The best replacement for atrazine is simazine.

The best alternatives to atrazine are rated as following:
★★★★★  simazine
★★★  2 4 d
★★  trimec
★  penoxsulam

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Speaking about atrazine, one probably shouldn't forget about st augustine.

Other search terms related to atrazine and their ratings are:
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Google Trends

Scale is based on the average worldwide traffic of atrazine in all years. Click on graph for more.
atrazine
simazine
2 4 d