scholarly journals Weeds in Organic Bean Crops (Phaseolus vulgaris L.) (Fabaceae Lindl., Fabales)

2020 ◽  
Vol 69 (3-4) ◽  
pp. 110-118
Author(s):  
Dejana Džigurski ◽  
Branka Ljevnaić-Mašić ◽  
Ljiljana Nikolić
Keyword(s):  
Invasive Species ◽  
Phaseolus Vulgaris ◽  
Humus Content ◽  
Climatic Conditions ◽  
Amaranthus Retroflexus ◽  
Ambrosia Artemisiifolia ◽  
Weed Species ◽  
Invasive Weed ◽  
Weakly Alkaline ◽  
Weed Flora

SummaryIn the organic bean crops (Phaseolus vulgaris) grown in open cultivation during the vegetation period of 2012, 14 weed species were found in the villages Ljutovo and Orom. The percentage of invasive species was 28.57%. Ambrosia artemisiifolia was characterized as highly invasive, Sorghum halepense as sporadically invasive, and Amaranthus retroflexus and Datura stramonium as potentially invasive species. Low diversity and low density of weed flora in organic bean crops are the factors causing a high percentage of invasive species in the floristic composition, so monitoring of these species is necessary. The weed flora dominated by therophytes (71.43%), the dominance of weed-ruderal plants (64.29%), and the presence of widespread taxa in the bean crops indicate strong anthropogenic influence and instability of the weed flora. The largest number of the weed species bloom from June to August (71.43%). According to the ecological analysis of the weed flora, the studied agroecosystems were characterized as moderately arid (F-2.36), neutral to weakly alkaline (R-3.07), eutrophic-mesotrophic (N-3.71), well-aerated (D-3.64), non-saline (S-, 78.57%) with medium humus content (H-2.86), favorable light (L-3.86) and temperature (T-4.14) regime, and with temperate continental climatic conditions (K-2.93). Correlation analysis showed that invasive weed species began to bloom later and favored well-aerated and warmer habitats compared to other weeds. PCA analysis singled out habitat aeration and salinity as the main factors separating weeds in organic bean crops.

Canopy and Chemistry of Pasture Weeds

Weed Science ◽  
1980 ◽  
Vol 28 (2) ◽  
pp. 139-141 ◽  
Author(s):  
R. J. Carlisle ◽  
V. H. Watson ◽  
A. W. Cole
Keyword(s):  
Crude Protein ◽  
Warm Season ◽  
Leaf Size ◽  
Amaranthus Retroflexus ◽  
Ambrosia Artemisiifolia ◽  
Chemical Characteristics ◽  
Solidago Altissima ◽  
Weed Species ◽  
Total Leaf Area ◽  
Ruminant Animals

Morphological and chemical characteristics of 11 warm season pasture weed species were defined. Goldenrod (Solidago altissima L.) was significantly taller and common ragweed (Ambrosia artemisiifolia L.) had the largest canopy diameter of the 11 species studied. Species ranged from 14 to 134 cm in height with canopy diameters of 25 to 70 cm. No direct correlation was found between individual leaf size and total leaf area. Macro- and micromineral content varied widely among species but all values obtained were considered high enough to meet the requirements of ruminant animals. Redroot pigweed (Amaranthus retroflexus L.) and horsenettle (Solanum carolinense L.) contained potentially toxic levels of nitrate. Five of the 11 species contained sufficient crude protein for ruminants and six of the 11 species were more than 50% digestible. Digestible energy values averaged 1.9 Mcal/kg for the 11 weeds evaluated.

scholarly journals Influence of different methods for breaking seed dormancy of Ambrosia artemisiifolia, Abutilon theophrasti and Xanthium strumarium on emergence in field conditions

2021 ◽  
Vol 30 (1) ◽  
pp. 29-37
Author(s):  
Jovana Krstić ◽  
Goran Malidža ◽  
Miloš Rajković ◽  
Miloš Krstić
Keyword(s):  
Seed Dormancy ◽  
Block Design ◽  
Ambrosia Artemisiifolia ◽  
Abutilon Theophrasti ◽  
Field Conditions ◽  
Practical Significance ◽  
Xanthium Strumarium ◽  
Weed Species ◽  
Invasive Weed ◽  
Breaking Seed Dormancy

