil ◽  
Onion Germplasm

Two hundred and fifty-five accessions to the USDA world onion germplasm collection and 66 commercial cultivars of Allium cepa were screened for resistance to Urocystis magica, the causal agent of onion smut. The trial was conducted in Cloverdale, British Columbia on a muck soil heavily infested with U. magica. Percent smut infection in bulbs at harvest was measured and significant differences (P = 0.01) among the accessions and cultivars occurred. Three plant introduction lines and one commercial cultivar were completely resistant to U. magica in the trial and significant levels of resistance were found in six other plant introduction lines and one commercial cultivar.

First Report of Powdery Mildew of Onion (Allium cepa) Caused by Leveillula taurica in the Pacific Northwest

2004 ◽  
Vol 5 (1) ◽  
pp. 17 ◽  
Author(s):  
Lindsey J. du Toit ◽  
Dean A. Glawe ◽  
Gary Q. Pelter
Keyword(s):  
Powdery Mildew ◽  
Pacific Northwest ◽  
Allium Cepa ◽  
Washington State ◽  
Causal Agent ◽  
Columbia Basin ◽  
First Report ◽  
Leveillula Taurica ◽  
The Pacific ◽  
Published Report

A powdery mildew disease of onion has been observed infrequently in the Columbia Basin of Washington State since 1996, but this is the first published report of this disease in the Pacific Northwest. The causal agent was determined to be Leveillula taurica (Lév.) G. Arnaud. Accepted for publication 29 October 2004. Published 29 November 2004.

SCREENING WORLD ONION GERMPLASM COLLECTION FOR RESISTANCE TO WHITE ROT

1978 ◽  
Vol 58 (3) ◽  
pp. 819-822 ◽  
Author(s):  
R. S. UTKHEDE ◽  
J. E. RAHE
Keyword(s):  
British Columbia ◽  
Allium Cepa ◽  
Germplasm Collection ◽  
Causal Agent ◽  
White Rot ◽  
Sclerotium Cepivorum ◽  
Muck Soil ◽  
Onion Germplasm

Two hundred and ninety-four accessions to the USDA world germplasm collection of Allium cepa were screened for resistance to Sclerotium cepivorum, the causal agent of white rot. The trial was conducted on organic muck soil in Burnaby, British Columbia, with uniformly high levels of added inoculum. Percent white rot infection in bulbs at harvest was measured and significant differences (P = 0.05) among the accessions occurred. High levels of resistance were found in at least three of the accessions, but none was immune.

scholarly journals Exploitation of Biostimulants as an Alternative Strategy to Control Bacterial Rot Diseases of Onion (Allium cepa L.)

2015 ◽  
Vol 43 (1) ◽  
pp. 65-77
Author(s):  
Ahmed Gomah ◽  
Mohamed Abdallah ◽  
Samia Haroun ◽  
Saad Farouk ◽  
Huda Badr
Keyword(s):  
Allium Cepa ◽  
Alternative Strategy ◽  
Allium Cepa L ◽  
Bacterial Rot

Pseudomonas grimontii, causal agent of turnip bacterial rot disease in Japan

2019 ◽  
Vol 85 (6) ◽  
pp. 413-423 ◽  
Author(s):  
Hiroyuki Sawada ◽  
Harukuni Horita ◽  
Tomoo Misawa ◽  
Yuichi Takikawa
Keyword(s):  
Causal Agent ◽  
Bacterial Rot ◽  
Rot Disease
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