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

Bonow, J. F. L.; Lamego, Fabiane Pinto; Andrés, A.; Avila, Luis Antônio de; Teló, Gustavo Mack; Egewarth, K.

doi:10.1590/s0100-83582018360100028

Cited by 9 publications

(12 citation statements)

References 18 publications

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“…Seeds were sown in trays and transplanted to plastics pots, with a volumetric capacity of 0.5 l. Plants with 3 to 4 expanded leaves were sprayed with imazapyr + imazapic (73.5 + 24.5 g a.e. ha -1 ; grams of acid equivalent per hectare), aiming to screen for herbicide resistance (Table 1) (Bonow et al, 2018. The plants that survived the applied dose were cultivated in plastic buckets for one generation in a greenhouse until the production and collection of seeds, avoiding outcrosses by isolating the plants in separate greenhouses. After harvesting the seeds, they were subjected to dormancy (Brasil, 2009).…”

Section: Methodsmentioning

confidence: 99%

“…Fertility was corrected according to recommendations for irrigated rice (Sosbai, 2018). The resistance factor (RF) of the biotypes was determined in a parallel experiment in the 28 days after treatment (DAT) (Bonow et al, 2018), where the dose causing 50% of plant mortality of the resistant biotype (C50) was divided by the dose that causes 50% of mortality to susceptible plants. However, it was not possible to determine RF for ECH38, as it did not reach such control level.…”

Section: Methodsmentioning

confidence: 99%

“…In irrigated rice crops in southern Brazil, imazapyr and imazapic are widely use as herbicides and the lack of herbicide rotation in treated areas has favoured the selection of resistant barnyard grass, which was confirmed in a previous study with E. crusgalli var. mitis biotypes from Pelotas, Rio Grande and Arroio Grande in Rio Grande do Sul state, Brazil (Bonow et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Echinochloa crusgalli var. Mitis metabolism as resistance mechanism to imazapyr and imazapic

2020

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Selection pressure caused by continuous use of imazapyr and imazapic herbicides in rice fields without crop rotation, has selected for resistant biotypes of Echinochloa crusgalli var. mitis. To know the mechanism of resistance involved becomes important in order to define effective management strategies. Therefore, the objective of this work was to verify if enhanced metabolism of herbicide is responsible for imazapyr and imazapic resistance in Echinochloa crusgalli var. mitis biotypes from Rio Grande (ECH38 resistant and ECH44 susceptible), Pelotas (ECH1 resistant and ECH14 susceptible) and Arroio Grande (ECH27 resistant) in the state of Rio Grande do Sul. For this purpose, forty-nine biotypes were collected from the southern region of the state in areas with barnyard grass control difficulties with ALS inhibitor herbicides. The treatments of study consisted of application of malathion (1000 g a.i. ha-1) and piperonyl butoxide (525 g a.i. ha-1), inhibitors of the cytochrome P450 mono-oxygenase enzymes and after 60 minutes, preceding herbicide application (73.5 + 24.5 g a.e. ha-1. Visual control evaluations were taken at 14 and 28 days after treatments (DAT) and shoot dry mass (SDM) determination at 28 DAT. The results indicate that the application of inhibitors does not alter the control response of the ECH38, but shows a significant increase in phytotoxicity in 28 DAT, with values of 78% for the ECH1. The use of Malathion associated with the herbicide provided a reduction in the SDM of 1.34 g.plant-1 in relation to the isolated application of herbicide and for piperonyl butoxide (PBO) of 1.28 g.plant-1 for the resistant biotype from Pelotas. For ECH27, the SDM reduction was lower than the values of 0.87 g.plant-1 for Malathion and 1.04 g.plant-1 for PBO. The resistance mechanism to imazapyr + imazapic herbicide in Pelotas and Arroio Grande biotypes is related to increased metabolism of the herbicide, and it cannot be stated that this mechanism is involved in the resistance of the ECH38 biotype.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Echinochloa crusgalli var. Mitis metabolism as resistance mechanism to imazapyr and imazapic