Seed dormancy is an important trait that contributes to the survival rate of weeds, helps to avoid the effects of herbicides and protects them against adverse environmental conditions. In order to determine which methods are effective in breaking seed dormancy of invasive weed species (Ambrosia artemisiifolia, Abutilon theophrasti, Xanthium strumarium), an experiment was set up in 2019 in a randomized block design, with three replications in the experimental field of the Institute of Field and Vegetable Crops (Novi Sad). The collected seeds of one population of A. artemisiifolia and A. theophrasti, were cleaned and stored in cold storage at 4°C until testing, while X. strumarium was stored at room temperature. Seed propagation was done in a weed science laboratory, using nine different methods for breaking seed dormancy. The seeds were exposed to different conditions of temperature, light and humidity over a certain period of time (24h or 48h). The dynamics of weed emergence were monitored daily, for a period of 31 days and expressed cumulatively in percentages. Based on the obtained results, the highest percentage of sprouted plants was determined in treatments where the seeds were propagated under light conditions, in water. An appropriate method of propagation can influence the breaking of seed dormancy and emergence in field conditions, which can have practical significance in the research of competitive relations between crops and tested weed species.

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

HortScience ◽  
2008 ◽  
Vol 43 (5) ◽  
pp. 1492-1494 ◽  
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.

scholarly journals A study on the ecology and economic impact of major invasive weed species of coconut homesteads of Nattika, India

2014 ◽  
Vol 1 (1) ◽  
pp. 32-35
Author(s):  
ES Abhilash ◽  
Sheeja P Parayil ◽  
Brijesh Sathian ◽  
AR Raju ◽  
NA Bilal ◽  
...  
Keyword(s):  
Invasive Species ◽  
Weed Management ◽  
Management Strategy ◽  
Alien Invasive Species ◽  
Chromolaena Odorata ◽  
Weed Species ◽  
Invasive Weed ◽  
Mikania Micrantha ◽  
Medium Risk ◽  
Genetic Aberration

Out of the 4 alien invasive species three are of high risk namely Mikania micrantha, Chromolaena odorata and Mimosa diplotricha. Lantana camara is found to be medium risk. The farmers spent a considerable amount of money nearly Rs 4800 per year for one acre land pertaining to mechanical weeding of invasive species. The herbicide is widely used by farmers to control the weeds are capable to cause various health problems including genetic aberration. So an effective and comprehensive weed management strategy have to be developed in the country to combat the threats of IAS in agriculture fields. DOI: http://dx.doi.org/10.3126/apjeesd.v1i1.9509Asia Pacific Journal of Environment Ecology and Sustainable Development 2013; 1: 32-35

Utility of Maintained Weed Infestations Under Field Conditions

Weed Science ◽  
1970 ◽  
Vol 18 (2) ◽  
pp. 206-214 ◽  
Author(s):  
R. P. Upchurch ◽  
F. L. Selman ◽  
H. L. Webster
Keyword(s):  
Chenopodium Album ◽  
Amaranthus Retroflexus ◽  
Ambrosia Artemisiifolia ◽  
Field Conditions ◽  
Moderate Degree ◽  
Weed Species ◽  
Common Ragweed ◽  
Common Lambsquarters ◽  
Dimethyl Urea ◽  
Polygonum Pensylvanicum

Relatively pure stands of eight weed species were maintained under field conditions on a Goldsboro loamy sand at Lewiston, North Carolina, for all or part of a 6-year period. Herbicides evaluated as preemergence surface treatments for these species were 2-sec-butyl-4,6-dinitrophenol (dinoseb), isopropyl m-chlorocarbanilate (chloropropham), 3-(3,4-dichlorophenyl)-1,1-dimethyl-urea (diuron), 2-chloro-4,6-bis(ethylamino)-s-triazine (simazine), and 3-amino-2,5-dichlorobenzoic acid (amiben). S-ethyl dipropylthiocarbamate (EPTC) and a,a,a-trifluro-2,6-dinitro-N,N-dipropyl-p-toluidine (trifluralin) were evaluated as preemergence incorporated treatments. The first four herbicides were evaluated in 1961, 1964, and 1966 while the last three were evaluated in 1962, 1963, and 1965. A series of rates was used for each chemical with three replications. With the exception of diuron which failed to control goosegrass (Eleusine indica (L.) Gaertn.), all of the herbicides provided at least a moderate degree of control of goosegrass, smooth crabgrass (Digitaria ischaemum (Schreb.) Muhl.), and redroot pigweed (Amaranthus retroflexus L.) at the respective typical field use rates. In general, trifluralin and amiben gave the best grass control and dinoseb the poorest. None of the herbicides effectively controlled common cocklebur (Xanthium pensylvanicum Wallr.) or ivyleaf morningglory (Ipomoea hederacea (L.) Jacq.). Trifluralin and EPTC did not control Pennsylvania smartweed (Polygonum pensylvanicum L.), common ragweed (Ambrosia artemisiifolia L.), and common lambsquarters (Chenopodium album L.). Chloropropham was ineffective on common ragweed. Simazine, chloropropham, and amiben controlled Pennsylvania smartweed while diuron, simazine, dinoseb, and amiben were especially effective on common lambsquarters. Distinctive patterns of nematode infestations were observed as a function of weed species.

