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stalk borer late instar MER copy.jpg

Stalk borer moth`

Description

  • Adult: Moth with a wingspan of just over 1" and forewings that are gray or brown with small white spots.
  • Larvae: Brown worms with white stripes down the body and a purple band around the middle of the body.
  • Eggs: Globular, ridged and laid in the creases of rolled or folded leaves. 
     

Timing of damage: VE to V12

Type of damage: Irregular holes in leaves. Larvae tunnel into the stalk, causing wilting and plant death.

Scouting: Check 20 plants in five separate locations, and pay close attention to field borders.

Economic threshold: There is no established threshold, but treatment is often more effective if applied when the larvae are young and before they have migrated.

Crop
Corn
Age
Adult
Color of markings
White
Timing of damage
VE-V2
V3-V6
V7-V10
V11-VT
Insect color
Gray
Brown
Insect markings
Spots
Insect type
Moth
Insect length
1" to 1-1/2"
Type of damage to crop
Leaf feeding
Stalk boring or cutting
Tillering or wilting
Plant death
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