Chemical Control of Seedling Diseases of Rice in Louisiana

Rush, M. C.; Schneider, R. W.

doi:10.1007/978-94-009-0775-1_4

Cited by 3 publications

(6 citation statements)

References 3 publications

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“…The disease is commonly present throughout the rice‐growing areas in the southern United States. However, it becomes more severe in early plantings when soil temperature is relatively low, which is unfavourable for the growth of rice seedlings (Rush & Schneider, 1990). Seedling blight causes stands of rice to be spotty, irregular and thin, leading to replanting under severe conditions.…”

Section: Discussionmentioning

confidence: 99%

“…In this multistate survey, no Pythium and Phytophthora isolates were recovered from any rice samples. Previously, these oomycetes species were thought to be among the important soilborne pathogens causing stand loss in rice (Rush, 1992; Rush & Schneider, 1990; Zhou & Jo, 2014). Rush and Schneider (1990) reported that rice seedling disease caused by the genus Pythium was most common in the Louisiana water‐seeded rice production system.…”

Section: Discussionmentioning

confidence: 99%

“…Previously, these oomycetes species were thought to be among the important soilborne pathogens causing stand loss in rice (Rush, 1992;Rush & Schneider, 1990;Zhou & Jo, 2014). Rush and Schneider (1990) reported that rice seedling disease caused by the genus Pythium was most common in the Louisiana water-seeded rice production system. Pythium dissotocum, P. spinosum, P. irregulare, P. arrhenomanes and P. graminicola were among the soilborne pathogens causing seedling blight in the dry-seeded rice production system in the southern United…”

Section: Pathogenicity Testsmentioning

confidence: 99%

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Identification and distribution of fungal pathogens associated with seedling blight of rice in the southern United States

Gaire¹,

Zhou²,

Zhou

et al. 2022

Plant Pathology

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Surveys were conducted in the five southern rice‐producing states of Arkansas, Louisiana, Mississippi, Missouri and Texas in the United States during the 2018 and 2019 cropping seasons to determine the distribution and pathogenicity of fungal pathogens associated with seedling blight in rice. A total of 349 pathogenic fungal isolates were collected and identified as belonging to four genera: Rhizoctonia solani, Fusarium spp., Sclerotium rolfsii and Marasmius graminum based on morphological characteristics, molecular analysis and Koch's postulates. R. solani (252 out of 349 pathogenic isolates) was the most prevalent fungus isolated from diseased samples. Of the 252 pathogenic R. solani isolates, 245 were further classified as anastomosis group 11 (AG‐11) and 7 as AG‐4. Isolates of R. solani AG‐4 and M. graminum were the most aggressive, with the highest stand loss (63% to 100%) and median disease rating (DR; 5.0), followed by isolates of R. solani AG‐11 (stand loss = 4% to 100% and DR = 0.6 to 5.0), Fusarium spp. (stand loss = 26% to 48% and DR = 2.0 to 5.0) and S. rolfsii (stand loss = 33% to 48% and DR = 2.0 to 3.0) in causing seedling blight in rice. R. solani (62% to 83% of total pathogenic isolates) and Fusarium spp. (10% to 24% of total pathogenic isolates) were predominant in all the five states surveyed. S. rolfsii and M. graminum were present only in Louisiana and Texas. The results of this first systematic survey of rice seedling diseases in the southern United States will help develop effective fungicide seed treatment strategies for control of stand loss caused by seedling blight, one of the major factors limiting rice production.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Pathogenicity Testsmentioning

confidence: 99%

See 1 more Smart Citation

Identification and distribution of fungal pathogens associated with seedling blight of rice in the southern United States

Gaire¹,

Zhou²,

Zhou

et al. 2022

Plant Pathology

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“…Reports on the management of diseases in rice seed and seedlings to date are limited. Chemical fungicides have been used to control rice seed and seedling diseases caused by different fungal pathogens, with these including carbendazim ® , difolatan ® , mancozeb ® , propiconazole ® , and validamycin ® [52][53][54][55][56].…”

