Agriculture experts say Illinois farmers should be on the lookout for weeds that are resistant to the most popular herbicides. A dozen different weed varieties have become resistant to glyphosate, an active ingredient in the mostly commonly used farm and garden herbicides. That includes two species from the pigweed family, which are particularly worrisome to Illinois corn and soybean farmers. The Palmer amaranth and common waterhemp are prolific. Some varieties can grow to be seven feet tall and produce 1 million seeds. The Palmer amaranth has been documented in Grundy County and can lead to huge corn and soybean losses.
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