Weed Control in Sunflower (Helianthus annuus L.) with Soil-applied Herbicides Affected by a Prolonged and Limited rainfall

The field trials were carried out in the Bitola and Titov Veles regions during two sunflower growing seasons (2018 and 2019) to estimate a weed control in sunflower with the soil‒applied herbicides, influenced by a prolonged and limited rainfall. Polygonum aviculare L., Solanum nigrum L., Chenopodium album L., Amaranthus retroflexus L., Portulaca oleracea L., and Echinochloa crus-galli (L.) P. Beauv. were the most dominant weeds in both regions. The efficacy of PRE-em herbicides varied among the weed species, treatments, periods of efficacy estimation, regions, and years. The overall performances of the PRE-em herbicides were correlated with weather and soil conditions. The inconsistent weather patterns between the two years of the study likely influenced the weed control. All weeds in 2018 in the Bitola region were poorly controlled (<77% and <62%, 28 and 56 days after application, respectively) due to a higher amount of rainfall (57 mm) during the 10 days of the 1st decade after herbicide application. The herbicide efficacy has only produced a marginal control of weeds in 2019 in the Titov Veles region as well (<68% and <59%, 28 and 56 days after application, respectively), due to the drought conditions observed in this region in early spring and in mid-spring. A PREem application followed by a heavy rainfall resulted in a sunflower injury in the Bitola region in 2018, ranging from 9 to 28% across the PRE-em treatments seven days after emergence. The injuries by oxyfluorfen and dimethenamid-P were more serious (24 and 28%, respectively). The sunflower achene yields for each treatment in both regions generally reflected an overall weed control and crop injury.

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Weed Management in Transplanted Bell Pepper (Capsicum annuum) with Pretransplant Tank Mixes of Sulfentrazone, S-metolachlor, and Dimethenamid-p

HortScience ◽

10.21273/hortsci.43.5.1492 ◽

2008 ◽

Vol 43 (5) ◽

pp. 1492-1494 ◽

Cited By ~ 9

Author(s):

Darren E. Robinson ◽

Kristen McNaughton ◽

Nader Soltani

Keyword(s):

Weed Management ◽

Chenopodium Album ◽

Fruit Size ◽

Field Trials ◽

Amaranthus Retroflexus ◽

Ambrosia Artemisiifolia ◽

Bell Pepper ◽

Weed Species ◽

Marketable Yield ◽

Excellent Control

Pepper growers currently have limited access to many effective broadleaf herbicides. Field trials were conducted over a 3-year period in Ontario to study the effect of tank mixtures of sulfentrazone (100 or 200 g·ha−1 a.i.) with either s-metolachlor (1200 or 2400 g·ha−1 a.i.) or dimethenamid-p (750 or 1500 g·ha−1 a.i.) on transplanted bell pepper. Under weed-free conditions, there was no visual injury or reduction in plant height, fruit number, fruit size, or marketable yield of transplanted pepper with pretransplant applications of sulfentrazone applied in tank mixtures with s-metolachlor or dimethenamid-p. The tank mixture of sulfentrazone + s-metolachlor gave greater than 85% control of redroot pigweed (Amaranthus retroflexus) and eastern black nightshade (Solanum ptycanthum), but only 70% to 76% control of velvetleaf (Abutilon theophrasti), common ragweed (Ambrosia artemisiifolia), and common lambsquarters (Chenopodium album). The combination of sulfentrazone + dimethenamid-p provided good to excellent control of all weed species except velvetleaf. Based on this study, sulfentrazone and dimethenamid-p have potential for minor use registration in pepper.

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Selectivity of Propane Flamer as a Means of Weed Control

HortScience ◽

10.21273/hortsci.30.4.820c ◽

1995 ◽

Vol 30 (4) ◽

pp. 820C-820 ◽

Cited By ~ 7

Author(s):

G.D. Leroux ◽

J. Douheret ◽

M. Lanouette ◽

M. Martel

Keyword(s):

