Sulfonylurea-resistant biotypes of Monochoria vaginalis in paddy fields of Akita and Ibaraki Prefectures, eastern Japan.

Koarai, A.; Morita, H.

doi:10.3719/weed.47.20

Cited by 12 publications

(6 citation statements)

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“…In Japan, it often remains in the field, even after one‐shot herbicide applications, which were developed to be effective against annual and perennial paddy weeds. A biotype resistant to sulfonylurea herbicides has been reported (Koarai & Morita 2002). Furthermore, M. vaginalis is one of the most troublesome weeds in rice cultivation without herbicides in Japan.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the suppression ability of rice (Oryza sativa) on Monochoria vaginalis by measuring photosynthetic photon flux density below rice canopy

Koarai

Morita

2003

Weed Biology and Management

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Field experiments involving eight cultivars were conducted in 1998 and 16 cultivars in 1999 to study the ability of rice ( Oryza sativa L.) to suppress Monochoria vaginalis (Burm. f) Kunth through light competition. Dry weights of M. vaginalis shoots in early season culture exceeded those in normal season culture of any rice cultivars. The relative photosynthetic photon flux density (R-PPFD), which was calculated as the ratio of the photosynthetic photon flux density (PPFD) below the rice canopy to that measured above the rice canopy, varied according to rice cultivar. A strong linear correlation was observed between the mean R-PPFD at 29-35 days after transplanting (DAT) ( r 2 = 0.80; p < 0.01 in 1998; r 2 = 0.63, p < 0.001; and r 2 = 0.93, p < 0.001 in 1999), or 36-42 DAT ( r 2 = 0.66, p < 0.05 in 1998; r 2 = 0.72, p < 0.001; and r 2 = 0.97, p < 0.001 in 1999), and the dry weight of M. vaginalis shoots at approximately 60 DAT. Data from the three experiments could be pooled into one regression line because intercepts and regression coefficients were not significantly different. The r 2 values of the combined regression were highest when R-PPFD was expressed as the mean of measurements taken during 14 days (from 29 to 42 DAT; r 2 = 0.81, p < 0.001). The shortest period for measuring mean R-PPFD in order to obtain a meaningful relationship with M. vaginalis shoot dry weight was 7 days (from 29 to 35 DAT; r 2 = 0.78, p < 0.001). For that same period, relationships between M. vaginalis shoot dry weight at 60 DAT and rice tiller number or leaf area index (LAI) at ground level were weak. However, there were negative relationships between M. vaginalis shoot dry weights at 60 DAT and rice LAI measured 20 cm above the ground, plant heights or rice shoot dry weight, but these coefficients of determination were smaller than those calculated by R-PPFD for the same period. Thus, the ability of rice to suppress M. vaginalis can be evaluated more accurately by measuring mean R-PPFD below the rice canopy for 7 days (from 29 to 35 DAT) than by measuring rice LAI, plant height and shoot dry weight.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the suppression ability of rice (Oryza sativa) on Monochoria vaginalis by measuring photosynthetic photon flux density below rice canopy

Koarai

Morita

2003

Weed Biology and Management

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“…f.) Kunth is one of the five most prevalent weeds found in paddy fields in China (Li et al., 2012). Although M. vaginalis seedlings can be managed using Butachlor (a pre‐emergence herbicide in rice), they remain a serious problem, often causing dramatic losses in rice grain yield (Koarai, 2002; Shuman‐Goodier et al., 2021; Yokota et al., 2014). In direct‐seeded rice cultivation, establishment of the crop canopy is delayed due to the reduced growth of direct‐seeded seedlings, which may be one of the main reasons M. vaginalis infestation severely restricts overall crop growth (Kawaguchi et al., 1997; Martin et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

“…In direct‐seeded rice cultivation, establishment of the crop canopy is delayed due to the reduced growth of direct‐seeded seedlings, which may be one of the main reasons M. vaginalis infestation severely restricts overall crop growth (Kawaguchi et al., 1997; Martin et al., 2017). Moreover, the extensive use of herbicides to manage M. vaginalis has contributed to weed resistance, and biotypes of sulfonylurea‐resistant M. vaginalis have been reported in paddy fields in Akita and Ibaraki Prefectures, eastern Japan (Koarai, 2002). Currently, the effects of M. vaginalis on rice yield and economics in paddy fields remain unknown, and effective cultivation under different weed management practices has yet to be reported.…”

Section: Introductionmentioning

confidence: 99%

Effects of Monochoria vaginalis density on yield losses, economic thresholds, and gross returns in paddy rice (Oryza sativa L.)

