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<p>classified/grouped in various ways; for example, according to their activity, the timing of application, method of application, mechanism of their action, and their chemical structures.</p>

<p><big>Selectivity</big></p>
<p>Chemical structure of the herbicide is of primary affecting efficacy. 2,4-D, <a href="page.php?w=mecoprop">mecoprop</a>, and <a href="page.php?w=dicamba">dicamba</a> control many broadleaf weeds but remain ineffective against turf grasses.</p>

<p>Chemical additives influence selectivity. <a href="page.php?w=Surfactant">Surfactant</a>s</p><p>
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