Weed Control ◽

Plant Protection ◽

Chenopodium Album ◽

Amaranthus Retroflexus ◽

Threshold Temperature ◽

Growth Stages ◽

Weed Species ◽

Higher Temperature ◽

And Control ◽

Brassica Kaber

With growing public concern about environmental quality, farmers must turn to new plant protection alternatives that minimize the use of agrochemicals. Flaming has been practiced for several years as a means of weed control in noncropped areas (railroad, ditches, etc.), but its selectivity toward crops has yet to be defined. Experiments were conducted in the ICG-Propane laboratory at Laval Univ. to determine the temperature needed to kill weeds and the temperature that corn could tolerate. Four weed species were studied: Amaranthus retroflexus, Brassica kaber, Chenopodium album, and Setaria viridis and each species was tested at three growth stages: 0–2, 4–6, and >8 leaves. Corn tolerance was tested at four growth stages: coleoptile, 0–2, 4–6, >8 leaves. All plants were grown in the green-house and were submitted to different combinations of operation speeds and of propane pressures, giving 10 temperature intensities ranging from 110 to 390C. The response of each species was evaluated by measuring its height and dry biomass 2 weeks after treatment. The threshold temperature for corn was below 200C; above this temperature, significant corn injury occurred at all growth stages tested. The corn growth stages most tolerant to heat were coleoptile and >8 leaves. While the most sensitive was 4–6 leaves. All weeds tested were sensitive to heat at 0–2 leaf stage. Amaranthus retroflexus and Chenopodium album were controlled until six leaves with temperatures that were not harmful to corn. Weeds with more than eight leaves needed higher temperature, and control rarely reached 60%. Flaming could be a selective method of weed control if operated at a temperature of 170C. Selectivity can be increased by creating a growth differential between corn and weeds.

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Effects of tillage and reduced herbicide doses on weed biomass production in winter and spring cereals

Plant Soil and Environment ◽

10.17221/4146-pse ◽

2011 ◽

Vol 49 (No. 9) ◽

pp. 414-421 ◽

Cited By ~ 2

Author(s):

M. Knežević ◽

M. Đurkić ◽

KneževićI ◽

O. Antonić ◽

S. Jelaska

Keyword(s):

Biomass Production ◽

Spring Barley ◽

Chenopodium Album ◽

Ambrosia Artemisiifolia ◽

Weed Species ◽

Weed Biomass ◽

Polygonum Aviculare ◽

Growing Seasons ◽

Spring Cereals ◽

Annual Weeds

The effects of different tillage systems and dose reduction on the efficacy of triasulfuron & chlortoluron mixture in the post-emergence control of annual broad-leaved weeds in winter wheat and spring barley were studied on lessive pseudogley soil in north-eastern Croatiaduring 1997–2000. Total dry biomass production in untreated plots was significantly influenced by tillage and it was lowest in continuous mouldboard ploughing (99 kg/ha), medium and similar in mouldboard ploughing/disk harrowing alternating every second year and in chisel ploughing (218 kg/ha) whereas the biomass was highest in continuous disk harrowing (422 kg/ha). Thereby the proportion of annual broad-leaved weed biomass was 70, 63, and 28%, respectively. Chenopodium album L., Ambrosia artemisiifolia L., Ch. polyspermum L. and Polygonum aviculare L. are the most abundant annual weed species in all tillage treatments. One half and one quarter of the recommended rate decreased the control efficacy of total weed biomass by 12 and 19%, respectively in wheat and by 6 and 15%, respectively in barley compared to the highest dose but they still provided a very good biomass control of main annual weeds (94–96 percentage units). The efficacy of reduced herbicide doses in the control of annual broad-leaved weeds did not vary significantly between tillage treatments and growing seasons. Significant interaction with continuous disk harrowing tillage and one-quarter herbicide dose was detected in the last year of wheat trial when perennial weeds increased their biomass proportion 8 times compared to four years before.

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Mesotrione: A new herbicide for use in maize

Pesticidi ◽

10.2298/pif0304245e ◽

2003 ◽

Vol 18 (4) ◽

pp. 245-256

Author(s):

Ibrahim Elezovic ◽

Milan Stevic ◽

Katarina Jovanovic-Radovanov

Keyword(s):

Foliar Application ◽

Chenopodium Album ◽

Datura Stramonium ◽

Field Trials ◽

Amaranthus Retroflexus ◽

Xanthium Strumarium ◽

Experimental Sample ◽

Weed Species ◽

Polygonum Lapathifolium ◽

Lepidium Draba

In 2000 and 2001 field trials were carried out to evaluate the efficacy of herbicide mesotrione in maize. The experiments were established in Zemun Polje and Smederevska Palanka, according to EPPO/OEPP standard methods. Trade formulation Callisto (a.i. mesotrione 480 g/L) used as a experimental sample in two doses 0.15 L/ha and 0.25 L/ha for pre-em, and 0.15 L/ha adjuvant; 0.25 L/ha + adjuvant and 0.25 L/ha alone for foliar application. The most sensitive weed species were: Adonis aestivalis, Amaranthus retroflexus, Cirsium arvense, Chenopodium album, Chenopodium hibridum Lepidium draba, Brassica nigra, Datura stramonium, Kickia spuria, Polygonum lapathifolium, Sinapis arvensis, Solanum nigrum, Stachys annua i Xanthium strumarium.

