Sulfonylurea resistance in <i>Lindernia micrantha</i>, an annual paddy weed in Japan

Itoh,; Wang, Hong; Ohba,

doi:10.1046/j.1365-3180.1999.00155.x

Cited by 46 publications

(23 citation statements)

References 7 publications

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“…3. The trend obtained is consistent with recent reports on whole‐plant responses to SU herbicides in Japan (Wang et al 1997; Itoh et al 1998; Itoh et al 1999). Increasing the herbicide rate results in a decrease in shoot and root length.…”

Section: Resultssupporting

confidence: 92%

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Resistance of Rotala indica Koehne var. uliginosa Koehne to sulfonylurea herbicides

Blancaver

Itoh

Usui

2001

Weed Biology and Management

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The present paper aims to quantify the degree of resistance development in Rotala indica Koehne var. uliginosa Koehne to sulfonylurea (SU) herbicides based on whole plant responses. Seeds of resistant (from Omagari City, Akita Prefecture, Japan) and susceptible (from Tsukuba City, Ibaraki Prefecture, Japan) R. indica plants were seeded in 200 cm2 pots. The plants, at the 1.5 leaf stage, were blanket‐applied with different rates of three sulfonylurea herbicides: bensulfuron methyl (BSM), pyrazosulfuron ethyl (PSE) and imazosulfuron (ISN). Of the three herbicides, the weed appears to have developed the highest degree of resistance to BSM. The resistant/susceptible (R/S) values based on mortality, root length and dry weight are consistently highest at 197, 157 and 101, respectively. Responses based on shoot length, however, showed a higher R/S value for PSE. Roots of R. indica are more sensitive to higher rates of SU herbicides than the shoots. Indeed, a high degree of resistance to SU herbicides have evolved in R. indica, for which the recommended field rates are not enough for effective control of the weed.

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Section: Resultssupporting

confidence: 92%

“…Parallel dose‐response curves (i.e. with a common slope) between the resistant and susceptible biotypes were assumed in curve‐fitting, which was also was done in previous studies (Itoh et al 1999; Lee & Owen 2000;Wang et al 2000). The log‐logistic model was fitted to the data by using SAS release 6.12 (SAS Institute Inc., Cary, NC, USA).…”

Section: Methodsmentioning

confidence: 99%

Resistance of Rotala indica Koehne var. uliginosa Koehne to sulfonylurea herbicides

Blancaver

Itoh

Usui

2001

Weed Biology and Management

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“…Similarly, index of resistance (IR) of 65 was determined based on biomass reduction, for Amaranthus quitensis H.B.K. Studying sulfonylurea effects to Lindernia micrantha D., Itoh et al (1999) have found that although this group of herbicides causes decrease in these parameters in both biotypes (R and S), the R biotype produced more dry weight than the S one under all rates of herbicide applied, which makes dry weight a reliable parameter for monitoring sulfonylurea-resistance of the said species. Furthermore, based on dry weight reduction, an IR of 170 was reported in imazethapyr-resistant wild population of H. annuus (Al-Khatib et al, 1998) which is similar to the level of tolerance to imazethapyr found in the present study.…”

Section: Resultsmentioning

confidence: 99%

Tolerance of sunflower (Helianthus annuus L.) to imazethapyr

Vrbničanin

Božić

Malidža

et al. 2008

Helia

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The response of RIMI [imazethapyr-tolerant (T)] sunflower (Helianthus annuus L.) hybrid and the local imazethapyr-sensitive hybrid "Zoltan" (S) was investigated under controlled conditions. Hybrids grown in pots were treated post-emergence with imazethapyr at the two pairs of leaves stage. Visual injury evaluation and vegetative parameters were recorded. ALS (acetolactate synthase) enzyme activity was estimated in vivo 24 h after imazethapyr application. Tolerance level was determined based on the resistance ratio index (ED 50 -herbicide dose causing 50% growth inhibition of T hybrid/ ED 50 of S hybrid). Significant differences were noted between the hybrids in the in vivo ALS activity and vegetative parameters. Indexes of resistance ranged between 5 and 452 for vegetative parameters, whereas the index for ALS activity was 210. The data confirmed the high level of tolerance of the hybrid Rimi as compared with the hybrid Zoltan.

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“…Preliminary investigations have revealed that a pre-emergence application of pendimethalin suppresses weed growth, when supplemented with a postemergence application of bispyribac (Mahajan and Timsina 2010). Simultaneously, different biotypes showing resistance to prevalent herbicides are known to have emerged in the United States (Fischer et al 2000), Malaysia (Watanbe, Ismail, and Ho 1997), Japan (Itoh, Wang, and Ohba 1999), and Korea (Park, Kim, and Oh 1997). In the United States, multiple resistances to several chemical classes of herbicides have occurred in a single weed species commonly found in rice fields in California (Fischer et al 2000).…”

mentioning

confidence: 99%

Optimizing Seed Rate to Suppress Weeds and to Increase Yield in Aerobic Direct-seeded Rice in Northwestern Indo-Gangetic Plains

Mahajan

Gill

Singh

2010

Journal of New Seeds

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Weed infestation is a major constraint to widespread adoption of aerobic, direct-seeded rice (Oryza sativa L.). Higher than optimum initial seeding density for obtaining more panicles/m 2 is often accompanied by reduced panicle size and 1,000-grain weight, and high rate of spikelet sterility. On the other hand, weeds in plots with a lower seeding rate have a better chance to emerge, grow and build up a strong population and thus pose a serious crop-weed competition. Experiments were conducted during kharif (rainy season) 2008 and 2009 to determine the optimum seed rate that can substantially reduce rice-yield loss caused by weed competition under aerobic conditions. A factorial-treatment arrangement was used with factors consisting of five seed rates (15, 30, 60, 120, and 240 kg/ha) and two weed-pressure treatments (weedy-check and weed-free). Weed pressure caused a significant reduction in yield; there was up to 36.2% reduction in yield for weedy check as compared with the weed-free treatment. Seeding rate was inversely correlated to weed interference. The results suggested that higher seed rates caused significant reductions in weed dry matter, whereas higher than optimum seed rate (15-30 kg/ha) caused reduction in yield. Of all the seeding rates used, 15-30 kg/ha had the lowest grain-yield losses caused by weeds. Therefore, it was concluded that optimum seed rate in direct-seeded rice would minimize the effect of weed competition on rice growth and grain yield and thus would reduce herbicide use, promoting 225 226 G. Mahajan et al. integrated-weed management. Further, this proposition improves economy of the farmers who are thinking to shift to hybrid rice, whose seed is very costly. This investigation supports use of hybrid rice cultivars in DSR using a seed rate of 15-30 kg/ha.

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Sulfonylurea resistance in Lindernia micrantha, an annual paddy weed in Japan

Cited by 46 publications

References 7 publications

Resistance of Rotala indica Koehne var. uliginosa Koehne to sulfonylurea herbicides

Resistance of Rotala indica Koehne var. uliginosa Koehne to sulfonylurea herbicides

Tolerance of sunflower (Helianthus annuus L.) to imazethapyr

Optimizing Seed Rate to Suppress Weeds and to Increase Yield in Aerobic Direct-seeded Rice in Northwestern Indo-Gangetic Plains

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