Studies on the survival of corn stalk rot bacteria

1970 ◽  
Vol 33 (1-3) ◽  
pp. 140-144 ◽  
Author(s):  
M. Rangarajan ◽  
B. P. Chakravarti
Keyword(s):  
Corn Stalk ◽  
Stalk Rot

Isolation and evaluation of aBacillus methylotrophicusstrain for control of corn stalk rot

2016 ◽  
Vol 26 (5) ◽  
pp. 727-731 ◽  
Author(s):  
Yonggang Li ◽  
Xiaobing Geng ◽  
Pingsheng Ji ◽  
Chunqing Pan ◽  
Shi Wei
Keyword(s):  
Corn Stalk ◽  
Stalk Rot

First report of corn stalk rot caused by Dickeya zeae on sweet corn in Shanghai, China

2019 ◽  
Vol 102 (2) ◽  
pp. 557-558
Author(s):  
Yuan Guan ◽  
Wen Chen ◽  
Yuxin Wu ◽  
Yingxiong Hu ◽  
Hui Wang ◽  
...  
Keyword(s):  
Sweet Corn ◽  
Corn Stalk ◽  
First Report ◽  
Stalk Rot

scholarly journals The Relationship Analysis on Corn Stalk Rot and Ear Rot According to Fusarium Species and Fumonisin Contamination in Kernels

Toxins ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 320 ◽  
Author(s):  
Lina Li ◽  
Qing Qu ◽  
Zhiyan Cao ◽  
Zhengyu Guo ◽  
Hui Jia ◽  
...  
Keyword(s):  
Fusarium Species ◽  
Fusarium Verticillioides ◽  
Contamination Rate ◽  
Corn Stalk ◽  
Ear Rot ◽  
Stalk Rot ◽  
Relationship Analysis ◽  
Corn Root Rot ◽  
Corn Kernels ◽  
The Relationship

Fusarium diseases, including corn root rot, sheath rot, stalk rot, and ear rot are frequently occurring in maize producing areas of China. Fusarium stalk rot and ear rot are the most serious diseases and often occur at the same time, but it is unclear whether there is a correlation between Fusarium composition and disease occurrence. This study was conducted to clarify the relationship between the two diseases. A total of 49 corn stalk rot samples were collected from 15 regions of eight provinces in China from 2016 to 2018. The pathogens were isolated and identified separately from stalks, ear stems, and kernels. The contents of the fumonisins (FB1 and FB2) were detected in kernels. The results showed that the main Fusarium species were found in corn kernels, ear stems and stalks at the same time. The results showed that 1201 strains of Fusarium verticillioides, 668 strains of Fusarium oxysporum, 574 strains of Fusarium graminearum species complex (FGSC), 318 strains of Fusarium equiseti, 95 strains of Fusarium proliferatum, and 40 strains of Fusarium subglutinans were isolated from 1470 corn kernels, 245 ear stems, and 1225 stalks randomly selected from 49 samples. The contamination rate of fumonisins in the 49 samples was 57.1% with an average content of 1.9 μg/g, of which four samples exhibited higher levels as set by the European Commission (4.0 μg/g). These results provide a certain association between stalk rot and ear rot and lay a foundation to study the relationships among Fusarium maize diseases.

Effect of soil solarization on corn stalk rot

1996 ◽  
Vol 179 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Yasmin Ahmad ◽  
A. Hameed ◽  
M. Aslam
Keyword(s):  
Soil Solarization ◽  
Corn Stalk ◽  
Stalk Rot

scholarly journals First Report of Phytopythium helicoides Causing Stalk Rot on Corn in China

Plant Disease ◽  
2021 ◽  
Author(s):  
Xueying Xie ◽  
Hongzi Zhou ◽  
Susu Fan ◽  
Xinjian Zhang
Keyword(s):  
Relative Humidity ◽  
Cytochrome C ◽  
Cytochrome C Oxidase ◽  
Negative Control ◽  
Corn Stalk ◽  
Fusarium Spp ◽  
First Report ◽  
Stalk Rot ◽  
Leaf Stage ◽  
Corn Plants

