scholarly journals Application of Candida saitoana and Glycolchitosan for the Control of Postharvest Diseases of Apple and Citrus Fruit Under Semi-Commercial Conditions

Plant Disease ◽  
2000 ◽  
Vol 84 (3) ◽  
pp. 243-248 ◽  
Author(s):  
Ahmed El-Ghaouth ◽  
Joseph L. Smilanick ◽  
G. Eldon Brown ◽  
Antonio Ippolito ◽  
Michael Wisniewski ◽  
...  
Keyword(s):  
Control Level ◽  
Citrus Fruit ◽  
Apple Cultivar ◽  
Postharvest Diseases ◽  
Early Season ◽  
Bioactive Coating ◽  
Washington Navel ◽  
Golden Delicious

The efficacy of the combination of Candida saitoana with 0.2% glycolchitosan (the bioactive coating) as a biocontrol treatment of postharvest diseases of apple and citrus fruit was evaluated in tests with natural inoculations that simulated commercial packinghouse conditions. The growth of C. saitoana in apple wounds and on fruit surfaces was not affected by glycolchitosan. The bioactive coating was more effective in controlling decay of several cultivars of apples (Red Delicious, Rome, Golden Delicious, and Empire) than either C. saitoana or 0.2% glycolchitosan alone. Depending on the apple cultivar used, the bioactive coating was comparable or superior to thiabendazole in reducing decay. The bioactive coating was also superior to C. saitoana in controlling decay of oranges (cvs. Washington navel, Valencia, Pineapple, and Hamlin) and cv. Eureka lemons, and the control level was equivalent to that with imazalil. The bioactive coating and imazalil treatments offered consistent control of decay on Washington navel oranges and Eureka lemons in early and late seasons, while C. saitoana or 0.2% glycolchitosan were most effective on early-season fruit. The combination of C. saitoana with 0.2% glycolchitosan also reduced the incidence of stem-end rot of cv. Valencia oranges, but control was less effective than treatment with imazalil.

scholarly journals Identification of Lasiodiplodia pseudotheobromae Causing Fruit Rot of Citrus in China

Plants ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 202
Author(s):  
Jianghua Chen ◽  
Zihang Zhu ◽  
Yanping Fu ◽  
Jiasen Cheng ◽  
Jiatao Xie ◽  
...  
Keyword(s):  
Phylogenetic Analyses ◽  
Elongation Factor ◽  
Morphological Characteristics ◽  
Citrus Fruit ◽  
Economic Loss ◽  
Fruit Rot ◽  
Post Inoculation ◽  
Citrus Reticulata ◽  
Postharvest Diseases ◽  
Citrus Reticulata Blanco

Considering the huge economic loss caused by postharvest diseases, the identification and prevention of citrus postharvest diseases is vital to the citrus industry. In 2018, 16 decayed citrus fruit from four citrus varieties—Satsuma mandarin (Citrus unshiu), Ponkan (Citrus reticulata Blanco cv. Ponkan), Nanfeng mandarin (Citrus reticulata cv. nanfengmiju), and Sugar orange (Citrus reticulata Blanco)—showing soft rot and sogginess on their surfaces and covered with white mycelia were collected from storage rooms in seven provinces. The pathogens were isolated and the pathogenicity of the isolates was tested. The fungal strains were identified as Lasiodiplodia pseudotheobromae based on their morphological characteristics and phylogenetic analyses using the internal transcribed spacer regions (ITS), translation elongation factor 1-α gene (TEF), and beta-tubulin (TUB) gene sequences. The strains could infect wounded citrus fruit and cause decay within two days post inoculation, but could not infect unwounded fruit. To our knowledge, this is the first report of citrus fruit decay caused by L. pseudotheobromae in China.

Control of postharvest diseases on citrus fruit by preharvest application of the biocontrol agent Pantoea agglomerans CPA-2

2008 ◽  
Vol 49 (1) ◽  
pp. 86-95 ◽  
Author(s):  
Teresa Paula Cañamás ◽  
Immaculada Viñas ◽  
Josep Usall ◽  
Carla Casals ◽  
Cristina Solsona ◽  
...  
Keyword(s):  
Biocontrol Agent ◽  
Citrus Fruit ◽  
Pantoea Agglomerans ◽  
Postharvest Diseases

The interactive effects of early season temperatures, crop density and rootstock on average fruit weight of ‘Golden Delicious’ apple

2017 ◽  
pp. 189-194
Author(s):  
R.P. Marini ◽  
R.M. Crassweller ◽  
W. Autio ◽  
R. Moran ◽  
T.L. Robinson ◽  
...  
Keyword(s):  
Fruit Weight ◽  
Interactive Effects ◽  
Early Season ◽  
Crop Density ◽  
Golden Delicious

scholarly journals A Postharvest Fruit Rot in Apple Caused by Phacidiopycnis washingtonensis

Plant Disease ◽  
2006 ◽  
Vol 90 (11) ◽  
pp. 1376-1381 ◽  
Author(s):  
Y. K. Kim ◽  
C. L. Xiao
Keyword(s):  
New Species ◽  
Washington State ◽  
Fruit Rot ◽  
Postharvest Diseases ◽  
Disease Symptoms ◽  
Fruit Skin ◽  
Golden Delicious ◽  
Phacidiopycnis Washingtonensis ◽  
A New Species ◽  
Decay Development

