CORN (Field): Zea Mays L. (Dekalb 641)  
European corn borer;  Ostrinia nubilalis (Hubner)                     

Jerry Echtenkamp & Tom Hunt
Haskell Agricultural Laboratory
57905 866 Road, Concord, NE 68728
(402)-584-2261

CONTROL OF EUROPEAN CORN BORER IN WHORL STAGE CORN, 2001

  The experimental design was a randomized complete block with nine insecticide treatments and an untreated check replicated four times.  Single row plots were 50 feet in length and at 30 inch spacings.  Corn was no-till planted into soybean residue on 27 Apr.  Liquid insecticides were applied with a back-pack sprayer directing the spray solution into the whorl and calibrated to deliver 20 gallons of water/acre at 30 psi.  The planting time treatment of  Regent 4SC was applied in-furrow via microtubes.   Capture 1.15G & Pounce 1.5G granular insecticide was applied with a shaker can.

On 27 Jun, six black headed ECB egg masses were placed in each whorl of ten marked plants per plot row.  Whorl treatments were applied eight days later on 5 Jul.  On 23 Jul, the infested plants were dissected from tassel to ground, and the number of corn borer cavities recorded.  Results were analyzed using analysis of variance procedures.  Treatment means were separated using LSD procedures

All treatments, except the EXP8080 seed treatment,  resulted in significantly fewer cavities compared with the untreated check.  Number of cavities per plant was greater than 1.0 with EXP8080 seed treatment and Regent 4SC applied in-furrow.


Treatment/form

Rate (lbs ai/acre 
or g/kg seed)    


cavities/plant1 

Regent 4SC

0.060 lbs ai     

0.15 a

Capture 1.15G

0.046 lbs ai     

0.25 a 

Pounce 1.5G   

0.150 lbs ai     

0.35 a

Intrepid 2F2     

0.120 lbs ai     

0.37 a

Warrior T 1E  

0.030 lbs ai     

0.37 a

Warrior-T 1E  

0.025 lbs ai     

0.40 a

Dow XR-225 1.25 SC

0.015 lbs ai     

0.70 a

Regent 4SC     

0.13 lbs ai (inf. at 1GPA)3

1.30 b

EXP8080 seed treatment

100g/100 kg seed

1.67 bc

Untreated        

------------

3.42 c

1--Means followed by the same letter are not significantly different (P>0.05) using LSD.
2--Latron CS-7 at 0.25% v/v additive was included.
3--Applied in-furrow at planting with microtubes.

CONTROL OF SECOND GENERATION EUROPEAN CORN BORER, 2001

Foliar treatments of registered and non-registered insecticides for second generation European corn borer control were applied to irrigated corn plots on 7 Aug.  Liquid formulated insecticides were applied with a Hahn Hi-Boy calibrated to deliver 17 gpa at 30 psi.  Five days prior to application, six black headed egg masses on paper discs were pinned to the middle portion of ten marked corn plants in each replicate.  Experimental design was RCB with four replications.  On 20 Sep, the infested plants were dissected from tassel to ground, and the number of corn borer larvae recorded.  Results were analyzed using analysis of variance procedures.  Treatment means were separated using LSD procedures.

All treatments resulted in significantly fewer larvae per plant than the untreated check.  Results were variable among treatments. 

          


Treatment/form. 

Rate (fluid ounces formulation or lbs ai/acre)  


larvae/plant1  

Capture 2E      

  0.080 lbs ai       

0.18 a

Dow XR-225 0.50 SC

            0.015 lbs ai     

0.45 ab

Warrior-T  1E             

            0.030 lbs ai     

0.73 ab

Capture 2E                  

            0.040 lbs ai     

0.85  bc

Warrior-T  1E             

            0.025 lbs ai     

0.85 bc

Intrepid 2F2                 

            0.120 lbs ai     

1.02 bc

Intrepid 2F2                 

            0.060 lbs ai     

1.05 bc

FO570 0.8 EW           

            0.014 lbs ai     

1.38 c

FO570 0.8 EW           

            0.017 lbs ai     

1.38 c

Untreated                    

            ------                          

3.20 d

1-Means followed by the same letter are not significantly different
(P>0.05) using LSD.
2-Latron CS-7 at 0.25% v/v additive was included.