Results 131 to 140 of about 738 (163)

Horseweed

2019
Guide to identifying and managing horseweed.
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Factors affecting germination of horseweed (Conyza canadensis)

Weed Science, 2006
The 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, Thomas W. Eubank, Daniel H. Poston, Clifford H. Koger, Krishna N. Reddy   +4 more
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Controlled experiments to predict horseweed (Conyza canadensis) dispersal distances

Weed Science, 2006
Abstract 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, David A. Mortensen, Robert Humston   +2 more
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Role of transporters in paraquat resistance of horseweed Conyza canadensis (L.) Cronq.

Pesticide Biochemistry and Physiology, 2007
Abstract Paraquat (Pq) inducible transporters are presumed to play a role in the resistance mechanism of horseweed and to function by carrying paraquat to a metabolically inactive compartment. The uptake and intracellular localisation of paraquat, the effect of transporter inhibitors on resistance, and paraquat-induced gene expression were studied to
Balázs Jóri, Vilmos Soós, Dóra Szegő, Emil Páldi, Zoltán Szigeti, Ilona Rácz, Demeter Lásztity   +6 more
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Resistance to Triazine Herbicides in Horseweed (Conyza canadensis)

Weed Science, 1984
Insensitivity to atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine] and certain other herbicides was found in plants of horseweed (Conyza canadensis(L.) Crong. ♯4ERICA) collected from vineyards where atrazine had been applied extensively.
Endre Lehoczki, Gábor Laskay, Endre Pölös, József Mikulás   +3 more
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Crop sequence affects horseweed density and productivity in oats

Crop, Forage & Turfgrass Management
Plain Language SummaryDiversified crop rotations can provide many benefits that include greater yield stability, better nutrient cycling, and improved pest management. In a long‐term experiment, we observed weed differences in oat that was the result of whether the previous crop was corn or grain sorghum.
Marty Schmer, Gary Varvel, Steve Swanson, Ben Fann   +3 more
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Horseweed (Conyza canadensis) seed collected in the planetary boundary layer

Weed Science, 2006
Abstract Horseweed is a winter or summer annual plant, native to North America and distributed worldwide in temperate climates. This plant is considered an important agricultural weed because it can reduce agricultural yields by 90% at high densities and becomes problematic under low-tillage agriculture.
Shields, Elson., Dauer, Joseph., VanGessel, Mark., Neumann, Gabor.   +3 more
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Glyphosate-Resistant Horseweed (Conyza canadensis) in Mississippi

Weed Technology, 2004
Survival of horseweed in several glyphosate-tolerant cotton and soybean fields treated with glyphosate at recommended rates preplant and postemergence was observed in Mississippi and Tennessee in 2001 and 2002. Plants originating from seed collected from fields where horseweed escapes occurred in 2002 were grown in the greenhouse to the 5-leaf, 13- to ...
Clifford H. Koger, Daniel H. Poston, Robert M. Hayes, Robert F. Montgomery   +3 more
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Paraquat Resistance of Horseweed (Erigeron canadensis L.) Is Not Caused by Polyamines

Pesticide Biochemistry and Physiology, 2000
Abstract The correlation between polyamine content and paraquat resistance in horseweed ( Erigeron canadensis L.) was investigated. Untreated paraquat-resistant and paraquat/atrazine-coresistant plants contained about two to three times higher amounts of polyamines, especially putrescine, compared to sensitive ones.
Ilona Rácz, Demeter Lásztity, Éva Darkó, Előd Hidvégi, Zoltán Szigeti   +4 more
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Online tool for GR horseweed (Conyza canadensis) gene flow

2013 Kansas City, Missouri, July 21 - July 24, 2013, 2013
Abstract. Horseweed (Conyza canadensis) with evolved glyphosate resistance (GR) has become an especially problematic weed in crop production across the United States. This paper reports on the framework development of an Internet decision tool that can be used by regulatory agencies, industries, farmers, and the public.
null Junming Wang, null Haiyan Huang, null Rongjian Ye, null Yanhui Peng, null Charles Neal Stewart, null David R. Miller, null Ted W. Sammis   +6 more
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