Disease incidence and yield loss in rice due to grain discolouration

Baite, Mathew S.; Raghu, S.; Prabhukarthikeyan, S.R.; Keerthana, U.; Jambhulkar, Nitiprasad Namdeorao; Rath, Prakash Chandra

doi:10.1007/s41348-019-00268-y

Cited by 14 publications

(13 citation statements)

References 5 publications

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“…More complex weather variables such as DPrecTRH and DWet1, which need relative humidity daily records (that are not always available in historical weather data) for their calculations, decreased slightly their correlations with RGDI. Several authors agree that high relative humidity subserve RGDI and disease severity (Baite et al, 2020;Chhabra & Vij, 2020;da Silva-Lobo et al, 2011), while others have found no correlation between relative humidity and RGDI (Rawte, 2007). Concerning precipitation, although it is widely mentioned as an influential factor, information regarding the amounts required to incentivize infection is scarce (Baite et al, 2020;dos Santos et al, 2009;Huang et al, 2011a).…”

Section: Discussionmentioning

confidence: 99%

Modelling of the effects of environmental factors on rice grain discoloration incidence in Corrientes province, Argentina

Dirchwolf

Moschini

Gutiérrez

et al. 2022

Journal of Phytopathology

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Rice grain discoloration (RGD) is a disease of complex aetiology for which there are no resistant varieties. Due to the need to better define the environmental conditions that favour the disease, the aims of this work were to (i) identify the predominant fungi associated, (ii) determine the meteorological variables most closely related, and (iii) develop preliminary weather‐based models to predict binary levels of RGD incidence. After analysing 123 rice grain samples under natural infection conditions from rice‐cropping regions throughout Corrientes province, Argentina, we found that RGD was mainly associated with Alternaria padwickii (14.2%) and Microdochium albescens (13.7%). The strongest associations between weather variables and RGD incidence were observed in a susceptible critical period (Scp) that extended from the rice flowering stage until 870 accumulated degree days (Scp lasting 32 days, ±7 days). The binary response logistic model including the weather variables DPrecT (which combined the effect of the simultaneous daily occurrence of precipitation lower than 12 mm and air temperature between 13 and 28°C), and DDMnT (sum of the exceeding amounts of daily min temperature from 23°C), was the most appropriate, showing prediction accuracy (PA) values of 84.6%. The univariate model that included DPrecT presented a PA of 82.1%. The logistic regression techniques here used to develop weather‐based models to estimate the probabilities of occurrence of binary levels of RGD can not only help to clarify and quantify the environmental effect on the development of RGD but also be useful tools to be included in future management strategies.

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Section: Discussionmentioning

confidence: 99%

Modelling of the effects of environmental factors on rice grain discoloration incidence in Corrientes province, Argentina

Dirchwolf

Moschini

Gutiérrez

et al. 2022

Journal of Phytopathology

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“…The losses due to grain discoloration were estimated approximately about 20-25 percent [72]. In our previous studies we reported that, the grain discoloration incidence ranged from 25 to 92% in different rice genotypes [73]. There may be a number of factors responsible for the disease starting from the varietal susceptibility, changed climatic conditions and agronomic managements which ultimately leads to the increased incidence of the disease with more damage.…”

Section: Identification Symptomsmentioning

confidence: 99%

Emerging Minor Diseases of Rice in India: Losses and Management Strategies

Shivappa¹,

Navadagi²,

Baite³

et al. 2022

Integrative Advances in Rice Research

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Rice (Oryza sativa L) being one of the imperative food crops of the word contributes immensely to the food and nutritional security of India. The cultivation of rice is changed over the decades from a simple cultivation practices to the advanced cultivation to increase yield. Increased in rice yields especially after 1960s is mainly due to the introduction of high yielding semi-dwarf varieties which requires more inputs like chemical fertilizers, water and other resources. As a result, India achieved self sufficiency in rice and currently producing more than 115 MT of rice to meet country’s demand. Now India is exporting rice to other nations and earning foreign returns. With the change in rice cultivation practices, problems also aroused side by side. A number of biotic and abiotic stresses emerged as major constraints for rice cultivation in diverse agro-climatic conditions and growing ecologies. Diseases are the major biotic constraints to rice which can reduce the yields by 20–100% based on severity. Major diseases like blast, brown spot, bacterial blight, sheath blight and tungro still causing more damage and new minor diseases like bakanae, false smut, grain discoloration, early seedling blight, narrow brown spot, sheath rot have emerged as major problems. The losses due to these diseases may 1–100% based on the growing conditions, varietal susceptibility etc.., At present no significant source of resistance available for any of the above emerging diseases. But looking into the severity of these diseases, it is very important to address them by following integrated management practices like cultural, mechanical, biological and finally chemical control. But more emphasis has to be given to screen gerrmplasm against these diseases and identify stable source of resistance. Finally utilizing these sources in resistance breeding program by employing molecular breeding tools like marker assisted selection (MAS), marker assisted back cross breeding (MABB), gene pyramiding and transgenic tools. The present chapter discusses the importance of these emerging minor diseases of rice, the losses and possible management measures including resistance breeding.

