Field Corn Weeds

Click here for lifecycle and pesticide overview of all field corn weeds.

Click on any weed below to go to that weed on this page.

Barnyardgrass to top

Type of Pest: Weed

Frequency of Occurrence: Yearly

Damage Caused: competition with maize

% Acres Affected: 30%

Pest Life Cycles: seeds

Timing of Control: May - Mid June, Sept. - Mid Oct.

Yield Losses: 20%

Regional Differences:

Cultural Control Practices: Plowing & Fitting, Cultivation

Biological Control Practices: None

Post-Harvest Control Practices:

Other Issues:

Chemical Controls:  See also Fallpanicum, Foxtails, Johnsongrass, Quackgrass, and Yellownutsedge.

Pesticide

% Trt.

Type of Appl.

Typical Rates

Timing

# of Appl.

PHI

REI

Alachor (Lasso)

   Flowable Broadcast 2 -2.25qts/A preemergence      

Burcucumber to top

Type of Pest: Weed

Frequency of Occurrence: Yearly

Damage Caused: competition with maize

% Acres Affected: 5%

Pest Life Cycles: seeds

Timing of Control: May - Mid June, Sept. - Mid Oct.

Yield Losses: 40%

Regional Differences:

Cultural Control Practices: Plowing & Fitting, Cultivation

Biological Control Practices: None

Post-Harvest Control Practices:

Other Issues: Difficulty harvesting when established

Chemical Controls:  See witchgrass, fallpanicum, foxtails, Johnsongrass, and quackgrass

Common ragweed to top

Type of Pest: Weed

Frequency of Occurrence: Yearly

Damage Caused: competition with maize

% Acres Affected: 80%

Pest Life Cycles: seeds

Timing of Control: May - Mid June, Sept. - Mid Oct.

Yield Losses: 40%

Regional Differences:

Cultural Control Practices: Plowing & Fitting, Cultivation

Biological Control Practices: None

Post-Harvest Control Practices:

Other Issues:

Chemical Controls:  See Witchgrass, Fallpanicum, Foxtails, Johnsongrass, and Quackgrass

Crabgrass to top

Type of Pest: Weed

Frequency of Occurrence: Yearly

Damage Caused: competition with maize

% Acres Affected: 40%

Pest Life Cycles: seeds and rootstems

Timing of Control: May - Mid June, Sept. - Mid Oct.

Yield Losses: 20%

Regional Differences:

Cultural Control Practices: Plowing & Fitting, Cultivation

Biological Control Practices: None

Post-Harvest Control Practices:

Other Issues:

Chemical Controls:  See Barnyardgrass.

Fallpanicum to top

Type of Pest: Weed

Frequency of Occurrence: Yearly

Damage Caused: competition with maize

% Acres Affected: 30%

Pest Life Cycles: seeds

Timing of Control: May - Mid June, Sept. - Mid Oct.

Yield Losses: 20%

Regional Differences:

Cultural Control Practices: Plowing & Fitting, Cultivation

Biological Control Practices: None

Post-Harvest Control Practices:

Other Issues:

Chemical Controls:  See also witchgrass, fallpanicum, foxtails, Johnsongrass, and quackgrass

Pesticide

% Trt.

Type of Appl.

Typical Rates

Timing

# of Appl.

PHI

REI

Alachor (Micro-Tech)

   Liquid Broadcast 2 -2.25qts/A preemergence      

Fieldbindweed to top

Type of Pest: Weed

Frequency of Occurrence: Yearly

Damage Caused: competition with maize

% Acres Affected: <5%

Pest Life Cycles: seeds and creeping roots

Timing of Control: May - July, Sept. - Mid Oct.

Yield Losses: <2%

Regional Differences:

Cultural Control Practices: Plowing & Fitting, Cultivation

Biological Control Practices: None

Post-Harvest Control Practices:

Other Issues: Spread By Tilage Activities, Difficulty harvesting when established

Chemical Controls:

Pesticide

% Trt.

Type of Appl.

Typical Rates

Timing

# of Appl.

PHI

REI

Dicamba       (Banvel 2,4,D)

   Soluble Foliar 0.5pts/A postemergence             2-3 seasons      

Foxtails to top

Type of Pest: Weed

Frequency of Occurrence: Yearly

Damage Caused: competition with maize

% Acres Affected: 70%

Pest Life Cycles: seeds

Timing of Control: May - Mid June, Sept. - Mid Oct.