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The problems of presence of weeds in the crops begin with seeds

Karantin i zahist roslin ◽

10.36495/2312-0614.2019.3-4.26-28 ◽

2019 ◽

pp. 26-28

Author(s):

O. Ivashchenko ◽

S. Remenyuk

Keyword(s):

Chenopodium Album ◽

Arable Land ◽

Synthesis Method ◽

Steppe Zone ◽

Amaranthus Retroflexus ◽

Forest Steppe ◽

Weed Species ◽

Climatic Zones ◽

Analysis And Synthesis ◽

Solanum Nigrum L

Goal. Determine the level of potential abrasion of arable land in the main soil-climatic zones of the country. Methods. Used methods of analysis and synthesis, method of comparison. Results. The total reserves of different types of weed seeds in the earth’s horizon 0—10 cm in the main soil-climatic zones of the country on average are: Polissya — 49 thousand pieces/m2; in the forest-steppe zone — 57 thousand pieces/m2; in the Steppe area on average — 57 thousand pieces/m2. Accordingly, during the warm period of the year, 1 m2 of arable land area is able to sprout and form stairs of weeds of various types of weeds on average: in the Polissya area — 1887 pieces; in the zone of forest-steppe — 4674 pieces; in the Steppe zone — 2242 pieces. Basically, these types of tetrophytes are annual weed species, for which the main way of reproduction and distribution is the fruits and seeds: millet cock Echinochloa crus-galli (L.) Pal. Beauv.; Loboda white Chenopodium album L., Common curd (curved) Amaranthus retroflexus L., Field mustard Sinapis arvensis L., Black passion black Solanum nigrum L. and others. Conclusions. Reducing the costs of systems for protecting crops from crops from weeds is possible, in the first place, with the reduction of the depot volume of their seeds in the arable layer of soil.

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Efficacy of foramsulfuron + thiencarbazone-methyl towards different development stages of weed species in sugar beet cultivation

Sugar Industry ◽

10.36961/si17567 ◽

2016 ◽

pp. 436-445 ◽

Cited By ~ 5

Author(s):

Moritz Jasper Wendt ◽

Martin Wegener ◽

Erwin Ladewig ◽

Bernward Märländer

Keyword(s):

Control System ◽

Sugar Beet ◽

Weed Control ◽

Comprehensive Evaluation ◽

Chenopodium Album ◽

Weather Conditions ◽

Field Trials ◽

Weed Species ◽

Development Stages ◽

Cotyledon Stage

The currently available weed control system in sugar beet cultivation has low flexibility due to the necessity of applications at the cotyledon stage of the weeds. The aim of the present study was to evaluate a new herbicide providing more flexibility in terms of application time. In 2013 and 2014, efficacy of an ALS-inhibiting herbicide (foramsulfuron + thiencarbazone-methyl) was evaluated in six field trials in Germany. Sugar beet varieties not sensitive to ALS-inhibiting herbicides are currently in the breeding process. The herbicide was tested on five weed species in different development stages (later than cotyledon stage). In the trials, only weeds but no sugar beet were sown. The herbicide was applied with three dosages at five development stages of the weeds. Efficacy towards Brassica napusL. and Galium aparineL. was nearly 100%. Efficacy towards Chenopodium albumL., Matricaria chamomillaL. and Polygonum convolvulusL. was reduced due to unfavorable weather conditions and with decreasing dosages and increasing development stages. Efficacy was lowest in case of Chenopodium album being close to 95% at BBCH 14 and 16 with 0.50L/ha and 1.00L/ha, respectively. It was thus concluded that the herbicide can be applied later than at cotyledon stage. This implies more flexibility of application timing than current herbicides. To develop a comprehensive evaluation of the weed control system, further studies regarding selectivity, duration of efficacy and resistance risks are necessary.

