Table 2.1-2. Key times for corn insect activity.
| Attacks the seed |
| Seed corn maggot |
Wireworm |
| Seed corn beetle |
White grub |
| Slugs |
|
| Attacks seedlings -- germination to 4-leaf stage (V4) |
| Seed corn maggot |
Sod webworm |
| Seed corn beetle |
Slugs |
| Garden symphylan |
Stalk borer |
| Wireworm |
True armyworm |
| White grub |
Billbugs |
| Black cutworm |
Flea beetles |
| Grape colaspis |
Corn root aphid |
| Attacks 5th leaf (V5) to silking (R1) |
| Wireworm |
European corn borer |
| White grub |
Corn rootworm |
| Black cutworm |
True armyworm |
| Sod webworm |
Fall armyworm |
| Stalk borer |
|
| Attacks from silking (R1) to beginning of grain fill (R2) |
| European corn borer |
Northern corn rootworm |
| Japanese beetle |
Western corn rootworm |
| Corn leaf aphid |
Grasshoppers |
| Attacks from grain fill to maturity |
| European corn borer |
Grasshoppers |
