Resistance of sunflower hybrids to imazamox and tribenuron-methyl

Božić, Dragana; Šarić, M.; Malidža, Goran; Ritz, Christian; Vrbničanin, Sava

doi:10.1016/j.cropro.2012.04.009

Cited by 20 publications

(10 citation statements)

References 33 publications

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“…Namely, in the part of the season when nicosulfuron was applied and responses estimated (between sowing and June 30), the first experimental year was characterized by low precipitation, while precipitation in the second experimental year was relatively high. Therefore, our findings are in accordance with previous investigations demonstrating that environmental conditions significantly affect the activity and effect of foliage-applied herbicides (Kudsk and Kristensen, 1992;Bozic et al, 2012).…”

Section: Discussionsupporting

confidence: 83%

Common Cocklebur (<i>Xanthium strumarium</i>) Response to Nicosulfuron

Božić

Barać

SARIC-KRSMANOVIC

et al. 2015

Not Bot Hort Agrobot Cluj

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The response of two populations (CC1, 43. 59°N & 20.40°E; CC2, 44.46°N & 20.17°E) of common cocklebur (Xanthium strumarium L.) to nicosulfuron was investigated both in field experiments and in the laboratory. Population CC1 had no history of treatment with any herbicide, while population CC2 was treated with ALS inhibitor herbicides for six consecutive years. In the field, plants were treated post-emergence with nicosulfuron (0, 10, 20, 40, 60 and 80 g ai ha -1 ) at four true leaves. Visual injury estimation and vegetative parameters (plant height, fresh weight, leaf area) were recorded about month after herbicide application. The acetolactate synthase (ALS) enzyme activity in response to herbicide concentrations of 0, 0.01, 0.1, 1, 10, 100 µM was determined in vitro. GR50 values for vegetative parameters and I50 values for ALS activity were slightly greater for the CC2 than for the CC1 population, but the results confirmed that neither population was susceptible to nicosulfuron. Namely, based on results for fresh weight, the population CC1 was about 3.9 and 2.6-fold more susceptible to nicosulfuron than population CC2 in two consecutive years, but differences were not so prominent for other parameters (plant height, leaf area and ALS activity), ranging from 1.18 to 1.8-fold. The differences between population CC1 and CC2 could be attributed to inter-population variability in susceptibility to nicosulfuron or could be the consequence of repeated application of ALS herbicides to the CC2 population during the six previous years. Future investigations are necessary in order to clarify this dilemma.

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Section: Discussionsupporting

confidence: 83%

Common Cocklebur (<i>Xanthium strumarium</i>) Response to Nicosulfuron

Božić

Barać

SARIC-KRSMANOVIC

et al. 2015

Not Bot Hort Agrobot Cluj

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“…Differences in sensitivity to tested herbicides among tested sunflower cultivars were significant in both assessment terms (Table 3). According to the study of Bozic et al (2012), imidazolinone tolerant hybrid was 9-64-fold more resistant than non-HT hybrid for DBT -days before treatment; DAT -days after treatment vegetative parameters and about 3000-fold for ALS activity, while sulfonylurea tolerant hybrid was 14-56-fold more resistant than non-HT hybrid for vegetative parameters, and about 2600-fold for ALS activity. 2 WAT, F2 generation of sunflower cultivars showed significantly higher sensitivity to herbicide than F1 generation.…”

Section: Resultsmentioning

confidence: 99%

“…Many studies dealt with the response of the new sunflower lines resistant to ALS inhibiting herbicides (Sala et al 2008(Sala et al , 2012. Also a limited number of studies focused on resistant hybrids and their response to ALS inhibiting herbicides (Vrbnicanin et al 2008, Bozic et al 2012). Sensitivity of volunteer sunflower (F2 generation) to ALS inhibiting herbicides used in subsequent crops has not been well recognized, yet.…”