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Effects of application terms of three soil active herbicides on herbicide efficacy and reproductive ability for weeds in maize

Plant Soil and Environment ◽

10.17221/561/2014-pse ◽

2014 ◽

Vol 60 (No. 10) ◽

pp. 452-458 ◽

Cited By ~ 2

Author(s):

J. Andr ◽

V. Hejnák ◽

M. Jursík ◽

V. Fendrychová

Keyword(s):

Seed Production ◽

Yield Loss ◽

Chenopodium Album ◽

Weather Conditions ◽

Field Trials ◽

Amaranthus Retroflexus ◽

Growing Seasons ◽

Reproductive Ability ◽

Average Precipitation ◽

Mercurialis Annua

The aim of this work was to compare herbicide efficacy and reduction of weed reproduction after the application of three frequently used soil residual herbicides during pre-emergent (PRE) and early post-emergent (EPOST) application in maize. Plot field trials were carried out in Central Bohemia during two growing seasons (2010 and 2011). Good efficacy (88%, resp. 83%) was found in isoxaflutole + thiencarbazone (ISF + THC) and terbuthylazin + S-metolachlor (TBA + SMC) on Echinochloa crus-galli, especially in PRE application use. Efficacy on Amaranthus retroflexus was 91% at both tested application periods and there were no significant differences between experimental years. Significant differences in A. retroflexus control were recorded among all tested herbicides (ISF + THC > TBA + SMC > pendimethalin (PEM) + dimethenamid (DMA)). No significant differences between PRE and EPOST were recorded in efficacy on Chenopodium album. Significant differences in efficacy on C. album were recorded among all tested herbicides (ISF + THC > TBA + SMC > PEM + DMA). Mercurialis annua was the most tolerant tested weed, which was significantly better controlled at EPOST herbicide application (73%) compared to PRE application (32%). TBA + SMC showed a significantly higher efficacy on M. annua compared with other tested herbicides. Seed production of all tested weeds was strongly effected by weather conditions, which were significant during 2011, when there was higher than average precipitation during May and June. The most seeds were produced by A. retroflexus > C. album > E. crus-galli > M. annua. ISF + THC best reduced seed production of E. crus-galli, A. retroflexus and C. album, especially when applied at PRE. TBA + SMC best reduced seed production of M. annua. Weed competition on untreated control plots caused yield loss by 90%and 47% in 2011 and 2012, respectively, compared to treatments with the highest yield (ISF + THC).

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Changes in weed infestation of common bean (Phaseolus vulgaris L.) under conditions of strip intercropping and different weed control methods

Acta Agrobotanica ◽

10.5586/aa.2010.045 ◽

2012 ◽

Vol 63 (2) ◽

pp. 171-178 ◽

Cited By ~ 2

Author(s):

Aleksandra Głowacka

Keyword(s):

Common Bean ◽

Weed Control ◽

Chenopodium Album ◽

Floristic Composition ◽

Dry Weight ◽

Amaranthus Retroflexus ◽

Weed Species ◽

Aerial Parts ◽

Weed Infestation ◽

Strip Intercropping

The experiment was conducted in the years 2004-2006 in a private farm in the village of Frankamionka in Zamość district. There were two experimental factors: I. Cultivation methods - sole cropping and strip intercropping; and II. Tending methods - mechanical, mechanical-chemical, and chemical weed control. The subject of the study was weed infestation of the Mela variety of common bean. Beans were sown between 30 April and 5 May. Weed infestation was assessed in the last week before harvesting by determining its floristic composition and the frequency of occurrence of particular weed species, as well as the air-dry weight of weeds. The dominant weed species were Galinsoga parviflora, Echinochloa crus-galli, Chenopodium album, and Amaranthus retroflexus, which comprised 84.7% of the total number of weeds. Strip intercropping markedly reduced the number of weeds per unit area (by 50%), as well as the dry weight of their aerial parts. The most effective method of weed control was the mechanical-chemical method, which resulted in the lowest occurrence of weeds. It also significantly reduced the weight of weeds.

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Effect of Clay, Soil Organic Matter, and Soil pH on Initial and Residual Weed Control with Flumioxazin

Agronomy ◽

10.3390/agronomy11071326 ◽

2021 ◽

Vol 11 (7) ◽

pp. 1326

Author(s):

Calvin F. Glaspie ◽

Eric A. L. Jones ◽

Donald Penner ◽

John A. Pawlak ◽

Wesley J. Everman

Keyword(s):

