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Waterhemp Strikes AgainJuly 01, 2010
Posted by:
Jacob Evans, Regional Sales Agronomist
Today I was talking to a farmer in South Central Illinois who thinks he has the start of glyphosate resistant waterhemp in one of his fields. He stated that 3 weeks ago they sprayed the field the first time with glyphosate. At the time, most of the waterhemp was less than 4 inches in height, and he said they got 65-70 percent kill; however, within two weeks the weeds that did not die were 4 to 6 inches in height and in clumps of about 15 plants in three or four spots in the field. He spot sprayed them again with glyphosate. Most of them did not die so he manually removed them from the field yesterday. The grower said his retailer stated that waterhemp seemed to be harder to control this year, and everyone in the area seems to be having a lot more escapes than normal.
This does not come as much of a shock to me, as we have been expecting this for a while now. But it does enforce the fact that farmers need to start incorporating different chemistries into their weed control strategies before all the waterhemp becomes resistant and glyphosate is no longer a useful tool. LibertyLink® soybeans would be an excellent fit in these situations. Growers faced with potential glyphosate resistant weeds could use a pre-emergent, come back with Ignite and Fusilade or Select for volunteer corn. The results would be better weed control, and higher yields.
