scholarly journals Weed Management in Sprinkler-Irrigated Rice: Experiences from Southern Brazil

10.5772/67146 ◽  
2017 ◽  
Author(s):  
André Andres ◽  
Giovani Theisen ◽  
Gustavo Mack Teló ◽  
Germani Concenço ◽  
José Maria Barbat Parfitt ◽  
...  
Keyword(s):  
Weed Management ◽  
Southern Brazil ◽  
Irrigated Rice

scholarly journals Aeschynomene spp. Identification and Weed Management in Rice Fields in Southern Brazil

Agronomy ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 453
Author(s):  
Matheus B Martins ◽  
Dirceu Agostinetto ◽  
Silvia Fogliatto ◽  
Francesco Vidotto ◽  
André Andres
Keyword(s):  
Weed Management ◽  
Chemical Control ◽  
Management Practices ◽  
Rice Fields ◽  
Extension Agents ◽  
Southern Brazil ◽  
Rio Grande Do Sul ◽  
Irrigated Rice ◽  
Irrigation Uniformity ◽  
Mature Seeds

In 2002, a survey carried out in rice paddies in the Rio Grande do Sul (RS) state reported the occurrence of nine species of jointvetch (Aeschynomene). Due to their semi-aquatic habit, some species adapted to irrigated rice fields, which led to their being considered the worst broadleaf weed in RS. Although farmers have successfully implemented weed management practices, Aeschynomene plants have reportedly escaped chemical control. This study aims to identify the species of Aeschynomene that occur in rice fields in RS and to evaluate the reasons why escapes are occurring. A survey was carried out by collecting mature seeds from individual adult plants. A questionnaire on the management practices employed in each field was administered to 54 farmers and 18 extension agents, each of whom was responsible for one of the surveyed rice fields. This survey found four species of Aeschynomene are present in rice fields in RS: A. denticulata, A. indica, A. rudis, and A. sensitiva. The results suggest that the explanation for escapes may lie in the management practices adopted by farmers, which are focused on the control of weedy grasses. Escapes are also associated with problems such as the lack of irrigation uniformity and out-of-stage, late herbicide applications.

Weedy Rice Diversity in Southern Brazil

Weed Science ◽  
2021 ◽  
pp. 1-37
Author(s):  
Leonard Bonilla Piveta ◽  
José Alberto Noldin ◽  
Nilda Roma-Burgos ◽  
Vívian Ebeling Viana ◽  
Lariza Benedetti ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Flowering Time ◽  
Weed Management ◽  
Phenotypic Diversity ◽  
Weedy Rice ◽  
Phenotypic Traits ◽  
Southern Brazil ◽  
Variable Response ◽  
Cultivated Rice ◽  
Flowering Synchrony

Abstract Weedy rice (Oryza sativa L.) is one of the most troublesome weeds affecting rice (Oryza sativa L.) production in many countries. Weedy rice control is difficult in rice fields because the weed and crop are phenotypically and morphologically similar. Weedy rice can be a source of genetic diversity to cultivated rice. Thus, this study aimed to characterize the morphological diversity of weedy rice in Southern Brazil. Qualitative and quantitative traits of 249 accessions from eight rice growing mesoregions in Rio Grande do Sul (RS) and Santa Catarina (SC) states were analyzed. For each accession, 24 morphological descriptors (14 qualitative and 10 quantitative) were evaluated. All the 249 accessions from RS and SC are of indica lineage. Considering all the phenotypic traits evaluated, the accessions separated into 14 distinct groups. One of the largest groups consisted of plants that were predominantly tall and with green leaves, intermediate shattering, and variable in flowering time. Distinct subgroups exist within larger clusters, showing discernable phenotypic diversity within the main clusters. The variability in flowering time was high (77 to 110 d after emergence), indicating high potential for flowering synchrony with rice cultivars and, consequently, gene flow. This indicates the need to remove escapes when planting herbicide-resistant rice. Thus, weedy rice populations in Southern Brazil are highly diverse and this diversity could result in variable response to weed management.

Improved soil fertility and weed management is profitable for irrigated rice farmers in Sahelian West Africa

2000 ◽  
Vol 66 (2) ◽  
pp. 101-113 ◽  
Author(s):  
S.M Haefele ◽  
D.E Johnson ◽  
S Diallo ◽  
M.C.S Wopereis ◽  
I Janin
Keyword(s):  
West Africa ◽  
Soil Fertility ◽  
Weed Management ◽  
Irrigated Rice ◽  
Rice Farmers

Genetic Progress in 45 Years of Irrigated Rice Breeding in Southern Brazil

Crop Science ◽  
2018 ◽  
Vol 58 (3) ◽  
pp. 1094-1105 ◽  
Author(s):  
Eduardo Anibele Streck ◽  
Ariano Martins de Magalhaes ◽  
Gabriel Almeida Aguiar ◽  
Paulo Karling Henrique Facchinello ◽  
Paulo Ricardo Reis Fagundes ◽  
...  
Keyword(s):  
Rice Breeding ◽  
Southern Brazil ◽  
Genetic Progress ◽  
Irrigated Rice

Influence of Blast on the Nutrition and Yield of Irrigated Rice in Southern Brazil

2020 ◽  
Vol 20 (3) ◽  
pp. 1378-1386 ◽  
Author(s):  
Claudio Ogoshi ◽  
Filipe Selau Carlos ◽  
Daniel Waldow ◽  
Fernando Fumagali Miranda ◽  
Júlia Lima Reginato ◽  
...  
Keyword(s):  
Southern Brazil ◽  
Irrigated Rice