Organic Matter ◽

Soil Organic Matter ◽

Weed Control ◽

Soil Ph ◽

Organic Matter Content ◽

Amaranthus Retroflexus ◽

Matter Content ◽

Weed Species ◽

Soil Organic Matter Content ◽

Field Soils

Greenhouse studies were conducted to evaluate the effects of soil organic matter content and soil pH on initial and residual weed control with flumioxazin by planting selected weed species in various lab-made and field soils. Initial control was determined by planting weed seeds into various lab-made and field soils treated with flumioxazin (71 g ha−1). Seeds of Echinochloa crus-galli (barnyard grass), Setaria faberi (giant foxtail), Amaranthus retroflexus (redroot pigweed), and Abutilon theophrasti (velvetleaf) were incorporated into the top 1.3 cm of each soil at a density of 100 seeds per pot, respectively. Emerged plants were counted and removed in both treated and non-treated pots two weeks after planting and each following week for six weeks. Flumioxazin control was evaluated by calculating percent emergence of weeds in treated soils compared to the emergence of weeds in non-treated soils. Clay content was not found to affect initial flumioxazin control of any tested weed species. Control of A. theophrasti, E. crus-galli, and S. faberi was reduced as soil organic matter content increased. The control of A. retroflexus was not affected by organic matter. Soil pH below 6 reduced flumioxazin control of A. theophrasti, and S. faberi but did not affect the control of A. retroflexus and E. crus-galli. Flumioxazin residual control was determined by planting selected weed species in various lab-made and field soils 0, 2, 4, 6, and 8 weeks after treatment. Eight weeks after treatment, flumioxazin gave 0% control of A. theophrasti and S. faberi in all soils tested. Control of A. retroflexus and Chenopodium album (common lambsquarters) was 100% for the duration of the experiment, except when soil organic matter content was greater than 3% or the soil pH 7. Eight weeks after treatment, 0% control was only observed for common A. retroflexus and C. album in organic soil (soil organic matter > 80%) or when soil pH was above 7. Control of A. theophrasti and S. faberi decreased as soil organic matter content and soil pH increased. Similar results were observed when comparing lab-made soils to field soils; however, differences in control were observed between lab-made organic matter soils and field organic matter soils. Results indicate that flumioxazin can provide control ranging from 75–100% for two to six weeks on common weed species.

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Effects of glyphosate-based herbicides and their active ingredients on earthworms, water infiltration and glyphosate leaching are influenced by soil properties

Environmental Sciences Europe ◽

10.1186/s12302-021-00492-0 ◽

2021 ◽

Vol 33 (1) ◽

Author(s):

Johann G. Zaller ◽

Maureen Weber ◽

Michael Maderthaner ◽

Edith Gruber ◽

Eszter Takács ◽

...

Keyword(s):

Organic Matter ◽

Soil Properties ◽

Weed Control ◽

Amaranthus Retroflexus ◽

Water Infiltration ◽

Soil Conditions ◽

Soil Functions ◽

Active Ingredients ◽

Hand Weeding ◽

Earthworm Activity

Abstract Background Glyphosate-based herbicides (GBHs) are among the most often used pesticides. The hundreds of GBHs used worldwide consist of the active ingredient (AI) glyphosate in form of different salts, possibly other AIs, and various mostly undisclosed co-formulants. Pesticide risk assessments are commonly performed using single AIs or GBHs at standard soil conditions without vegetation. In a greenhouse experiment, we established a weed population with common amaranth (Amaranthus retroflexus) to examine the effects of three GBHs (Roundup LB Plus, Roundup PowerFlex, Touchdown Quattro) and their corresponding AIs (salts of glyphosate isopropylammonium, potassium, diammonium) on the activity and physiological biomarkers (glutathione S-transferase, GST; acetylcholine esterase, AChE) of an ecologically relevant earthworm species (Lumbricus terrestris). GBHs and AIs were applied at recommended doses; hand weeding served as control. Experiments were established with two soil types differing in organic matter content (SOM; 3.0% vs. 4.1%) and other properties. Results Earthworm activity (casting and movement activity) decreased after application of glyphosate formulations or active ingredients compared to hand weeding. We found no consistent pattern that formulations had either higher or lower effects on earthworm activity than their active ingredients; rather, differences were substance-specific. Earthworm activity was little affected by soil organic matter levels. Biomarkers remained unaffected by weed control types; GST but not AChE was decreased under high SOM. Water infiltration after a simulated heavy rainfall was interactively affected by weed control types and SOM. Leachate amount was higher after application of formulations than active ingredients and was higher under low SOM. Glyphosate concentrations in soil and leachate were strongly affected by application of formulations or active ingredients and varied with SOM (significant weed control type x SOM interaction). Conclusions We found that both commercial formulations and pure active ingredients can influence earthworms with consequences on important soil functions. Glyphosate products showed increased, reduced or similar effects than pure glyphosate on particular soil functions; soil properties can substantially alter this. Especially at lower SOM, heavy rainfalls could lead to more glyphosate leaching into water bodies. A full disclosure of co-formulants would be necessary to further decipher their specific contributions to these inconsistent effects.

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