Herbicide-resistant crops, such as glyphosate-resistant (GR) soybean, allow for broad-spectrum, flexible weed control with minimal crop injury; however, the development of GR weeds, horseweed, has forced reliance on alternative herbicides these weeds. While preplant (PP) provide excellent GR-horseweed, there are currently no POST herbicide options within soybean. The objective this study was to evaluate efficacy dicamba GR-horseweed when applied PP, POST, and sequentially in...

Resistance to 2-methyl-4-chloro-phenoxyacetic acid (MCPA) was recently confirmed in a population of green pigweed (Amaranthus powellii) from Dresden, Ontario, Canada, with resistance factor 4.4. synthetic auxin herbicides Amaranthus species has previously been linked non-target site mechanisms low-level factors (<10). Based on this information an investigation into the mechanism MCPA conducted pigweed. No significant differences absorption, translocation, and metabolism 14 C-MCPA existed...

Glyphosate-resistant (GR) giant ragweed has been confirmed in Ontario, Canada. Giant is an extremely competitive weed and lack of control soybean will lead to significant yield losses. Seed companies have developed new herbicide-resistant (HR) crop cultivars hybrids that stack multiple HR traits. The objective this research was evaluate the efficacy glyphosate plus dicamba tank mixes for GR under Ontario environmental conditions dicamba-tolerant (DT) soybean. Three field trials were...

Byker, H. P., Soltani, N., Robinson, D. E., Tardif, F. J., Lawton, M. B. and Sikkema, P. 2013. Occurrence of glyphosate cloransulam resistant Canada fleabane ( Conyza canadensis L. Cronq.) in Ontario. Can. J. Plant Sci. 93: 851–855. is the second documented glyphosate-resistant (GR) weed species Ontario, Canada. In 2010, first eight GR populations were identified Essex County. 2011 2012, an expanded survey was conducted to identify occurrence cloransulam-resistant Seed collected from field...

Byker, H. P., Soltani, N., Robinson, D. E., Tardif, F. J., Lawton, M. B. and Sikkema, P. 2013. Control of glyphosate-resistant Canada fleabane [ Conyza canadensis (L.) Cronq.] with preplant herbicide tankmixes in soybean Glycine max . (L). Merr.]. Can. J. Plant Sci. 93: 659–667. Glyphosate previously provided excellent control fleabane; however, the evolution (GR) Ontario, alternative herbicides must be identified for this weed soybean. The objective study was to identify that provide...

Seeding date and the duration of weed emergence influenced critical weed-free period in carrot. The extended up to 930 growing degree days (GDD), when carrot was seeded late April. In contrast, short lasted 414 444 GDD, mid May biomass less than 650 g m −2 . It is important for growers scout fields weeds until GDD protect yield potential crop earlier planted crops; however, May, emerging after did not reduce yield. A useful strategy reliance on herbicide application would be delay planting May.

Vink, J. P., Soltani, N., Robinson, D. E., Tardif, F. J., Lawton, M. B. and Sikkema, P. H. 2012. Occurrence distribution of glyphosate-resistant giant ragweed ( Ambrosia trifida L.) in southwestern Ontario. Can. Plant Sci. 92: 533–539. Giant is the first confirmed (GR) weed Canada. A survey was conducted to document GR seed collected from 102 sites Essex (70), Chatham-Kent (21), Lambton (10) Waterloo counties (1) during autumn 2009 2010 prior soybean harvest. Plants were grown a growth room,...

The effectiveness of cover crops as an alternative weed control strategy should be assessed the demand for food and fiber grown under sustainable agricultural practices increases. This study effect fall on populations in spring prior to sweet corn planting during growth. experiment was a split-plot design pea cover–cover crop–sweet rotation with crop type main plot factor presence or absence weeds factor. treatments were no (no-cover), oat, cereal rye (rye), oilseed radish (OSR), (OSR+rye)....

Six field trials were conducted over a two-year period (2014, 2015) to determine the level and consistency of glyphosate-resistant (GR) Canada fleabane control with glyphosate plus saflufenacil third tankmix partner. GR interference reduced soybean yield 73% compared weed free control. At 4 8 weeks after application (WAA), provided 99% 88% respectively, at WAA, density by 96% biomass 89%. Glyphosate dicamba improved 100% 97% respectively. amitrole 97%, 300 or 600 g a.i. ha−1 98%, Tank-mixing...

Trials were established in 2003, 2004, and 2005 Ontario to determine the effects of residues mesotrione, atrazine, mesotrione plus atrazine 1 2 yr after application on broccoli, carrot, cucumber, onion, potato. One application, injury was 43, 37, 18, 24, 0% potato, respectively. The addition year before planting increased 55, 53, 30, 42, 3% Plant dry weight yield also decreased by all crops except accentuated reduction onion. There no injury, or reductions any crop planted alone tank mix...

Manufacturers of several POST corn herbicides recommend tank-mixing their with atrazine to improve performance; however, future regulatory changes may place greater restrictions on use and limit its availability growers. Our research objectives were quantify the effects tembotrione compared alone (1) weed control, (2) variability in (3) sweet yield components variability. Field studies conducted for 2 yr each Illinois, Oregon, Washington, Ontario, Canada. Tembotrione at 31 g ha −1 was...

