You got some real bad advise down below, be careful. No one can advise you without a lot more info. What is 'hay' to you? Broadleaves, grass, or a mix????? Roundup will kill all the green plants - you need to know that, & no one says so. 2,4D & Roundup have NOTHING in common - don't know what game that guy was playing on you, but wow that is truely aweful advise. 2,4D comes in several flavors, and adding 'a surficant' can really really change how potent it is - can easily burn off your grass too. No one is saying that spot spraying will also kill your grass in the spots you spray with Roundup - some of the others will stunt if not outright kill your hay. Some of these chemicals are very good at certain times of the year, others have long withdrawl periods, and some don't do a thing if you spray at the wrong time. I would figure out what your 'hay' actually is, and talk to someone locally - if you have extension where you are, or most any of the chemical suppliers will be able to help you. And actually know what they are talking about! Some truely bad advise down below. Can't tell if you are experienced & just looking for some good product names, or if you are a newbie & have no idea about chemicals at all - but be real careful of this 'advise.' Good luck. --->Paul
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