Efficacy of Herbicides When Spray Solution Application Is Delayed

Table 1

Visible estimates of broadleaf signalgrass, entireleaf morningglory, and common ragweed control by clethodim, lactofen, and glyphosate 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	Visible control
		Broadleaf signalgrass		Entireleaf morningglory		Common ragweed
		Clethodim		Lactofen		Glyphosate
		Rocky Mount		Rocky Mount		Lewiston-Woodville
		Field 1	Field 2	Field 1	Field 2	Field 1	Field 2
Days	Days	%
0	0	96^a	94^a	90^a	93^a	97^ab	89^c
4	0	93^ab	88^ab	84^a	86^c	96^ab	95^ab
4	4	94^ab	86^b	85^a	88^bc	98^a	99^a
8	0	90^bc	75^c	58^b	93^ab	86^b	88^c
8	8	88^c	79^c	56^b	98^a	93^ab	91^bc

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