Sweet Corn Insect Update

Posted: August 2, 2012

Sweet Corn Growers… I have seen my corn ear worm trap numbers climb in the past 3 nights, averaging about 12 a night. That suggests a 4 day spray interval.


With the numerous generic insecticides on the market and some relatively new products (GROUP 5 and Group 28). I thought it would be a good time to review what products are different and which brand names are the same.  It is good IPM to rotate modes of action when spraying corn to prevent insect resistance, just like fungicides and herbicides.


Below is a list I put together from the 2012 Vegetable Guide.


Group 3a insecticides have been known to have resistance issues and under high CEW pressure have not performed as they should have.

Group 28 products have been performing well.

As CEW pressure increases consider adding a Group 28 insecticide at early silking for best results.

Sweet Corn


Corn Earworm Insecticides Listed by IRAC Codes


Group 1a (Carbamates)

Lannate LV (methomyl)--0.75 to 1.50 pts/A


Group 1b+3 (Organophosphates + Pyrethroids/Pyrethrins)

Cobalt Advanced (chlorpyrifos+lambda-cyhalothrin)--16.0 to 38.0 fl oz/A


Group 3a (Pyrethroids/Pyrethrins)

Asana XL (esfenvalerate)--5.8 to 9.6 fl oz/A

Baythroid XL (beta-cyfluthrin)--1.6 to 2.8 fl oz/A

Bifenture 2EC, Brigade or Sniper (bifenthrin)--2.1 to 6.4 fl oz/A

Mustang MAX (zeta-cypermethrin)--2.8 to 4.0 fl oz/A

Warrior II (lambda-cyhalothrin)--1.28 to 1.92 fl oz/A 

Lambda-Cy, LambdaT or Silencer ( lambda-cyhalothrin 2.56 to 3.84 fl oz/A

Tombstone 2EC (cyfluthrin)--1.6 to 2.8 fl oz/A 

Permethrin 3.2EC or Perm-UP (permethrin)--4.0 to 8.0 fl oz/A

Hero EC (zeta-cypermethrin+bifenthrin)--4.0 to 10.3 fl oz/A


Group 3a+ 28  (Pyrethroids/Pyrethrins) + (Diamides)

Voliam Xpress (lambda-cyhalothrin+chlorantraniliprole)--6.0 to 9.0 fl oz/A


Group 5 (Spinosyns)

Radiant SC (spinetoram)--3.0 to 6.0 fl oz/ A

Entrust 80W (spinosad)--1.0 to 2.0 oz/A


Group 28 (Diamides)

Coragen 1.67SC (chlorantraniliprole)--3.5 to 5.0 fl oz/A

Belt SC (flubendiamide)--2.0 to 3.0 fl oz/A


Products and rates from the 2012 Commercial Vegetable Production Recommendations


List organized by Andrew Frankenfield, Penn State Extension,



Andrew Frankenfield

Agricultural Educator

Penn State Extension

Montgomery County

1015 Bridge Road, Suite H

Collegeville, PA 19426