Corn (Zea mays L.) is one of the most important grain crops in the world, especially in China. Besides, corn stalks are often used in production of bio-fuels (Xue et al., 2017). Recently, the production and quality of corn have been severely influenced by corn stalk rot in China caused by Fusarium spp. (Yu et al., 2017). At the end of June of 2019, a field survey of corn was carried out in Tai’an City, western Shandong Province, China. During the survey, the average day time temperature ranged between 22-28°C with intermittent rainfall, the relative humidity was 50-70%. In this survey, the symptomatic corn plants showed signs of necrosis and rotting on stalks and root collars. Five fields were surveyed and symptomatic corn plants were observed in three fields. The incidence rate of disease was about 5%, and the disease was more of a problem in low-lying areas. A total of twenty-eight symptomatic corn plants (7-12 per field), hybrid Denghai-618, at the 3-4 leaf stage were collected and tested for the presence of pathogens. The diseased tissues were excised, surface-sterilized with 75% ethanol for 30 seconds, rinsed for 3 to 5 times with sterile distilled water, and plated on potato dextrose agar (PDA). All plates were incubated at 28°C for 48 hours, emerging colonies were sub-cultured onto PDA plates. Forty-two isolates were obtained, and twenty-seven isolates were identified as Fusarium spp. The remaining fifteen isolates had similar morphology, with colonies that were white and cottony in texture after incubation at 28°C for three days on PDA. The suitable temperature range for growth of hyphae was between 15°C to 40°C, and sporangia were ellipsoidal, papillate, and 23 - 34×21 - 31 µm in diameter. Oogonia (smooth, 22 - 30 μm in diameter) were present in the cultures after 28 days at 28°C. The isolates were identified using both morphological characteristics and DNA sequencing. Identity of the oomycete was confirmed using the BLAST algorithm available through the GenBank with the DNA sequences of rDNA internal transcribed spacer region (ITS), cytochrome c oxidase Ⅰ (coxⅠ) gene and cytochrome c oxidase Ⅱ (coxⅡ) gene, which were amplified using the primers ITS1/ITS4 (White et al. 1990), FM35/FM59 and FM66/FM58 (Martin 2000), respectively. The fifteen isolates selected for sequence analysis had identical gene sequences, and hence, only sequences for isolate RMSD1 were submitted to GenBank (ITS - MW440691, coxI - MW450815 and cox II - MW450816). The ITS, coxI and coxII sequences of the isolate RMSD1 showed 97% identity (751/774 bp), 99% identity (1087/1098 bp) and 99% identity (548/554 bp) with Phytopythium helicoides Accession nos: HQ643382, FR774199, and AB108014, respectively. The pathogenicity of RMSD1 was tested on the corn hybrid Denghai-618. Three-leaf-stage corn plants (N = 15) were inoculated with mycelial agar disks (3 to 4 mm in diameter) colonized with RMSD1 placed on their root-collars. Sterile PDA disks (3 to 4 mm in diameter) served as the negative control (N = 9). Inoculated plants were placed in the growth chamber at 28°C, 60% relative humidity, 16 h / 8 h light regime cycle. Ten days post-inoculation, the inoculated plants showed necrosis, with symptoms of stem rot similar to those observed in the field. The inoculation experiments were repeated twice with the same results, fulfilling Koch’s postulates. The root-collars and stems of negative control remained asymptomatic, and P. helicoides was not isolated. Previously, P. helicoides has been reported as a pathogen of strawberry (Zhan et al. 2020) and kiwi fruits (Wang et al. 2015) from China, but not from corn. To our knowledge, it is the first report of P. helicoides causing corn stalk rot in China. In the future, P. helicoides can be considered as a potential candidate causing stem and collar-rot of corn in China, but not the only one. There are other microbes that can produce similar symptoms on corn, and control methods for pathogenic oomycetes differ from those for fungi.

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