Efficiency of different Rhizoctonia solani inoculum source against sheath blight screening in rice under field conditions

2022 ◽  
Author(s):  
Mandeep Singh Hunjan ◽  
Sanjay Kumar ◽  
Jagjeet Singh Lore ◽  
Casiana M Vera Cruz
Keyword(s):  
Rhizoctonia Solani ◽  
Sheath Blight ◽  
Field Conditions ◽  
Inoculum Source

scholarly journals Rapid Determination of Rice Cultivar Responses to the Sheath Blight Pathogen Rhizoctonia solani Using a Micro-Chamber Screening Method

Plant Disease ◽  
2007 ◽  
Vol 91 (5) ◽  
pp. 485-489 ◽  
Author(s):  
Y. Jia ◽  
F. Correa-Victoria ◽  
A. McClung ◽  
L. Zhu ◽  
G. Liu ◽  
...  
Keyword(s):  
Rhizoctonia Solani ◽  
Field Experiments ◽  
Rapid Determination ◽  
Selection Process ◽  
Screening Method ◽  
Sheath Blight ◽  
Field Conditions ◽  
Economic Losses ◽  
Transparent Plastic ◽  
Wide Range

An accurate greenhouse screening method has not been developed previously to identify host response to sheath blight disease caused by Rhizoctonia solani Kühn that causes significant economic losses in rice yield worldwide. The unavailability of a robust screening system in the greenhouse has made it difficult to quantify disease reactions to R. solani, and has hampered studies on the genetics of resistance and plant breeding efforts to improve resistance. In an effort to develop a standardized laboratory micro-chamber screening method to quantify resistance to R. solani in rice, five rice cultivars, representing a wide range of observed disease reactions under field conditions, were examined in a blind inoculation test at three locations (Arkansas, Texas, and Colombia). Rice seedlings were inoculated at the three- to four-leaf stage with potato dextrose agar plugs containing mycelium and then covered with a 2- or 3-liter transparent plastic bottle for maintaining high humidity after inoculation. Two cultivars, Jasmine 85 and Lemont, that consistently have shown the highest and lowest levels of resistance, respectively, in previous field and greenhouse studies, were used as standards. Concurrent field experiments in Arkansas and Texas also were performed to compare the greenhouse disease ratings with those observed under field conditions. Overall, the relative disease ratings of the seven test cultivars were consistent between test locations and with field evaluations. Thus, the micro-chamber screening method can be used as an effective approach to accurately quantify resistance to the sheath blight pathogen under controlled greenhouse conditions and should help expedite the selection process to improve resistance to this important pathogen.

Efficiency of axenically grown Rhizoctonia solani inoculum types in evaluating sheath blight development on rice genotypes

2021 ◽  
Author(s):  
Jagjeet S. Lore ◽  
Jyoti Jain ◽  
Mandeep S. Hunjan ◽  
Ishwinder Kamboj ◽  
Najam W. Zaidi ◽  
...  
Keyword(s):  
Rhizoctonia Solani ◽  
Sheath Blight ◽  
Rice Genotypes

Effects of straw incorporation on Rhizoctonia solani inoculum in paddy soil and rice sheath blight severity

2013 ◽  
Vol 152 (5) ◽  
pp. 741-748 ◽  
Author(s):  
H. ZHU ◽  
Z. X. WANG ◽  
X. M. LUO ◽  
J. X. SONG ◽  
B. HUANG
Keyword(s):  
Rhizoctonia Solani ◽  
Disease Severity ◽  
Rice Straw ◽  
Paddy Soil ◽  
Sheath Blight ◽  
Soil Productivity ◽  
Rice Sheath Blight ◽  
Important Method ◽  
Pathogen Dynamics ◽  
Straw Incorporation

SUMMARYIncorporation of rice straw into soil has traditionally been an important method of recycling nutrients and improving soil productivity. Currently, although the effects of straw incorporation on disease severity have been documented, the dynamics of the pathogen in soil after straw incorporation are poorly understood. In the present study, rice straw with various proportions of diseased straw was incorporated at three separate locations (SuPu town, SuSong County and FengYang County) in Anhui province, China. The pathogen dynamics in paddy soil and disease severity of sheath blight during two continuous years from April 2010 to April 2012 were investigated. For all three locations, the amount of pathogen inoculum that persisted in the soil increased with increases in the proportion of diseased straw incorporated. Incorporation of 0·3 and 0·5 diseased straw into soil increased the amount of pathogen inoculum in the soil significantly, whereas incorporation of 0·1 diseased straw into soil had no significant effect on the pathogen inoculum compared with the control (no straw incorporated) or disease severity. Incorporation of healthy rice straw (no disease) resulted in a significant decrease in disease severity, whereas proportions of 0·3 and 0·5 diseased straw resulted in a significant increase of disease severity compared with the control. These results suggested that incorporation of diseased straw enhanced pathogen numbers in soil during the whole decomposition period and increased disease severity. To avoid soil-borne disease accumulation, severely diseased straw should be removed from the field or pre-treated before incorporation.

Functional analysis of polygalacturonase gene RsPG2 from Rhizoctonia solani, the pathogen of rice sheath blight

2017 ◽  
Vol 149 (2) ◽  
pp. 491-502 ◽  
Author(s):  
Xijun Chen ◽  
Li Lili ◽  
Yun Zhang ◽  
Jiahao Zhang ◽  
Shouqiang Ouyang ◽  
...  
Keyword(s):  
Functional Analysis ◽  
Rhizoctonia Solani ◽  
Sheath Blight ◽  
Rice Sheath Blight ◽  
Polygalacturonase Gene

scholarly journals In Vitro Efficacy of Five Biofungicides against Rhizoctonia solani Kuhn in Rice

2020 ◽  
Author(s):  
Irish Mae Bauzon-Cantila ◽  
Jaime C. Silvestre ◽  
Raquel B. Evangelista ◽  
Edralyn Catubay
Keyword(s):  
Rhizoctonia Solani ◽  
Aloe Vera ◽  
Fungal Disease ◽  
Sheath Blight ◽  
Low Risk ◽  
High Yield ◽  
Melaleuca Alternifolia ◽  
Causal Pathogen ◽  
Chemical Fungicides

ABSTRACTRhizoctonia solani Kuhn, the causal pathogen of sheath blight is second most damaging fungal disease in rice. While using chemical fungicides present high detriment to environment, the study investigate the efficacy of treatments composing five biofungicides in three different rates along with a biological agent, chemical check and untreated against the pathogen in in vitro level. In vitro efficacy showed that Melaleuca alternifolia + terpenes at 3.00 ml/L of H20 (T6), Aloe vera powder (Manopol) + Melaleuca oil at 3.00 ml/L of H20 (T15) and at 2.00 ml/L of H20 (T14) and Melaleuca alternifolia + terpenes at 2.00 ml/L of H20 (T5) as very effective (0-10 mm diameter zone of growth) treatments comparable to the chemical check (T17). Therefore, attaining high yield rice while having low risk to environment can always be done.

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