During a survey of postharvest diseases in Red Delicious apples (Malus domestica) conducted in 2003, a previously undescribed postharvest fruit rot was discovered in Washington State. The causal agent has been described as a new species, Phacidiopycnis washingtonensis. In this study, we described the symptomatology of this disease, determined its occurrence and prevalence in Washington State, tested pathogenicity, and determined infection courts on fruit of three apple varieties. Decayed fruit were sampled from 26, 72, and 81 grower lots during March to August in 2003, 2004, and 2005, respectively, during packing operations from commercial packinghouses. Symptoms of decayed fruit were recorded and isolations were made from decayed fruit to correlate causal agents with the disease symptoms observed. Fruit of Red Delicious, Golden Delicious, and Fuji apples were inoculated in the orchards with conidial suspensions of the fungus at 1 and 2 weeks before harvest. All fruit were harvested and stored at 0°C, and decay development on the fruit was monitored monthly for up to 9 months. The symptoms were primarily stem-end rot and calyx-end rot. Infection also occurred at lenticels on fruit skin, particularly on Golden Delicious. The decayed area was spongy to firm and appeared light brown to brown. On Red Delicious, brown to black specks at lenticels often appeared at the decayed area as the disease advanced. This disease occurred in 23, 26, and 17% of the total grower lots, accounting for approximately 1, 4, and 3% of the total decay in 2003, 2004, and 2005, respectively. In 2004 and 2005, severe losses of fruit were observed in three grower lots of Red Delicious, and their losses were as high as 24%. After 9 months in storage, 48, 48, and 24% of Red Delicious, Golden Delicious, and Fuji that were inoculated in the orchards, respectively, developed symptoms of this disease, and the fungus was reisolated from decayed fruit. Stem-end rot was common on Red Delicious and Golden Delicious, whereas calyx-end rot was common on Fuji. We propose “speck rot” as the name of this disease.

A comparison of different fruit thinning agents in apple cultivar ‘Golden Delicious’

2018 ◽  
pp. 9-16 ◽  
Author(s):  
W. Verjans ◽  
T. Deckers ◽  
J. Vandermaesen ◽  
D. Bylemans ◽  
S. Remy
Keyword(s):  
Apple Cultivar ◽  
Fruit Thinning ◽  
Golden Delicious

Fate of Escherichia coli O157:H7 in Ground Apples Used in Cider Production

1998 ◽  
Vol 61 (10) ◽  
pp. 1372-1374 ◽  
Author(s):  
TOMEKA L. FISHER ◽  
DAVID A. GOLDEN
Keyword(s):  
Escherichia Coli ◽  
Statistical Difference ◽  
The Other ◽  
Escherichia Coli O157 ◽  
Apple Cultivar ◽  
Mold Growth ◽  
E Coli ◽  
Significant Difference ◽  
Golden Delicious ◽  
Pathogen Populations

Survival of Escherichia coli O157:H7 in ground Golden Delicious, Red Delicious, Rome, and Winesap apples stored at 4, 10, and 25°C was determined. E. coli O157:H7 populations were monitored for up to 18 days (4°C), 12 days (10°C), and 5 days (25°C), when mold contamination became visible. At 25°C, Red Delicious apples supported survival of E. coli O157:H7 better (P < 0.05) than the other cultivars, followed by Golden Delicious and Rome apples, which were not statistically different (P > 0.05). Winesap apples were the least favorable (P < 0.05) for survival of E. coli O157:H7 at 25°C. E. coli O157:H7 was recovered at similar rates from Golden Delicious and Red Delicious apples, (P > 0.05), but pathogen populations increased in both cultivars (P < 0.05) during storage at 25°C. At 10°C, survival of E. coli O157:H7 was poorest (P < 0.05) in ground Red Delicious apples, while there was no significant difference in survival of E. coli O157:H7 among ground Golden Delicious, Rome, or Winesap cultivars (P > 0.05). When stored at 4°C, Golden Delicious and Rome apples were not statistically different in supporting survival of the pathogen (P > 0.05) and there was no statistical difference in the recovery of E. coli O157:H7 from ground Red Delicious, Rome, and Winesap apples (P > 0.05). In general, apple pH increased during storage and was associated with mold growth. Results of this investigation indicate that there is no trend toward a particular apple cultivar supporting survival of E. coli O157:H7. However, variation in apple pH during storage can negatively or positively influence E. coli O157:H7 survival at 25 °C.

Pilot Testing of Pichia guilliermondii: A Biocontrol Agent of Postharvest Diseases of Citrus Fruit

1993 ◽  
Vol 3 (1) ◽  
pp. 47-52 ◽  
Author(s):  
S. Droby ◽  
R. Hofstein ◽  
C.L. Wilson ◽  
M. Wisniewski ◽  
B. Fridlender ◽  
...  
Keyword(s):  
Biocontrol Agent ◽  
Citrus Fruit ◽  
Postharvest Diseases ◽  
Pichia Guilliermondii ◽  
Pilot Testing
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