Overviews of pest lifecycles, chemical control methods, and non-chemical control methods are shown in tabular form below. All contents are draft only. Please send any comments to alan.gotlieb@uvm.edu.

Field Corn Weeds Lifecycle

WEED	V of Occurance	% A Infested	Yield Losses	Damage	Lifecycle	Control Timing
Broadleaf Annual Weeds
Jimsonweed	Yearly	<1	<1	competition with maize	seeds	May - Mid June Sept. - Mid Oct.
lambsquarter	Yearly	90	40	competition with maize	seeds	May - Mid June Sept. - Mid Oct.
redrootpigweed	Yearly	80	40	competition with maize	seeds	May - Mid June Sept. - Mid Oct.
commonragweed	Yearly	80	40	competition with maize	seeds	May - Mid June Sept. - Mid Oct.
wild mustard	Yearly	40	10	competition with maize	seeds	May - Mid June Sept. - Mid Oct.
burcucumber	Yearly	5	40	competition with maize	seeds	May - Mid June Sept. - Mid Oct.
velvetleaf	Yearly	40	40 - 60	competition with maize	seeds	May - July Sept. - Mid Oct.
Annual Grass Weeds
crabgrass	Yearly	40	20	competition with maize	seeds and rootstems	May - Mid June Sept. - Mid Oct.
barnyardgrass	Yearly	30	20	competition with maize	seeds	May - Mid June Sept. - Mid Oct.
witchgrass	Yearly	<5	<2	competition with maize	seeds	May - Mid June Sept. - Mid Oct.
fallpanicum	Yearly	30	20	competition with maize	seeds	May - Mid June Sept. - Mid Oct.
foxtails	Yearly	70	40	competition with maize	seeds	May - Mid June Sept. - Mid Oct.
Broadleaf Perennial Weed
fieldbindweed	Yearly	<5	<2	competition with maize	seeds and creeping roots	May - July Sept. - Mid Oct.
Perennial Grass Weed
yellownutsedge	Yearly	30	20	competition with maize	seeds and tubers	May - July Sept. - Mid Oct.
johnsongrass	Yearly	<1	<1	competition with maize	seeds and tubers	May - July Sept. - Mid Oct.
quackgrass	Yearly	40	20	competition with maize	seeds and rhizomes	May - July Sept. - Mid Oct.