Timing of weed management and yield losses due to weeds in irrigated rice in the Sahel

2004 ◽  
Vol 85 (1) ◽  
pp. 31-42 ◽  
Author(s):  
D.E Johnson ◽  
M.C.S Wopereis ◽  
D Mbodj ◽  
S Diallo ◽  
S Powers ◽  
...  
Keyword(s):  
Weed Management ◽  
Yield Losses ◽  
Irrigated Rice

Comparison of Weed Management Programs for Furrow-Irrigated and Flooded Hybrid Rice Production in Arkansas

2011 ◽  
Vol 25 (4) ◽  
pp. 556-562 ◽  
Author(s):  
Muthukumar V. Bagavathiannan ◽  
Jason K. Norsworthy ◽  
Robert C. Scott
Keyword(s):  
Weed Control ◽  
Weed Management ◽  
Field Experiments ◽  
Rice Production ◽  
Production Costs ◽  
Yield Reduction ◽  
Rice Grain ◽  
Irrigated Rice ◽  
Grain Yields ◽  
Herbicide Programs

Whether season-long weed control can be achieved in a furrow-irrigated rice system with similar herbicide inputs to that of a flooded system is not known. Field experiments were conducted in 2007 and 2008 at Pine Tree, AR to evaluate different herbicide programs on the weed control efficacy and rice grain yield in furrow-irrigated and flooded rice production systems. Six herbicide programs were evaluated with and without additional late-season “as-needed” herbicide treatments. Minor injury to rice was noted for quinclorac plus propanil. However, the injury was transient and the plants fully recovered. Overall weed control was greater in the flooded system compared with the furrow-irrigated system (up to 20% greater), because flooding effectively prevented the emergence of most terrestrial weeds. In addition, rice grain yields were 13 to 14% greater in flooded compared with furrow-irrigated plots. Irrespective of the irrigation system, herbicide programs that contained a PRE-applied herbicide provided greater weed control and resulted in greater yield compared with those that did not contain PRE-applied herbicide, indicative of the importance of early-season weed control in achieving higher grain yields. On the basis of weed control, yield, and weed treatment cost, the herbicide program with clomazone PRE followed by propanil at four- to five-leaf rice was more efficient than other programs evaluated in both irrigation systems. However, furrow-irrigated plots required as-needed herbicide applications, which were applied after the four- to five-leaf rice stage when two or more plots within a program exhibited ≤ 80% control for any of the weed species. This suggests that furrow-irrigated rice production demands additional weed management efforts and thereby increases production costs. There is also a possibility for substantial yield reduction in the furrow-irrigated system compared with the flooded system. Nevertheless, furrow-irrigated rice production can still be a viable option under water-limiting situations and under certain topographic conditions.

scholarly journals Resistance of Echinochloa crusgalli var. mitis to Imazapyr+Imazapic Herbicide and Alternative Control in Irrigated Rice

2018 ◽  
Vol 36 (0) ◽  
Author(s):  
J.F.L. BONOW ◽  
F.P. LAMEGO ◽  
A. ANDRES ◽  
L.A. AVILA ◽  
G.M. TELÓ ◽  
...  
Keyword(s):  
Weed Management ◽  
Integrated Management ◽  
Rio Grande ◽  
Integrated Weed Management ◽  
Rio Grande Do Sul ◽  
Resistance Level ◽  
Irrigated Rice ◽  
Plant Seeds ◽  
Als Inhibitors ◽  
Continuous Use

ABSTRACT: The introduction of Clearfield® system for irrigated rice production provided an effective management strategy in the selective control of weeds. However, the selection pressure caused by the continuous use of herbicides such as imazapyr+imazapic belonging to the imidazolinone chemical group, without the proper integrated management of weeds, has favored the selection of resistant accessions. The goals of this work were to confirm the resistance to ALS inhibitors in accessions of E. crusgalli var. mitis collected in rice fields of the state of Rio Grande do Sul and to evaluate the control with alternative herbicides registered for weed control. Three experiments were conducted in a greenhouse using plant seeds that survived the application of the herbicide imazapyr+imazapic, collected in irrigated rice producing regions with suspected resistance escapes. For dose-response curve study, three resistant accessions (ECH1 - Pelotas/Rio Grande do Sul, ECH27 - Arroio Grande/Rio Grande do Sul and ECH38 - Rio Grande/Rio Grande do Sul) and two susceptible accessions (ECH14 - Pelotas/Rio Grande do Sul and ECH44 - Rio Grande / Rio Grande do Sul) (factor A) and 11 doses of the herbicide imazapyr+imazapic (factor B) were selected. The results indicate that barnyardgrass resistant accessions present a high resistance level to imazapyr+imazapic. ALS inhibiting herbicides such as imazethapyr+imazapic, bispyribac-sodium and penoxsulam did not control the resistant accessions either. Integrated weed management should be adopted and alternative mechanisms of action as ACCAse (cyhalofop-butyl, profoxydim and clethodim) and EPSPS (glyphosate) inhibitors are still eficients controlling barnyardgrass ALS resistant accessions.

scholarly journals Quantitative and qualitative damages of Oebalus poecilus on irrigated rice in southern Brazil

Revista CERES ◽  
2020 ◽  
Vol 67 (2) ◽  
pp. 126-132
Author(s):  
Nelson Cristiano Weber ◽  
Luiza Rodrigues Redaelli ◽  
Eloá Matos dos Santos ◽  
Fernando Mateus Werner
Keyword(s):  
Southern Brazil ◽  
Irrigated Rice
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