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confidence: 99%

Differences in sensitivity of F1 and F2 generations of herbicide tolerant sunflower volunteers to selected acetolactate synthase inhibiting herbicides

et al. 2014

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The aim of this work is to describe the differences in sensitivity of Clearfield, ExpressSun and non-herbicide tolerant (HT) sunflower cultivars to several acetolactate synthase inhibitor herbicides and to find out the differences in sensitivity in F1 and F2 generations of these cultivars. Non-HT sunflower was very sensitive to most of the tested herbicides, except for nicosulfuron (efficacy 43-75%). F2 generation of non-HT sunflower showed a low level of sensitivity to imazamox (efficacy 10-43%) and to nicosulfuron, tribenuron, thifensulfuron and rimsulfuron under dry conditions (efficacy 43-83%). Sensitivity of Clearfield sunflower (cultivar with tolerance to imidazolinone herbicides) to tested sulfonylurea varied according to used herbicide and weather conditions. The highest efficacy on Clearfield sunflower showed iodosulfuron (97-100%) > florasulam (88-100%) > foramsulfuron (40-98%) > thifensulfuron (12-99%) > rimsulfuron (37-99%) > tribenuron (0-87%) > nicosulfuron (0-78%). ExpressSun sunflower (cultivar with tolerance to tribenuron) was the most tolerant to all tested herbicides. The lowest efficacy on F1 generation showed tribenuron (0%) > imazamox (0-17%) > nicosulfuron (0-43%) > thifensulfuron (0-57%) > rimsulfuron (0-70%) > foramsulfuron (8-75%) > florasulam (75-96%) > iodosulfuron (87-98%). Sensitivity of F2 generation of ExpressSun to tested herbicide was usually higher as compared to F1 generation.

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“…In most cases of weed resistance to ALSinhibiting herbicides, the mechanism of resistance is due to the change in ALS in the site of action of the herbicide, which makes it insensitive (Dal Magro et al, 2010;Yu et al, 2010;Bozic et al, 2012). Changes in the site of action of the herbicide commonly result from mutations in the genes encoding the enzyme (Devine and Shukla, 2000), resulting in reduced affinity of the enzyme with the inhibitors (herbicides), but with no or little loss of enzyme function (Tranel and Wright, 2002).…”

Section: Differencesmentioning

confidence: 99%

Differential susceptibility of biotypes of conyza sumatrensis to Chlorimuron-ethyl herbicide

et al. 2014

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-Horseweed (Conyza spp.) is an annual weed, infesting soybean crops in southern Brazil, with chlorimuron-ethyl being one of the most commonly used herbicides for its control. However, in recent soybean harvests, an unsatisfactory control of this weed using this herbicide was observed, generating suspicion regarding the selection of resistant biotypes. The objective of this study was to evaluate the susceptibility of horseweed biotypes to the herbicide chlorimuron-ethyl. Two experiments were conducted in a greenhouse; in the first one, the biotypes were selected selected, and the second experiment was arranged in a 5 x 5 factorial in a completely randomized design with four replications. The treatments used in the preparation of the dose response curves were doses of the herbicide chlorimuron-ethyl (0.0, 1.56, 3.13, 6.25, 12.5, and 25 g ha -1 ), applied on the five horseweed biotypes at the 3-4 leaf growth stage. The variables evaluated were visual control percentage and shoot dry weight, compared to the control without herbicide application, and plant acetolactate accumulation. It was concluded that there is a differential susceptibility among the biotypes at doses of less than 20 g ha -1 (dose response curves), which indicates low-level resistance. The practical consequences are the indications of chlorimuron-ethyl application at the maximum doses recomended and that the practice of rotating mechanisms of action must be used in the chemical weed management of these areas.Keywords: chemical control, horseweed, low level resistance, ALS. chlorimuron-ethyl (0,0, 1,56, 3,13, 6,25, 12,5 RESUMO -A buva (Conyza spp.) é uma planta daninha anual que infesta lavouras de soja na região

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Resistance of sunflower hybrids to imazamox and tribenuron-methyl

Cited by 20 publications

References 33 publications

Common Cocklebur (<i>Xanthium strumarium</i>) Response to Nicosulfuron

Common Cocklebur (<i>Xanthium strumarium</i>) Response to Nicosulfuron

Differences in sensitivity of F1 and F2 generations of herbicide tolerant sunflower volunteers to selected acetolactate synthase inhibiting herbicides

Differential susceptibility of biotypes of conyza sumatrensis to Chlorimuron-ethyl herbicide

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