Yield Losses: 40%

Regional Differences:

Cultural Control Practices: Plowing & Fitting, Cultivation

Biological Control Practices: None

Post-Harvest Control Practices:

Other Issues:

Chemical Controls:  See also witchgrass, fallpanicum, foxtails, Johnsongrass, and quackgrass

Pesticide

% Trt.

Type of Appl.

Typical Rates

Timing

# of Appl.

PHI

REI

Atrazine (Atrazine)

   Liquid 1.25qts/A preemergence      

Carbamate (Sutan)

   Emulsion Incorperate 4.75pts/A pre-planting      

Atrazine (Atrazine)

   Liquid Incorperate 1qt/A pre-planting      

Cyanazine (Bladex)

   D Flowable Incorperate 2.25qts/A preemergence      

Atrazine (Atrazine)

   Liquid Incorperate 1qt/A preemergence      

Atrazine (Bicep Lite II)

   Liquid Incorperate 2.4qts/A preemergence      

Atrazine (Bicep Lite II)

   Liquid Broadcast 2.4qts/A preemergence      

Simazine (Princep)

   Liquid Broadcast 1qt/A preemergence      

Pendmethaline (Prowl)

   EmulsionC Incorperate 3.6pts/A preemergence      

Atrazine (Atrazine)

   Liquid Incorperate 1.25qts/A preemergence      

Jimsonweed to top

Type of Pest: Weed

Frequency of Occurrence: Yearly

Damage Caused: competition with maize

% Acres Affected: <1%

Pest Life Cycles: seeds

Timing of Control: May - Mid June, Sept. - Mid Oct.

Yield Losses: <1%

Regional Differences:

Cultural Control Practices: Plowing & Fitting, Cultivation

Biological Control Practices: none

Post-Harvest Control Practices:

Other Issues: Poisonious Plant

Chemical Controls:  See witchgrass, fallpanicum, foxtails, Johnsongrass, and quackgrass

Johnsongrass to top

Type of Pest: Weed

Frequency of Occurrence: Yearly

Damage Caused: competition with maize

% Acres Affected: <1%

Pest Life Cycles: seeds and tubers

Timing of Control: May - July, Sept. - Mid Oct.

Yield Losses: <1%

Regional Differences:

Cultural Control Practices: Plowing & Fitting, Cultivation

Biological Control Practices: None

Post-Harvest Control Practices:

Other Issues:

Chemical Controls:  See also witchgrass, fallpanicum, foxtails, and quackgrass

Pesticide

% Trt.

Type of Appl.

Typical Rates

Timing

# of Appl.

PHI

REI

Bentazon (Laddok)

   Soluble Foliar 2.3pts/A postemergence      

Metolachlor (Dual II)

   Emulsion Incorperate 2 - 2.5pts/A preplanting      

Atrazine (Atrazine)

   Liquid Incorperate 1.67qts/A preplanting      

Carbamate (Sutan)

   Emulsion Incorperate 4.75 - 7.3pts/A preplanting      

Atrazine (Atrazine)

   Liquid Incorperate 1qt/A preplanting      

Lambsquarter to top

Type of Pest: Weed

Frequency of Occurrence: Yearly

Damage Caused: competition with maize

% Acres Affected: 90%

Pest Life Cycles: seeds

Timing of Control: May - Mid June, Sept. - Mid Oct.

Yield Losses: 40%

Regional Differences:

Cultural Control Practices: Plowing & Fitting, Cultivation

Biological Control Practices: None

Post-Harvest Control Practices:

Other Issues:

Chemical Controls:  See witchgrass, fallpanicum, foxtails, Johnsongrass, and quackgrass

Quackgrass to top

Type of Pest: Weed

Frequency of Occurrence: Yearly

Damage Caused: competition with maize

% Acres Affected: 40%

Pest Life Cycles: seeds and rhizomes

Timing of Control: May - July, Sept. - Mid Oct.