Section: Discussionmentioning

confidence: 99%

Biocontrol of Rice Seedling Rot Disease Caused by Curvularia lunata and Helminthosporium oryzae by Epiphytic Yeasts from Plant Leaves

2020

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Seedling rot disease in rice leads to significant loss in the production of seedlings. This research was conducted to explore yeasts that could be used as biological control agents against rice seedling rot disease caused by Curvularia lunata and Helminthosporium oryzae. In total, 167 epiphytic yeast strains were evaluated, revealing that 13 of these yeast strains demonstrated antagonistic activities against fungal pathogens and either C. lunata DOAC 2313 or H. oryzae DOAC 2293. The volatile organic compounds (VOCs) and biofilm produced were possible antagonistic mechanisms in vitro for all the antagonistic yeast strains. Using nursery trays in a greenhouse, this study evaluated the control of rice seedling rot disease caused by these two fungal pathogens using antagonistic yeasts, identified in the present study and from our previous study. Torulaspora indica DMKU-RP31 and Wickerhamomyces anomalus YE-42 were found to completely control rice seedling rot disease caused by both of these fungal pathogens. Furthermore, W. anomalus DMKU-RP04 revealed 100% disease control when the disease was caused by H. oryzae. This is the first report on using antagonistic yeasts to control rice seedling rot disease caused by C. lunata and H. oryzae. These three antagonistic yeasts also showed promising potential for development as biocontrol agents against rice seedling rot disease caused by fungi.

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“…RSB is a serious soil-borne disease observed worldwide and caused by multiple pathogens, including Fusarium oxysporum [4,11], F. tricinctum [12], Curvu1aria lunata [13],…”

Section: Introductionmentioning

confidence: 99%

Biological Control Ability and Antifungal Activities of Bacillus velezensis Bv S3 against Fusarium oxysporum That Causes Rice Seedling Blight

Jiang,

Liu,

et al. 2024

Agronomy

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Fusarium oxysporum, a primary soil-borne fungus that affects rice seedlings globally, is responsible for rice seedling blight (RSB), which reduces seedling quality and survival rates. The synthetic fungicides used to treat this disease negatively affect human health and the environment. A biocontrol bacterial isolate, Bacillus velezensis Bv S3, isolated from the rice rhizosphere, showed a strong antagonistic effect on RSB-causing F. oxysporum. The ratio of the longest to the shortest radius of F. oxysporum following Bv S3 inoculation was 2.52 (cm/cm) in a plate standoff experiment. This was different from the other biocontrol strains. Bv S3 exhibits a wide spectrum of antifungal activity against various pathogenic fungi that cause RSB. When 10% Bv S3 liquid culture filtrate was applied, it dramatically reduced F. oxysporum spore germination and mycelial growth, with inhibition rates of 66.7%, and 45.7%, respectively, and caused hyphal malformations. Furthermore, the Bv S3 suspension (1 × 108 CFU/mL) reduced RSB by 65.5% and 76.5% in pot experiments, effectively promoted the growth of rice seedlings, and improved the activities of neutral phosphatase, urease, invertase, and catalase in rice rhizosphere soil. The active substances produced by Bv S3 were sensitive to temperature and ultraviolet irradiation, and the antifungal effect significantly increased after 90 min of exposure, with antifungal effect observed at pH 7. Bv. S3 effectively reduced the incidence of RSB and showed potential as a biocontrol agent.

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Chemical Control of Seedling Diseases of Rice in Louisiana

Cited by 3 publications

References 3 publications

Identification and distribution of fungal pathogens associated with seedling blight of rice in the southern United States

Identification and distribution of fungal pathogens associated with seedling blight of rice in the southern United States

Biocontrol of Rice Seedling Rot Disease Caused by Curvularia lunata and Helminthosporium oryzae by Epiphytic Yeasts from Plant Leaves

Biological Control Ability and Antifungal Activities of Bacillus velezensis Bv S3 against Fusarium oxysporum That Causes Rice Seedling Blight

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