Most of us have marestail across Ohio. And pretty much all of us have resistant marestail, likely resistant to glyphosate and also likely resistant to the ALS herbicides. And if we all switch to Xtend beans then it will likely also soon be resistant to dicamba. Uh-oh, this is starting to sound bad for the future of soybean weed control.
Table 1. The table below shows the number of fields observed in the Ohio Fall Soybean Weed Survey by region, the percent of fields without weeds and weeds observed ranked by appearance.
|Region of Ohio|
Number of fields observed
% of fields without weeds
Appearance by weed; ranked in order
Marestail; grasses; Common lambsquarters; Volunteer corn; and pigweeds
Marestail; Giant ragweed; Common ragweed; and Redroot pigweed
Giant ragweed; Marestail
Marestail; Giant ragweed; Common ragweed; grasses; pigweeds
Giant ragweed; Marestail; Tall waterhemp; Volunteer corn; grasses
Marestail; Giant ragweed; Volunteer corn; common ragweed; pigweeds
I take this information below from an article by Mark Loux, from October 2011 regarding Fall Herbicide Treatments.… Continue readingRead More »