Yield Losses: 20%

Regional Differences:

Cultural Control Practices: Plowing & Fitting, Cultivation

Biological Control Practices: None

Post-Harvest Control Practices:

Other Issues:

Chemical Controls:  See also witchgrass, fallpanicum, foxtails, and Johnsongrass

Pesticide

% Trt.

Type of Appl.

Typical Rates

Timing

# of Appl.

PHI

REI

Glyphosate (Roundup Ultra)

   Liquid Foliar 1 - 2qts/A postemergence      

Nicrosulfuron (Accent)

   S Powder Foliar 0.67ozs/A postemergence      

Primisulfuron (Beacon)

   Granule Foliar 0.76ozs/A postemergence      

Red root pigweed to top

Type of Pest: Weed

Frequency of Occurrence: Yearly

Damage Caused: competition with maize

% Acres Affected: 80%

Pest Life Cycles: seeds

Timing of Control: May - Mid June, Sept. - Mid Oct.

Yield Losses: 40%

Regional Differences:

Cultural Control Practices: Plowing & Fitting, Cultivation

Biological Control Practices: None

Post-Harvest Control Practices:

Other Issues:

Chemical Controls:  See witchgrass, fallpanicum, foxtails, Johnsongrass, and quackgrass

Velvetleaf to top

Type of Pest: Weed

Frequency of Occurrence: Yearly

Damage Caused: competition with maize

% Acres Affected: 40%

Pest Life Cycles: seeds

Timing of Control: May - July, Sept. - Mid Oct.

Yield Losses: 40 - 60%

Regional Differences:

Cultural Control Practices: Plowing & Fitting, Cultivation

Biological Control Practices: None

Post-Harvest Control Practices:

Other Issues:

Chemical Controls:

Pesticide

% Trt.

Type of Appl.

Typical Rates

Timing

# of Appl.

PHI

REI

Pendimethaline (Prowl)

   EmulsionC Foliar 3.6pts/A postemergence      

Atrazine (Atrazine)

   Liquid Foliar 1.25qts/A postemergence      

Cyanazine (Bladex)

   D Flowable Foliar 2.2lbs/A postemergence      

Bromoxynil (Buctril)

   EmulsionC Foliar 1 - 1.5pts/A postemergence      

Dicamba (Banvel)

   Soluble Foliar 0.5 - 1pts/A postemergence      

(Sencor)

   D Flowable Foliar 2ozs/A postemergence      

Wild mustard to top

Type of Pest: Weed

Frequency of Occurrence: Yearly

Damage Caused: competition with maize

% Acres Affected: 40%

Pest Life Cycles: seeds

Timing of Control: May - Mid June, Sept. - Mid Oct.

Yield Losses: 10%

Regional Differences:

Cultural Control Practices: Plowing & Fitting, Cultivation

Biological Control Practices: None

Post-Harvest Control Practices:

Other Issues:

Chemical Controls:  See witchgrass, fallpanicum, foxtails, Johnsongrass, and quackgrass

Witchgrass to top

Type of Pest: Weed

Frequency of Occurrence: Yearly

Damage Caused: competition with maize

% Acres Affected: <5%

Pest Life Cycles: seeds

Timing of Control: May - Mid June, Sept. - Mid Oct.

Yield Losses: <2%

Regional Differences:

Cultural Control Practices: Plowing & Fitting, Cultivation

Biological Control Practices: None

Post-Harvest Control Practices:

Other Issues:

Chemical Controls:  See Barnyardgrass.

Yellownutsedge to top

Type of Pest: Weed

Frequency of Occurrence: Yearly

Damage Caused: competition with maize

% Acres Affected: 30%

Pest Life Cycles: seeds and tubers

Timing of Control: May - July, Sept. - Mid Oct.

Yield Losses: 20%

Regional Differences:

Cultural Control Practices: Plowing & Fitting, Cultivation

Biological Control Practices: None

Post-Harvest Control Practices:

Other Issues:

Chemical Controls:  See fallpanicum, foxtails, Johnsongrass, and quackgrass

Last modified: August 07, 2000

This site best viewed on Netscape 4.0 or higher or similar browser.

Send mail to webmaster sarah.kingsley@uvm.edu with questions or comments about this web site.  Questions or comments about site content should be directed to alan.gotlieb@uvm.edu.