In Ontario there are 21 different weed species that are resistant to one or more herbicide groups. The table below contains all records of herbicide resistant weed species in Ontario tested and confirmed by the University of Guelph since 1981 (as of November, 2017) Below are distribution maps of weed species that are resistant to different herbicide groups in Ontario…
There is some confusion on the approach for managing glyphosate resistant Canada fleabane in soybeans. I provide two scenarios that have been often asked this past winter and their solutions based on the learnings of Dr. Peter Sikkema’s applied research program out of the University of Guelph (Ridgetown campus). Scenario # 1: No-till soybeans with Canada fleabane emerged prior to…
OMAFRA Field Crop Team April 17, 2015 1587 Comments Off on Winchester AgBreakfast Minutes – April 14, 2015Conditions: Moderate temperatures at the end of winter, combined with limited precipitation minimized spring water runoff and soil erosion. Soil is drying slowly, allowing for only limited field activity to date. Alfalfa: Winter survival generally looks excellent. Alfalfa has 1 to 2 inches of new growth at this point and is showing no sign of heaving damage. Tap roots just…
OMAFRA Field Crop Team April 17, 2014 1633 Comments Off on Winchester Ag Breakfast Meeting Notes – April 15, 2014Conditions: More rainfall in region south and east of Ottawa over the April 12th weekend. Fields are generally saturated. Upper Ottawa Valley has drier conditions. Moisture from snow melt got away with very little ponding in most areas. Alfalfa: Winter survival looks good to date. Alfalfa has 2 to 3 inches of new growth at this point with no/minimal heaving…
If you grow soybeans and have had all or either of Canada fleabane, common ragweed and giant ragweed growing in your fields, the use of pre-plant herbicide tank-mixes will be your best chance at achieving good control of these weeds. Management options for these three weeds are either limited or do not provide acceptable control once the soybean crop has…