2020

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“…The seeds of biotypes were collected from February to April 2014 in rice fields where the chemical control was not efficiency. To confirm the herbicide resistance, a screening and a doseresponse curve experiment were performed to determine the dose of the herbicide imazapyr + imazapic required to control 50% of the population (C50) and reduce 50% of the mass production dry grasses (GR50) in susceptible and resistant biotypes (Bonow et al, 2018).…”

Section: Methodsmentioning

confidence: 99%

Fitness of Echinochloa crusgalli var. mitis biotypes susceptible and resistant to imazapyr + imazapic herbicide

et al. 2019

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Article AbstractThe continuous use of herbicides with the same mechanism of action has caused the selection of resistant weed biotype that may present differences in fitness when compared with susceptible biotype. The objective of the present study was to identify and distinguish the fitness of barnyardgrass biotypes resistant and susceptible to imazapyr + imazapic herbicide under controlled and noncompetitive conditions. For that, there were used barnyardgrass biotype susceptible (ECH1 and ECH38) and resistant (ECH14 and ECH44) to ALS inhibitors, collected at Pelotas/RS and Rio Grande/RS cities, respectively, in experiment installed in a greenhouse in a completely randomized experimental design during the months from October to December 2015. The biotype were evaluated during the period of 15 to 120 days after the emergence related to plant height, foliar area, shoot dry matter mass and root dry matter mass. The results showed insignificant differences between the biotypes during the development of the plants. The susceptible biotype ECH44 showed a higher number of panicles per plant and seeds along with the resistant ECH1. There is variability among Echinochloa crusgalli var. mitis biotypes resistant and susceptible to ALS inhibitors, indicating an absence in fitness penalty caused by resistance when cultivated without the selection of pressure (herbicide).

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“…Selective grass control in rice became possible with the introduction of the Clearfield ™ production system, starting in the early-2000s, with cultivars resistant to herbicides in the imidazolinone chemical group (e.g., imazamox, imazethapyr, imazapic, imazapyr) [6]. Nevertheless, grass weeds such as weedy rice, barnyardgrass, and junglerice quickly evolved resistance to these herbicides, reducing grain yield and creating socioeconomic problems [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Recurrent Selection with Low Herbicide Rates and Salt Stress Decrease Sensitivity of Echinochloa colona to Imidazolinone

et al. 2021

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Weeds represent an increasing challenge for crop systems since they have evolved adaptability to adverse environmental conditions, such as salinity stress. Herbicide effectiveness can be altered by the quality of water in which the weed is growing. This research aimed to study the combined effect of salt stress and recurrent selection with a sublethal dose of imidazolinone herbicides in the shifting of the sensitivity of Echinochloa colona (L.) Link (junglerice) to imidazolinone herbicides. This study was divided into two experiments; in experiment I, three recurrent selection cycles were conducted in Pelotas/RS/Brazil with imazapic + imazapyr at 0.125× the field rate; and in experiment II, three recurrent selection cycles were conducted in Fayetteville/AR/USA with imazethapyr, at 0.125× the recommended dose. Salt stress was implemented by irrigation with 120 mM sodium chloride (NaCl) solution. The effective dose for 50% control of the population (ED50) values increased from the field population to the second generation (G2) after recurrent selection with a sublethal dose of imidazolinone combined with salt stress, supporting the hypothesis of reduced susceptibility by the combination of these abiotic factors. Recurrent exposure to a sublethal dose of imazapic + imazapyr or imazethapyr, combined with salt stress, reduced susceptibility of Echinochloa colona (L.) plants to imidazolinone herbicides.

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

Cited by 9 publications

References 18 publications

Echinochloa crusgalli var. Mitis metabolism as resistance mechanism to imazapyr and imazapic

Echinochloa crusgalli var. Mitis metabolism as resistance mechanism to imazapyr and imazapic

Fitness of Echinochloa crusgalli var. mitis biotypes susceptible and resistant to imazapyr + imazapic herbicide

Recurrent Selection with Low Herbicide Rates and Salt Stress Decrease Sensitivity of Echinochloa colona to Imidazolinone

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