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“…It is grown in almost every part of the world [1] and about 90% of the world's rice comes from the Asian continent [2]. Rice farming is one of the principal sources of income and employment for the majority of households across the world [3,4]. It is an important cereal cultivated for food security and income by marginal farmers [5].…”

Section: Introductionmentioning

confidence: 99%

“…Rice blast has been regarded as one of the most damaging diseases of rice worldwide because of its high magnitude of destructiveness [2] and danger to global food security [6]. Rice blast epidemics in various parts of the world have resulted in about 50% to 90% and under extreme cases up to 100% losses in crop yield [3] compared to 20%-50% losses caused due to sheath blight, 50%-70% yield loss caused due to brown spot disease, 25% crop losses caused by bacterial leaf blight, and 20%-80% yield losses caused due to sheath rot disease [3]. Pre-harvest and post-harvest pest infestations of rice are yet another major yield-limiting factor that causes about 33% production loss [7].…”

Section: Introductionmentioning

confidence: 99%

“…The causative agent exists in diverse pathogenic forms, each carrying different virulence genes, and which frequently mutates to form new pathogen races [12]. It attacks the leaf part causing symptoms of leaf blast; it also affects the neck of the rice and causes neck blast [3]. The attack begins with the formation of spores that fall on leaves and stems and germinate to produce blast symptoms.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Mixture of Piper Leaves Extracts and Rhizobacteria for Sustainable Plant Growth Promotion and Bio-Control of Blast Pathogen of Organic Bali Rice

et al. 2020

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Rice is a crop that is consumed as a staple food by the majority of the people in the world and therefore failure in rice crops, due to any reason, poses a severe threat of starvation. Rice blast, caused by a fungus Pyricularia oryzae, has been ranked among the most threatening plant diseases of rice and it is found wherever rice is grown. All of the rice blast disease management strategies employed so far have had limited success and rice blast has never been eliminated from rice fields. Hence, there is a need to look for the best remedy in terms of effectiveness, sustainability, and organic nature of the method. This study was aimed at determining the plant growth-promoting and fungicidal effects of a mixture of Piper caninum and Piper betle var. Nigra leaves extracts and rhizobacteria. Gas chromatography–mass spectrophotometry (GC-MS) analysis of a mixture of leaves extracts of these plants revealed the presence of new bioactive compounds such as alpha.-gurjunene, gamma.-terpinene, and ethyl 5-formyl 3-(2-ethoxycarbonyl) in a mixture of leaves extracts of P. caninum and P. betle var. Nigra. The mixture of these extracts reduced the intensity of blast disease, inhibited P. oryzae, and improved the growth, yield, and quality of Bali rice. All treatments comprising of different concentrations of a mixture of leaves extracts of P. caninum and P. betle var. Nigra plus rhizobacteria exhibited biocontrol and bioefficacy. However, a 2% concentration of a mixture of these leaves extracts with plant growth-promoting rhizobacteria (PGPR) exhibited potent inhibition of growth of P. oryzae, a significant reduction in the intensity of blast disease, and a maximum increase in growth, yield, and quality of Bali rice. In the 15th week, the intensity of blast disease decreased from 80.18% to 7.90%. The mixture of leaves extract + PGPR also improved the height of the plant, the number of tillers, number of leaves, number of grains per panicle, number of heads per panicle, and the full-grain weight per clump. Applications of various concentrations of a mixture of leaves extracts + PGPR resulted in improvement in the potential yield of rice, however, the application of 2% extracts + PGPR gave the highest potential yield of 5.61 tha−1 compared to the low yields in the control and other treatments. The high grain yield observed with the treatment was caused by the low intensity of blast disease. This treatment also strengthened the stem and prevented the drooping of the plant and improved the quality of rice grain.

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Disease incidence and yield loss in rice due to grain discolouration

Cited by 14 publications

References 5 publications

Modelling of the effects of environmental factors on rice grain discoloration incidence in Corrientes province, Argentina

Modelling of the effects of environmental factors on rice grain discoloration incidence in Corrientes province, Argentina

Emerging Minor Diseases of Rice in India: Losses and Management Strategies

A Mixture of Piper Leaves Extracts and Rhizobacteria for Sustainable Plant Growth Promotion and Bio-Control of Blast Pathogen of Organic Bali Rice

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