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[1] There are always two concerns when it comes to the 'cides, of which selective herbicides are one. [2] One issue is drift, the other residue. [3] Generally, drift can affect a 500' area. So that's the range in which, for example, the selective weed killer ka 2,4-d can affect plant appearance and growth. [4] Generally, residues don't stay around more than a month at most. The way a product's residue can be told is by the interval between application and re-application, and the interval between application and harvest.

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