Establishment of the irrigated rice cultivar SCSBRS Tio Taka by recurrent selection

False smut (Ustilaginoidea virens) is an important emerging disease of rice (Oryza sativa) in the southern United States, where all major rice cultivars and hybrids are susceptible to the disease. False smut susceptibility was evaluated in traditional paddy-rice fields and under furrow-irrigated conditions to determine the effects of alternative agricultural practices on the severity of this disease. Highly effective false smut suppression was observed in furrow-irrigated rice, where the disease was nearly eliminated in susceptible rice entries. False smut suppression was observed for two hybrids and one conventional rice cultivar, demonstrating that suppression was not limited to specific germplasm sources. Kernel smut severity was also monitored, but no effect on this disease was observed from the irrigation treatments. Therefore, suppression of disease severity in nonflooded rice appears to be a phenomenon unique to the rice–false smut pathosystem, which can be exploited to achieve effective field resistance to this disease.

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Symptoms of Fusarium graminearum infection in irrigated rice grains

Ciência Rural ◽

10.1590/0103-8478cr20180831 ◽

2019 ◽

Vol 49 (3) ◽

Author(s):

Bruno Tabarelli Scheidt ◽

Juliano Berghetti ◽

Eduardo José Zanella ◽

Ricardo Trezzi Casa ◽

Diego Bevilaqua ◽

...

Keyword(s):

Fusarium Graminearum ◽

Species Complex ◽

Rice Cultivar ◽

Irregular Shape ◽

Flowering Stage ◽

Irrigated Rice ◽

Rice Grains ◽

Filling Stage ◽

Shape And Size

ABSTRACT: The fungus Fusarium graminearum was one of the first pathogens described as causing infections in rice; however, in Brazil, there is no description of its occurrence in panicles. The present study aimed to describe the symptoms caused by F. graminearum infection in irrigated rice grains. The experiment was conducted in a greenhouse in duplicate using the irrigated rice cultivar SCS 121CL and hybrid INOV CL at the R4 (flowering) stage. Two isolate of Fusarium graminearium species complex 15A (F. graminearium - 15-ADON) and FmNiv (F. meridionale - Nivalenol), was inoculated onto panicles by spraying with macroconidia and the development of symptoms was monitored until harvest. There was no difference in symptoms among isolates. Light brown spots were observed in the glumes three days after inoculation. These later evolved into brown lesions of irregular shape and size. The glume darkened to purple when the grains were in the filling stage (R6). On maturation, the glume showed dark brown coloration. Severely infected grains were shriveled and brittle.

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Soluble tissue sugar content and leaf blast severity in response to the application of calcinated serpentinite as a silicon source in irrigated rice

Summa Phytopathologica ◽

10.1590/s0100-54052007000400014 ◽

2007 ◽

Vol 33 (4) ◽

pp. 402-404 ◽

Cited By ~ 2

Author(s):

Anne Sitarama Prabhu ◽

Alberto Baêta dos Santos ◽

Agostinho Dirceu Didonet

Keyword(s):

Field Experiment ◽

Grain Yield ◽

Sugar Content ◽

Rice Cultivar ◽

Leaf Blast ◽

Irrigated Rice ◽

Silicon Source ◽

Sugar Levels ◽

The Relationship ◽

Total Tissue

A field experiment conducted with the irrigated rice cultivar BRS Formoso, to assess the efficiency of calcinated serpentinite as a silicon source on grain yield was utilized to study its effect on leaf blast severity and tissue sugar levels. The treatments consisted of five rates of calcinated serpentinite (0, 2, 4, 6, 8 Mg.ha-1) incorporated into the soil prior to planting. The leaf blast severity was reduced at the rate of 2.96% per ton of calcinated serpentinite. The total tissue sugar content decreased significantly as the rates of serpentinite applied increased (R² = 0.83). The relationship between the tissue sugar content and leaf blast severity was linear and positive (R² = 0.81). The decrease in leaf blast severity with increased rates of calcinated serpentinite was also linear (R²= 0.96) and can be ascribed to reduced sugar level.

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Systems and rates of aerial application of fungicides in irrigated rice

Revista Brasileira de Engenharia Agrícola e Ambiental ◽

10.1590/1807-1929/agriambi.v22n2p143-147 ◽

2018 ◽

Vol 22 (2) ◽

pp. 143-147

Author(s):

Tânia Bayer ◽

Milton F. Cabezas-Guerrero ◽

Casimiro D. Gadanha Junior ◽

Alci E. Loeck

Keyword(s):

Chromatographic Analysis ◽

Rice Cultivar ◽

Application Rate ◽

Hollow Cone ◽

Active Ingredients ◽

Aerial Application ◽

Irrigated Rice ◽

Application Rates ◽

Droplet Density ◽

Leaf Canopy

ABSTRACT The present research studied the performance of flat-fan and hollow-cone nozzles, with application rates of 20 and 30 L ha-1, and rotary disc atomizer with application rates of 10 and 15 L ha-1. The test was conducted with a fungicide spray tank composed of Azoxystrobin + Difenoconazole, in which the density and penetration of droplets into the canopy were evaluated using a water-sensitive paper and the distribution of the active ingredients in the plant was evaluated through the chromatographic analysis. Higher application rates resulted in higher droplet density in the upper stratum of plants. In all treatments, the penetration of the droplets was 26% into the middle stratum and 23% into the lower stratum, in relation to the top of the crop, resulting in an average 25% penetration of droplets into the leaf canopy. The active ingredients were distributed in greater quantity in the upper stratum of the plant. For the same weight, the upper part of the ‘Puitá Inta CL’ rice cultivar has a leaf area 6.4 times larger than the lower part. It was concluded that higher application rate leads to higher droplet density in the upper stratum of the leaf canopy and that all systems and application rates promoted similar penetration of droplets into the canopy.