Zhou

Luo

et al. 2021

Crop Science

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Monochoria vaginalis (Burm. f.) Kunth is an annual weed commonly found in paddy fields. Understanding the effects of M. vaginalis on the yield and economics of paddy rice (Oryza sativa L.) is essential for integrated weed management. Here, a field experiment was conducted over two consecutive years (2017–2018) to determine the effects of different densities of M. vaginalis (0, 1, 4, 8, 12, 16, 20, and 24 plants m–2) on yield losses, economic thresholds, and gross returns in paddy rice. The results showed that a higher density of M. vaginalis exhibited greater inhibitory effects on plant height, tiller number per plant, and adjusted gross returns in both early and late rice. The inhibitory effects on spike number per plant, filled grains per panicle, and 1,000‐kernel weight were also significant, although lesser than those observed on the other yield traits. The economic threshold of M. vaginalis under manual weeding varied from 2.80 to 4.44 plants m–2, whereas the threshold levels under herbicide application ranged between 0.71 and 1.03 plants m–2 in the 2 yr. Averaged across all other factors, the adjusted gross returns decreased by 45.0% with increasing M. vaginalis density from 0 to 24 plants m–2. Taking into account the economic thresholds and gross returns, irrational use of herbicides should be prevented for weed management in paddy fields. This study provides useful data for reducing the use of chemical herbicides, saving the costs of weed management practices, and protecting the environment of farmland ecosystems.

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“…One of the broad leaf weeds that can be controlled by this herbicide is M. vaginalis. It was found to be resistant to the sulfonylurea herbicide in two different paddy fields in Akita and Ibaraki, Japan (Koarai and Morita 2002). In Indonesia, M. vaginalis is still not officially registered as a resistant weed in paddy fields.…”

Section: Introductionmentioning

confidence: 99%

Journal of Plant Protection Research

Kurniadie,

Widianto,

Widayat

et al. 2021

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Several national rice centers in Indonesia have used acetolactate synthase herbicide inhibitors for years, especially in several regions of Lampung and West Java provinces. This practice has led to the failure of the application of bensulfuron-methyl herbicide to control Monochoria vaginalis (Burm. f.) C. Presl. The purposes of this study were to confirm that the failure of herbicide application in several areas of the provinces of Lampung and West Java was caused by weed resistance, and to determine the level of resistance. A resistance test of M. vaginalis was performed using the whole plant pot test method and split plot design with three replications. Monochoria vaginalis which indicated resistance was sampled from several regions, namely Sapto Mulyo, Ramadewa, Sarijaya, and Kalentambo. The susceptible samples of M. vaginalis as a control were taken from Cibodas and Sumberagung. The six levels of doses of herbicide bensulfuron-methyl used were: 0, 80, 160, 320, 640 and 1,280 g • ha -1 . The experimental results show that M. vaginalis from Sapto Mulyo, Rama dewa, Kalentambo and Sarijaya was confirmed to have developed into weeds resistant to bensulfuron-methyl herbicide. Monochoria vaginalis from Saptomulyo, Kalentambo and Sarijaya were included in the high resistance category with a resistance ratio of more than 12, while M. vaginalis from Ramadewa was included in the moderate resistance category with a resistance ratio of 9.39.

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Sulfonylurea-resistant biotypes of Monochoria vaginalis in paddy fields of Akita and Ibaraki Prefectures, eastern Japan.

Cited by 12 publications

References 0 publications

Evaluation of the suppression ability of rice (Oryza sativa) on Monochoria vaginalis by measuring photosynthetic photon flux density below rice canopy

Evaluation of the suppression ability of rice (Oryza sativa) on Monochoria vaginalis by measuring photosynthetic photon flux density below rice canopy

Effects of Monochoria vaginalis density on yield losses, economic thresholds, and gross returns in paddy rice (Oryza sativa L.)

Journal of Plant Protection Research

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