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Registered: ‎05-19-2010
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need help with Rdp. resistant weeds

We're thinking that we've got a field that has Rdp. resistant waterhemp.  Sprayed a week ago and some are still green and look healthy.  They were 12-16 in. high and we used 32 oz. of Touchdown with speedway as a sticker.  The weather was near perfect all day high in the upper 80's and sunny with a little wind.  Field next to it sprayed with same tank mix got a good kill.  What do you recommend we do if these weeds don't die?  I'm going to say we got less than 33% complete kill in 80 acres.