In Missouri and Illinois, waterhemp has developed resistance to six different groups (modes of action) of herbicides. “Herbicide resistant waterhemp happens because of the genetic diversity, and because farmers do the same thing over and over again,” Stachler said. This leads to genetic diversity with all kinds of variations, such as plant height and color and also the level of herbicide resistance due to the genetic capacity the plant has.” That causes a problem from the standpoint of diversity as every flower on a female plant could hypothetically have a unique male plant that pollinated each of the flowers. “Palmer amaranth and waterhemp are both dioecious plants, meaning they produce separate male plants and separate female plants. Is going to be similar for both,” said Jeff Stachler, Ohio State University Extension educator in Auglaize County. “It is not critical to separately identify the Palmer amaranth from common waterhemp because the management strategy Jeff Stachler, OSU Extension Redroot pigweed has fine hairs on the stem. Palmer amaranth and waterhemp are relatively easy to separate from redroot pigweed when taking a closer look, because both the Palmer amaranth and waterhemp have smooth stems with no hair on them. ![]() Each weed species is a growing problem in Ohio. Source: How to Differentiate Common Waterhemp and Palmer Amaranth Seedlings.Īuthor: Amit Jhala – Extension Weed Management Specialistīy Dusty Sonnenberg, CCA, Ohio Field Leaderįrom a distance, Palmer amaranth, common waterhemp, and redroot pigweed can easily be mistaken for each other, but proper identification is a key to effective management. ![]() Common waterhemp true leaves without singular hair in the leaf tip notch. ![]() The first and/ or second true leaves of Palmer amaranth usually have a small notch (hair) at the leaf tip.
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