Physiological Bases of Sugarbeet (Beta vulgaris) Tolerance to Foliar Application of Ethofumesate

Weed Science ◽  
1981 ◽  
Vol 29 (6) ◽  
pp. 648-654 ◽  
Author(s):  
David N. Duncan ◽  
William F. Meggitt ◽  
Donald Penner
Keyword(s):  
Beta Vulgaris ◽  
Foliar Application ◽  
Amaranthus Retroflexus ◽  
Ambrosia Artemisiifolia ◽  
Water Soluble ◽  
Weed Species ◽  
Common Ragweed ◽  
Species Response ◽  
Redroot Pigweed ◽  
Photosynthesis And Respiration

Absorption, translocation, and metabolism of foliar-applied ethofumesate [(±)-2-ethoxy-2,3-dihydro-3,3-dimethyl-5-benzofuranyl methanesulphonate] were studied to explain field observations showing differences in susceptibility among sugarbeet (Beta vulgarisL.), common ragweed (Ambrosia artemisiifoliaL.), redroot pigweed (Amaranthus retroflexusL.), and common lambsquarters (Chenopodium albumL.). In laboratory studies, two- to four-leaf seedlings of the highly susceptible species, redroot pigweed and common lambsquarter, absorbed greater amounts of14C-ethofumesate from foliar application than the moderately susceptible common ragweed and tolerant sugarbeet. Sugarbeet translocated very little14C from treated foliage to untreated plant tissue. All weed species translocated14C-ethofumesate to untreated leaf tissue when14C-ethofumesate was applied to seedlings at the two-leaf stage. Ethofumesate was translocated basipetally to the stem and root of two-leaf redroot pigweed and common lambsquarter seedlings. A high percentage of the14C was found in the water-soluble fraction in sugarbeet seedlings, indicating inactivation. The amount of metabolites recovered in the non-polar fraction depended on the stage of plant growth. Total photosynthesis and respiration in redroot pigweed was inhibited 4 h after foliar application and did not recover after 96 h. Uptake and evolution of CO2were also inhibited in sugarbeet leaves, but they recovered rapidly, depending on age of plant at treatment. The stage of plant development was the key factor determining species response to foliar treatments of ethofumesate in terms of absorption, metabolism, and total photosynthesis and respiration.

scholarly journals Phenotypic plasticity of an invasive weed Ambrosia artemisiifolia L. in agrobiocenoses of the South of Russia

2020 ◽  
Vol 21 ◽  
pp. 00041
Author(s):  
Leonid Esipenko ◽  
Aleksandr Podvarko ◽  
Anatoliy Savva
Keyword(s):  
Phenotypic Plasticity ◽  
Invasive Plant ◽  
Climatic Conditions ◽  
Ambrosia Artemisiifolia ◽  
Invasive Weeds ◽  
Historical Time ◽  
The South ◽  
Discrete Variation ◽  
Invasive Weed ◽  
Krasnodar Krai

Invasive weeds are characterized by high phenotypic plasticity, which allows them to adapt to new climatic conditions due to variable phenotypes that have arisen in the historical time scale under the control of natural selection. Colonization of such plants takes place locally in accessible anthropogenic cenoses. In the South of Russia the most typical invasive plant is Ambrosia artemosiifolia L. We We examined the discrete variation by vegetative feature — shoot length according to 12 genotypes of ragweed in agrocenoses of Krasnodar Krai.

Examination of commercially available bird feed for weed seed contaminants

2020 ◽  
Vol 13 (1) ◽  
pp. 14-22 ◽  
Author(s):  
Eric Oseland ◽  
Mandy Bish ◽  
Christine Spinka ◽  
Kevin Bradley
Keyword(s):  
Chenopodium Album ◽  
Carthamus Tinctorius ◽  
Grain Sorghum ◽  
Amaranthus Retroflexus ◽  
Ambrosia Artemisiifolia ◽  
Amaranthus Palmeri ◽  
Weed Seed ◽  
Weed Species ◽  
Test Analysis ◽  
Proso Millet

