Efficacy of Herbicides When Spray Solution Application Is Delayed

Table 5

Percent reduction in fresh weight of common ragweed following glufosinate, glyphosate, and lactofen and percent reduction in fresh weight of broadleaf signalgrass following clethodim 4 weeks after application at the manufacturer’s suggested weed size and 4 and 8 days after this weed size using spray solutions mixed the day of application or 4 or 8 days prior to application^a.

Timing of application after optimum weed size	Timing of solution preparation prior to application	Percent reduction in fresh weight
		Common ragweed			Broadleaf signalgrass
		Glufosinate	Glyphosate	Lactofen	Clethodim
Days	Days	%
0	0	96^a	85^a	93^a	89^a
4	0	98^a	79^a	86^a	86^a
4	4	81^a	85^a	88^a	88^a
8	0	97^a	74^a	88^a	62^b
8	8	100^a	81^a	92^a	73^b

aMeans within a weed species and herbicide column followed by the same letter are not different at 𝑃≤0.05.