Field Corn Weeds Chemical Control Methods

WEED	Trade Name	Chemical	% A.I.	% Crop Treat	Form	App. Type	App. Rate	App. Time	# Appls.	Days to Harvest
Broadleaf Annual Weeds - See also Perennial Grass Weeds and Annual Grass Weeds.
Jimsonweed	-	-	-	-	-	-	-	-	-	-
lambsquarter	-	-	-	-	-	-	-	-	-	-
redrootpigweed	-	-	-	-	-	-	-	-	-	-
commonragweed	-	-	-	-	-	-	-	-	-	-
wild mustard	-	-	-	-	-	-	-	-	-	-
burcucumber	-	-	-	-	-	-	-	-	-	-
velvetleaf	Prowl +	Pendimethaline	37.4	-	EC	Foliar	3.6pts/A	postemergence	-	-
	Atrazine* +	Atrazine*	43	-	Liquid	Foliar	1.25qts/A	-	-	-
	Bladex*	Cyanazine*	90	-	D Flowable	Foliar	2.2lbs/A	-	-	-
	Buctril	Bromoxynil	33.4	-	EC	Foliar	1 - 1.5pts/A	postemergence	-	-
	Banvel	Dicamba	48.2	-	Soluble	Foliar	0.5 - 1pts/A	postemergence	-	-
	Banvel +	Dicamba	48.2	-	Soluble	Foliar	0.5pts/A	postemergence	-	-
	Sencor	-	75	-	D Flowable	-	2ozs/A	-	-	-
Annual Grass Weeds - See Also Broadleaf Annual Weeds.
crabgrass	-	-	-	-	-	-	-	-	-	-
barnyard	-	-	-	-	-	-	-	-	-	-
witchgrass	Lasso* or	Alachor* or	45.1	-	Flowable	Broadcast	2 -2.25qts/A	preemergence	-	-
fallpanicum	Micro-Tech* +	Alachor*	41.5	-	Liquid	Broadcast	2 -2.25qts/A	preemergence	-	-
foxtails	Atrazine*	Atrazine*	43	-	Liquid	-	1.25qts/A	preemergence	-	-
	Sutan +	Carbamate*	85.1	-	Emulsion	Incorperate	4.75pts/A	pre-planting	-	-
	Atrazine*	Atrazine*	43	-	Liquid	-	1qt/A	-	-	-
	Bladex* +	Cyanazine*	90	-	D Flowable	Incorperate	2.25qts/A	preemergence	-	-
	Atrazine*	Atrazine*	43	-	Liquid	-	1qt/A	-	-	-
	Bicep Lite II*	Atrazine*	53.6	-	Liquid	Incorperate	2.4qts/A	preemergence	-	-
	Bicep Lite II* +	Atrazine*	53.6	-	Liquid	Broadcast	2.4qts/A	preemergence	-	-
	Princep	Simazine	41.9	-	Liquid	-	1qt/A	-	-	-
	Prowl +	Pendmethaline	37.4	-	EC	Incorperate	3.6pts/A	preemergence	-	-
	Atrazine*	Atrazine*	43	-	Liquid	-	1.25qts/A	-	-	-
Broadleaf Perennial Weeds
fieldbindweed	Banvel 2,4,D	Dicamba	48.2	-	Soluble	Foliar	0.5pts/A	postemergence	2-3 seasons
Perennial Grass Weeds - See also Annual Grass Weeds and Broadleaf Annual Weeds.
yellownutsedge	-	-	-	-	-	-	-	-	-	-
johnsongrass	Laddok*	Bentazon*	27	-	Soluble	Foliar	2.3pts/A	postemergence	-	-
	Dual II +	Metolachlor	84.4	-	Emulsion	Incorperate	2 - 2.5pts/A	preplanting	-	-
	Atrazine*	Atrazine*	43	-	Liquid	-	1.67qts/A	-	-	-
	Sutan +	Carbamate	85.1	-	Emulsion	Incorperate	4.75 - 7.3pts/A	preplanting	-	-
	Atrazine*	Atrazine*	43	-	Liquid	-	1qt/A	-	-	-
quackgrass	Roundup Ultra	Glyphosate	41	-	Liquid	Foliar	1 - 2qts/A	postemergence	-	-
	Accent*	Nicrosulfuron	75	-	S Powder	Foliar	0.67ozs/A	postemergence	-	-
	Beacon*	Primisulfuron	75	-	Granule	Foliar	0.76ozs/A	postemergence	-	-

Field Corn Weeds Non-Chemical Control Methods

WEED	Alternatives	Cultural	Biological	Issues
Broadleaf Annual Weeds
Jimsonweed	-	Plowing & Fitting Cultivation	None	Poisonious Plant
lambsquarter	-	Plowing & Fitting Cultivation	None	-
redrootpigweed	-	Plowing & Fitting Cultivation	None	-
commonragweed	-	Plowing & Fitting Cultivation	None	-
wild mustard	-	Plowing & Fitting Cultivation	None	-
burcucumber	-	Plowing & Fitting Cultivation	None	Difficulty Harvesting When Established
velvetleaf	-	Plowing & Fitting Cultivation	None	-
Annual Grass Weeds
crabgrass	-	Plowing & Fitting Cultivation	None	-
barnyardgrass	-	Plowing & Fitting Cultivation	None	-
witchgrass	-	Plowing & Fitting Cultivation	None	-
fallpanicum	-	Plowing & Fitting Cultivation	None	-
foxtails	-	Plowing & Fitting Cultivation	None	-
Broadleaf Perennial Weed
fieldbindweed	-	Plowing & Fitting Cultivation	None	Spread By Tilage Activities. Difficulty Harvesting When Established
Perennial Grass Weed
yellownutsedge	-	Plowing & Fitting Cultivation	None	-
johnsongrass	-	Plowing & Fitting Cultivation	None	-
quackgrass	-	Plowing & Fitting Cultivation	None	-

Last modified: August 04, 2000

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