AbstractIn 2016 and 2017, 98 separate commercially available bird feed mixes were examined for the presence of weed seed. All weed seed contaminants were counted and identified by species. Amaranthus species were present in 94 of the 98 bags of bird feed. Amaranthus species present in bird feed mixes included waterhemp [Amaranthus tuberculatus (Moq.) Sauer], redroot pigweed (Amaranthus retroflexus L.), Palmer amaranth (Amaranthus palmeri S. Watson), smooth pigweed (Amaranthus hybridus L.), and tumble pigweed (Amaranthus albus L.). Amaranthus palmeri was present in 27 of the 98 mixes. Seed of common ragweed (Ambrosia artemisiifolia L.), kochia [Bassia scoparia (L.) A.J. Scott], grain sorghum [Sorghum bicolor (L.) Moench], wild buckwheat (Fallopia convolvulus L., syn: Polygonum convolvulus), common lambsquarters (Chenopodium album L.), large crabgrass [Digitaria sanguinalis (L.) Scop.], and Setaria species were also present in bird feed mixes. A greenhouse assay to determine Amaranthus species seed germinability and resistance to glyphosate revealed that approximately 19% of Amaranthus seed in bird feed mixes are readily germinable, and five mixes contained A. tuberculatus and A. palmeri seed that were resistant to glyphosate. Results from linear regression and t-test analysis indicate that when proso millet (Panicum miliaceum L.), grain sorghum, and corn (Zea mays L.) were present in feed mixes, Amaranthus seed contamination was increased. The presence of proso millet and grain sorghum also increased contamination of grass weed species, while sunflower (Helianthus annuus L.) increased A. artemisiifolia contamination and safflower (Carthamus tinctorius L.) increased contamination of Bassia scoparia.

Weed flora of South Africa 2: power shifts in the veld

Bothalia ◽  
1983 ◽  
Vol 14 (3/4) ◽  
pp. 961-965 ◽  
Author(s):  
M. J. Wells ◽  
V. M. Engelbregcht ◽  
A. A. Balsinhas ◽  
C. H. Stirton
Keyword(s):  
Invasive Species ◽  
Threatened Species ◽  
Species Level ◽  
Indigenous Species ◽  
Weed Species ◽  
Power Shifts ◽  
Species Numbers ◽  
Weed Flora ◽  
Family Level ◽  
The Impact

This paper, the second in a series analysing data from the National Weed List, concentrates on weedy changes that affect the indigenous flora. The incidence of weediness and of threatened species is used as an indication of success or failure of families under prevailing conditions of disturbance. The resulting power shifts between indigenous families and the impact of exotic weeds on the situation are reviewed. Many power shifts are taking place between indigenous species in the veld. Superficially it seems as though a relatively few invasive species are displacing a larger number of threatened species, but evidence from Natal points to more species increasing than decreasing under conditions of over-utilization. Amongst small families power shifts are almost as prevalent and important as at species level. Seventeen small families have over 20% indigenous weed species. Thirty small families have over 20% threatened species, and 21 small families have had their species numbers bolstered by more than  20% by exotic weeds. A very few large and medium-sized families contain over 50% of our weeds and our threatened species. It is mostly temperate (Cape) families that are under pressure relative to more tropical families. This trend is echoed at sub-family level within the Fabaceae.

Weed seed destruction by arthropods and rodents in low-input soybean agroecosystems

1988 ◽  
Vol 3 (1) ◽  
pp. 19-25 ◽  
Author(s):  
Gerald E. Brust ◽  
Garfield J. House
Keyword(s):  
Conventional Tillage ◽  
Ground Beetles ◽  
Amaranthus Retroflexus ◽  
Ambrosia Artemisiifolia ◽  
Carabid Beetles ◽  
No Tillage ◽  
Weed Seed ◽  
Weed Species ◽  
Crop Species ◽  
Low Input

AbstractWeed seed consumption experiments involving comparison of rates of seed loss by seed feeders were conducted over a five-week period in low-input (no insecticide, low herbicide usage) conventional- and no-tillage soybean agroecosystems. Seeds of four broadleaf weed species (ragweed[Ambrosia artemisiifoliaL.], pigweed[Amaranthus retroflexusL.], sicklepod[Cassia obtusifoliaL.], and jimsonweed[Datura stramoniumL.]) and one grain crop species (wheat[Triticum aestivumL.]) were provided in a free choice design at densities of 10, 25, and 50 seeds/24 cm3. Approximately 2.3 times more seeds overall, and 1.4 times more large seeds as a group were consumed in notillage systems than in conventional-tillage systems. In our experimental low-input, notillage treatments, large ground beetles (Carabidae: Coleoptera) (15–25 mm) and mice preferentially fed on the larger seed species, while small carabids (< 15 mm), ants and crickets, fed almost exclusively on the smaller seed species. Carabid beetles were responsible for more than half of all seeds consumed. Laboratory and field studies indicated that ground beetles selectively consumed specific seed species. In conventional-tillage, ants were one of the dominant consumers of seeds, suggesting different patterns of resource partitioning in each tillage system. We suggest that selective feeding by arthropod seed feeders, in combination with their high number, could affect the species composition and possibly the abundance of weeds in low-input, no-tillage agroecosystems.

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