Vegetable Weed Control Bulletin

2009 Weed Control Guide for Vegetable Crops
MSU Extension Bulletin E-433


Weed Problem	Chemical	Pounds Active Ingredient (AI)/Acre	Amount of Commercial Product/Acre	Remarks and Limitations Items in bold have changed since the printed bulletin.

Emerged weeds before crop emergence	paraquat (GRAMOXONE MAX 3L)	0.63-1.0	1.7-2.7 pt	Apply to dormant rhubarb. Use higher rate for heavier weed infestation. Do not exceed 2 applications per season. Include 1 pt NIS/100 gal. RUP.

Preemergence	mesotrione (CALLISTO 4 L)	0.188	6 fl oz	Apply to soil before rhubarb breaks dormancy in the spring. Application after growth begins will cause crop stunting and bleaching. 21 day PHI.

	pronamide (KERB 50W)	1-2	2-4 lb	Apply in the fall before November 1 to suppress quackgrass and winter annuals. Do not apply to rhubarb the year of planting. 218-day PHI. RUP. SLN label.

	s-metolachlor (DUAL MAGNUM 7.6E)	0.6301.26	.67-1.33 pt	Apply in spring before rhubarb and weeds emerge. Make a second application after harvest. Do not exceed 1.33 pt/acre/year. 62-day PHI.

Postemergence grasses	clethodim (SELECT MAX 0.97E)	0.068-0.12	9-16 fl oz	Include 0.25% NIS/acre in spray mix. Maximum 64 fl oz/acre/year. 30-day PHI.

	sethoxydim (POAST 1.5E)	0.19-0.28	1-1.5 pt	Apply to actively growing grasses. Include 1 qt COC/acre. 15-day PHI.

Perennials	glyphosate (ROUNDUP 4L)	2-3	2-3 qt	Apply to emerged perennials before planting.