Waterhemp is spreading

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Waterhemp plants that can’t be killed by glyphosate (Roundup) are spreading fast, creating another weed headache for farmers.

They were in Essex, Lambton, Chatham-Kent and Middlesex, but the most recent report released recently said the plants have spread to Huron, Wentworth and Haldimand.

Their resistance to glyphosate was discovered by harvesting seeds, planting them in a greenhouse, then spraying them with glyphosate when they had grown to about 10 centimetres.

Other glyphosate-resistant weeds include giant ragweed, common ragweed and Canada fleabane.

“If you have resistant biotypes on your farm, it simply means that your cost of weed management has gone up because additional weed management tactics, in most cases additional herbicides, are going to be required which will add to your cost,” said Peter Sikkema, professor of field weed management at the University of Guelph’s  Ridgetown campus.

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