Screening of Rice Varieties against Brown Leaf Spot Disease at Jyotinagar, Chitwan, Nepal

Magar, Prem Bahadur

doi:10.3126/ijasbt.v3i1.12014

Cited by 9 publications

(8 citation statements)

References 8 publications

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“…The present study results demonstrated varying responses of pigmented upland rice cultivars to brown leaf spot. Similar results have previously been observed in white-lowland rice by several studies (Percich et al1997;Hossain and Kulkarni 2001;Magar 2015;Pantha et al 2017). Using the same disease severity rating scale (IRRI 2002), the disease severity (11.11-40.70%) and total AUDPC (398.42-1081.30%-days) ranges of the present study were a bit lower than that observed by Magar (2015), who recorded disease severity and AUDPC value ranges of, respectively, 21.73-58.07% and 614.8-1827%-days.…”

Section: Discussionsupporting

confidence: 90%

“…Similar results have previously been observed in white-lowland rice by several studies (Percich et al1997;Hossain and Kulkarni 2001;Magar 2015;Pantha et al 2017). Using the same disease severity rating scale (IRRI 2002), the disease severity (11.11-40.70%) and total AUDPC (398.42-1081.30%-days) ranges of the present study were a bit lower than that observed by Magar (2015), who recorded disease severity and AUDPC value ranges of, respectively, 21.73-58.07% and 614.8-1827%-days. These differences presumably occurred due to different rice genotypes being tested (24 genotypes in this study and 14 genotypes in the study by Magar (2015) In addition to genotypic differences, the difference in total AUDPC might have happened due to difference in number of disease assessments carried out as total AUDPC is the accumulation of all the recorded disease severity during the experimental period.…”

Section: Discussionsupporting

confidence: 90%

“…Brown spot resistant genotype was lacking in the present study while six moderately resistant genotypes were identified out of total 24 test genotypes. Similar to this study, Magar (2015) observed no brown spot resistant genotype, and only two moderately resistant varieties were identified from 14 low lowland rice varieties evaluated. Arshad et al (2008) found only one entry among seventy entries was resistant against brown leaf spot.…”

Section: Discussionsupporting

confidence: 86%

“…Control of brown spot can be done through various methods, including the use of disease-free seeds, the use of resistant varieties, balanced nutrition, avoidance of water deficit, and fungicide spray (Ou 1985;Mew and Gonzales 2002;Zadoks 2002;Mandal and Jha 2008;Asghar et al 2019). Among these, the use of resistant varieties is the most economical and eco-friendly way of controlling the disease (Haq et al 2002;Mew and Gonzales 2002;Zadoks 2002;Magar 2015). However, the resistant varieties are limitedly available and the resistance is not stable due to the appearance of new virulent races of the pathogen (Goel et al 2006;Asghar et al 2007;Katasntones et al 2007;Arshad et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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Brown spot disease severity, yield and yield loss relationships in pigmented upland rice cultivars from East Nusa Tenggara, Indonesia

2020

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Abstract. Mau YS, Ndiwa ASS, Oematan SS. 2020. Brown spot disease severity, yield and yield loss relationships in pigmented upland rice cultivars from East Nusa Tenggara, Indonesia. Biodiversitas 21: 1625-1634. Brown spot is one of the most devastating diseases of rice, which could lead to total yield loss. The disease has a worldwide distribution, more specifically in areas where water supply is scarce, most specifically in the dry upland areas. Almost all stages of rice are affected by the disease, where leaves and grains are mostly affected. Considerable differences exist in susceptibility to brown spot among rice varieties, which may cause a large variation in yield loss caused by the disease. Therefore, the resistance level of rice varieties and their yield reduction has to be regularly evaluated and updated. There are only a few reports on the relationship between brown spot severity with yield and yield loss of upland rice, and is even lacking in pigmented upland rice. The objectives of the present study were to assess the brown spot severity and resistance level in pigmented upland rice cultivars from East Nusa Tenggara Province, Indonesia, and to elucidate their relationships with yield and yield reduction. Twenty four pigmented upland rice genotypes were evaluated in the field during May to October 2019, and their disease responses and yields were recorded. Disease severity was observed weekly and used to calculate Area Under the Disease Progress Curve (AUDPC) for comparison among the genotypes. The relationships between disease severity and AUDPC with yield and yield loss were also examined. The results showed significant variation in brown spot severity and AUDPC, ranging from, respectively, 11.11% to 40.70% and 398.42%-days to 1081.30%-days. Yields and yield losses of test genotypes also varied substantially. Yields under diseased-free and diseased plots ranged from, respectively, 2.34 t ha-1 to 6.13 t ha-1 and 1.68 t ha-1 to 3.74 t ha-1 while yield loss was between 10.46% and 56.15%. Six genotypes were moderately resistant, four genotypes were moderately susceptible and 14 genotypes were susceptible to brown spot. Neither disease severity nor AUDPC had a linear relationship with yield but both exhibited positive and linear relationships with yield loss.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

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Brown spot disease severity, yield and yield loss relationships in pigmented upland rice cultivars from East Nusa Tenggara, Indonesia

2020

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“…It is also observed previously paddy variety differ in utilization of silicon from the soil. (Ma et al, 2007;Sahebi et al, 2017), and varietal difference were also observed in the incidence of brown spot disease Magar (2015), varieties like Kala Namak, Ganga Kaveri, are tall in height and very much prone to the lodging, which may be due to deficiency of Silicon in the soil and deferential ability of genotype of paddy to uptake silicon. Varieties like Kala Namak Dwarf, NP 360, Shri Ram 502, NDR3112.NDR 359 and NDR 2064, have shown partial resistance to the disease may be up taking Si in some amount which is in support of work done by (Idris et al, 1975;Majumadar et al, 1985).…”

Section: Area Under Disease Progress Curvementioning

confidence: 98%

Salt Tolerant Paddy Varieties, Showing Resistance to Brown Spot during Nursery Stage

Chandra¹,

Tiwari²,

Singh³

et al. 2018

Int.J.Curr.Microbiol.App.Sci

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Proximally sensed RGB images and colour indices for distinguishing rice blast and brown spot diseases by k-means clustering: Towards a mobile application solution

Terensan,

Salgadoe,

Kottearachchi

et al. 2024

Smart Agricultural Technology

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Screening of Rice Varieties against Brown Leaf Spot Disease at Jyotinagar, Chitwan, Nepal

Cited by 9 publications

References 8 publications

Brown spot disease severity, yield and yield loss relationships in pigmented upland rice cultivars from East Nusa Tenggara, Indonesia

Brown spot disease severity, yield and yield loss relationships in pigmented upland rice cultivars from East Nusa Tenggara, Indonesia

Salt Tolerant Paddy Varieties, Showing Resistance to Brown Spot during Nursery Stage

Proximally sensed RGB images and colour indices for distinguishing rice blast and brown spot diseases by k-means clustering: Towards a mobile application solution

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