Results 161 to 170 of about 3,231 (199)
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Saflufenacil efficacy on horseweed and its interaction with glyphosate
Weed Biology and Management, 2013Saflufenacil is a new herbicide on the market and its effectiveness on horseweed, several populations of which have evolved resistance to glyphosate, is not clear. In this research, the effect of adjuvants on the control of horseweed with saflufenacil in the field, the effect of the interaction between glyphosate and saflufenacil on glyphosate ...
Vijay K Nandula, Krishna N Reddy
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Horseweed Response to Rice Herbicides
Crop Management, 2009Rice acreage impacted by horseweed has increased in Mississippi in recent years. Rice producers have few options for managing horseweed that survives a burndown herbicide application or emerges between burndown and planting. Field research was conducted over 2 years to determine the efficacy of postemergence rice herbicides against horseweed.
Jason A. Bond +2 more
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Atmospheric pollen dispersion from herbicide-resistant horseweed (Conyza canadensis L.)
Aerobiologia, 2017Horseweed (Conyza canadensis (L.) Cronq.) with evolved herbicide resistance has become an especially problematic weed in crop production across the USA and on four continents (North America, South America, Asia, and Europe). Spread of herbicide resistance can occur through pollen-mediated gene flow between resistant and susceptible horseweed ...
Junming Wang +2 more
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Biotic and abiotic factors influence horseweed emergence
Weed Science, 2006Abstract Factors affecting horseweed emergence are important for management of this weed species, particularly because of the presence of herbicide-resistant biotypes. Horseweed emergence was highly variable and not strongly correlated to soil temperature (r2 = 0.21), air temperature (r2 = 0.45) or rainfall (r2 = 0.32).
Christopher L. Main +3 more
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Factors affecting germination of horseweed (Conyza canadensis)
Weed Science, 2006The influence of environmental factors on germination and emergence of horseweed was examined in growth chamber experiments. Germination was highest (61%) under 24/20 C day/night temperature under light. Horseweed seed germination was observed under both light (13 h photoperiod) and complete darkness (24 h), but germination under continuous darkness ...
Vijay K. Nandula +4 more
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Controlled experiments to predict horseweed (Conyza canadensis) dispersal distances
Weed Science, 2006Abstract Controlled-environment experiments were conducted to predict the dispersal distance of horseweed seed. Seed were released from a fixed height and collected at three distances from the introduction point along a 6-m wind tunnel. Dispersal potential was assessed at wind speeds of 8 and 16 km hr−1 and release heights of 50.8 and 76.2 cm.
Joseph T. Dauer +2 more
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Occurrence of Glyphosate-Resistant Horseweed (Conyza canadensis) Population in China
Agricultural Sciences in China, 2011Horseweed (Conyza canadensis), an invasive alien weed, is one of the main weeds in orchards in China. Although glyphosate has been used for control of horseweed and many other weeds in orchards for more than 25 years in China, a case of glyphosate-resistant horseweed has not been identified in orchard in China so far despite glyphosate-resistant ...
Sheng Qiang
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Influence of Tillage on Horseweed,Conyza canadensis
Weed Technology, 1988Conservation tillage systems for cotton production were monitored for their influence on horseweed populations. Without fall tillage, horseweed became established and was present the following spring. Disking in the fall or spring controlled horseweed for the subsequent cotton crop.
Steven M. Brown, Ted Whitwell
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Glyphosate-resistant horseweed from Delaware
Weed Science, 2001Abstract No-tillage corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] production has been widely accepted in the mid-Atlantic region, favoring establishment of horseweed [Conyza canadensis (L.) Cronq.]. Within 3 yr of using only glyphosate for weed control in continuous glyphosate-resistant soybeans, glyphosate failed to control horseweed in some
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