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BRS Jaburu - Irrigated rice cultivar for the states of Goiás and Tocantins

Cropp Breeding and Applied Biotechnology ◽

10.12702/1984-7033.v02n03a20 ◽

2002 ◽

Vol 2 (3) ◽

pp. 479-480 ◽

Cited By ~ 1

Author(s):

V.A. Cutrim ◽

P.H.N. Rangel

Keyword(s):

Rice Cultivar ◽

Irrigated Rice

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Grain yield gains in three recurrent selection cycles in the CNAIRAT 4 irrigated rice population

Cropp Breeding and Applied Biotechnology ◽

10.12702/1984-7033.v02n03a07 ◽

2002 ◽

Vol 2 (3) ◽

pp. 369-374 ◽

Cited By ~ 3

Author(s):

P.H.N. Rangel ◽

O.P. Morais ◽

F.J.P. Zimmermann

Keyword(s):

Grain Yield ◽

Recurrent Selection ◽

Irrigated Rice

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Control ofEchinochloasp. in the Irrigated Rice Crop

International Journal of Agronomy ◽

10.1155/2014/931840 ◽

2014 ◽

Vol 2014 ◽

pp. 1-6 ◽

Cited By ~ 2

Author(s):

Luís Eduardo Panozzo ◽

Dirceu Agostinetto ◽

Pedro Valério Dutra de Moraes ◽

Deivid Araújo Magano ◽

Adilson Harter ◽

...

Keyword(s):

Management Practices ◽

Block Design ◽

Rice Cultivar ◽

Herbicide Application ◽

Irrigated Rice ◽

Rice Farmers ◽

Randomized Block Design ◽

Efficient Control ◽

Treatment Application ◽

Plot Design

The species ofEchinochloa(barnyardgrass) stand out among major weeds infesting rice cropping and damages are variable depending on the weed population, rice cultivar, and management practices adopted by rice farmers. The objective of this work was to measure the control of barnyardgrass in rice cropping, cultivar Qualimax 1, due to the early times of flood irrigation, application times, and doses of penoxsulam. The experiment was conducted in the field, where the experimental design used a randomized block design with a split plot design with four replications. The treatments consisted of two application periods (early and late) of penoxsulam three times of irrigation start (1, 15 and 30 days after treatment application—(DAT)) and herbicide doses (0, 24, 36, 48 and 60 g ha−1). The herbicide penoxsulam revealed that combined with irrigation starting 15 days after herbicide application promoted efficient control of barnyardgrass.

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Genetic diversity and virulence pattern in field populations of Pyricularia grisea from rice cultivar Metica-1

Pesquisa Agropecuária Brasileira ◽

10.1590/s0100-204x2002001200002 ◽

2002 ◽

Vol 37 (12) ◽

pp. 1681-1688 ◽

Cited By ~ 8

Author(s):

Marta Cristina Filippi ◽

Anne Sitarama Prabhu ◽

Leila Garcês de Araújo ◽

Josias Correa de Faria

Keyword(s):

Genetic Diversity ◽

Rice Cultivar ◽

Pcr Analysis ◽

Pyricularia Grisea ◽

Sample Population ◽

Pathogen Population ◽

Leaf Blast ◽

Irrigated Rice ◽

Virulence Pattern ◽

Cultivar Specificity

Rice blast is a major yield constraint of the irrigated rice in the State of Tocantins, Brazil. The objective of this investigation was to study the phenotypic and genetic diversity within the pathogen population of Pyricularia grisea in samples collected from four individual farms of rice cultivar Metica-1, under epidemic conditions of leaf blast. A set of 87 isolates was tested on 32 rice genotypes including eight international differentials. Considering 80% similarity in virulence, two groups comprising a total of 81 isolates were recognized, independently of the farms from which they were collected. Eighty percent of the isolates pertained to pathotype ID-14, indicating high cultivar specificity and narrow diversity of virulence in the sample population. The virulence in pathogen population on rice cultivars BR-IRGA 409 and Rio Formoso was low. Analysis of P. grisea isolates using rep-PCR with two primer sequences from Pot2 generated fingerprint profiles of one to nine bands. Cluster analysis revealed the occurrence of six fingerprint groups with similarities ranging from 0.09 to 1. There was no straight relationship between virulence of the isolates based on reaction pattern on 32 genotypes and grouping based on Pot2 rep-PCR analysis of P. grisea isolates collected from 'Metica-1'.

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