Vink, J. P., Soltani, N., Robinson, D. E., Tardif, F. J., Lawton, M. B. and Sikkema, P. H. 2012. Glyphosate-resistant giant ragweed ( Ambrosia trifida L.) control with preplant herbicides in soybean [ Glycine max (L.) Merr.]. Can. Plant Sci. 92: 913–922. Giant populations southwestern Ontario have evolved resistance to glyphosate. (GR) interference field crops can lead significant yield losses. Eleven trials [five (PP) burndown only six PP plus residual herbicides] were conducted 2010 2011...

Two studies consisting of six field experiments each were conducted at three locations in southwestern Ontario, Canada, 2014 and 2015 to evaluate the possible antagonism when dicamba was added quizalofop-p-ethyl or clethodim for control volunteer glyphosate-resistant (GR) corn. At 4 wk after application (WAA), 24, 30, 36 g ai ha −1 provided 88, 94, 95% GR corn, respectively. The addition 300 600 ae (24 ) reduced activity on corn by 12 20%. WAA, 37.5, 45 85, 91, (30 resulted antagonism,...

Waterhemp is one of the most troublesome weeds in US and spreading into Ontario. In 2014, a waterhemp population was not controlled with glyphosate field Lambton County, ON. This first confirmed glyphosate-resistant (GR) Canada. 2015, seeds were collected from 48 fields (32), Chatham-Kent (2), Essex (14) counties to determine occurrence distribution GR plants grown greenhouse sprayed when 10 cm height. addition (a group 9 herbicide), populations screened for resistance imazethapyr atrazine,...

Abstract The objective of this WSSA Weed Loss Committee report is to provide quantitative data on the potential yield loss in sugar beet due weed interference from major growing areas United States and Canada. Researchers extension specialists who conducted research control Canada provided their regions. Specifically, were requested studies up 10 individual per calendar year over a 15-yr period between 2002 2017. Data collected indicated that if weeds are left uncontrolled under optimal...

Abstract Glyphosate-resistant (GR) and multiple herbicide–resistant (groups 2 9) Canada fleabane have been confirmed in 30 23 counties Ontario, respectively. The widespread incidence of herbicide-resistant highlights the importance developing integrated weed management strategies. One strategy is to suppress using cover crops. Seventeen different crop monocultures or polycultures were seeded after winter wheat harvest late summer determine GR suppression corn grown following growing season....

The objective of this study was to understand the mechanism underlying nitrogen (N) and water competition between jack pine (Pinus banksiana Lamb.) four boreal forest species. Large-leaved aster (Aster macrophyllus L.), Canada blue-joint grass (Calamagrostis canadensis (Michx.) Beauv.), trembling aspen (Populus tremuloides (Michx.), red raspberry (Rubus idaeus L.) were planted at a range densities (0-8 plants/m 2 ) with seedlings. Net photosynthesis (P n ), nitrogen-use efficiency (NUE),...

From 2013 to 2015, a survey was conducted document the distribution of glyphosate-resistant (GR) and multiple-resistant Canada fleabane with resistance glyphosate cloransulam-methyl across Ontario. This shows that GR is present throughout southern Ontario, from Essex county in southwest Glengarry adjacent Quebec border.

The production of bioenergy from plant biomass has the potential to reduce fossil fuel use. number biogas facilities around world risen dramatically, increasing demand for feedstocks. In this study invasive perennial grass Phragmites australis was evaluated as a feedstock in comparison with Miscanthus x giganteus and Panicum virgatum. Results three field sites each species demonstrated that yields P. averaged approximately 1.82 ± 0.9 kg dry matter (DM) m−2, comparable M. giganteus. Yield...

Thirteen field experiments were conducted in Illinois, Indiana, Ohio, and Ontario from 2005 to 2007 determine the effects of simulated glyphosate drift followed by in-crop applications nicosulfuron/rimsulfuron plus dicamba/diflufenzopyr or foramsulfuron bromoxynil atrazine on nontransgenic corn injury, height, stand count, shoot dry weight, yield. Simulated at 100 200 g/ha, resulted 11 61% visual crop injury a 19 45% decrease height. g/ha caused reduction weight 46%, count 28% yield 49 56%....

Pesticide bans in Canada have resulted a requirement for municipal turfgrass managers to use cultural methods of weed control provide safe playing surface athletes. A field study was conducted determine if overseeding provides enough competition decrease populations Kentucky bluegrass athletic turf typically used parks recreation. Perennial ryegrass overseeded at 2, 4, and 8 kg/100 m2 May, July, or September, all permutations these timings nonirrigated irrigated trials the Guelph Turfgrass...

Four field trials were conducted over a 2-yr period at Exeter (2005, 2006), Harrow (2006) and Ridgetown (2006), Ontario to evaluate the tolerance of pinto small red Mexican (SRM) bean POST application bentazon, imazethapyr, or their combination. Bentazon applied once twice (to simulate spray overlap in field) 840 g ai/ha imazethapyr 37.5 g/ha caused minimal injury (6% less) SRM had no adverse effect on plant height, shoot dry weight, seed moisture content, yield. Imazethapyr all single...