Adults lay eggs in mid to late summer. The eggs remain in the soil during the winter and hatch the following spring, usually in late May or early June. The larvae or rootworms feed for about 3 to 4 weeks, pupate in the soil, and emerge as adults in July.
Use of a soil insecticide at planting when destructive wireworm populations exist or are anticipated provides the best means of reducing stand loss.
If densities of adult western and/or northern corn rootworm beetles exceeded an average of one per plant at any time from July through August and the field is to be planted to corn the following year, an "at-planting" soil insecticide is advisable.
% active ingredient |
Row width |
|||||
| 30" | 32" | 34" | 36" | 38" | 40" | |
| 1.5 | 8.7 | 8.2 | 7.7 | 7.3 | 6.9 | 6.5 |
| 15 | 8.7 | 8.2 | 7.7 | 7.3 | 6.9 | 6.5 |
| 20 | 6.5 | 6.1 | 5.8 | 5.4 | 5.2 | 4.9 |
| Insecticide | Application | Ounces / 1,000' row |
| Aztec 2.1% G | Band, T-Band, or furrow | 6.7 |
| Aztec 4.67% G | Band, T-Band, or furrow | 3 |
| Capture 1.15% G | T-Band or furrow | 3.2 to 8 oz |
| Counter 15% G | Band or furrow | 8 |
| Counter 20 CR | Band or furrow | 6 |
| Force 3% G | Band, T-Band, or furrow | 4 - 5 |
| Fortress 5% G | T-Band or furrow | 3 |
| Holdem 20% G | Band | 6 |
| Lorsban 15% G | Band or T-Band | 8 |
| Mocap 10% G | Band | 12 |
| Thimet 20% G | Band | 6 |
NOTE:
If you plan to use sulfonylurea herbicides such as ACCENT or BEACON, read the labels of these products carefully
before selecting a soil insecticide, especially the comments regarding COUNTER. Also, learn the precaution
concerning FOLIAR APPLICATIONS of organophosphate insecticides in conjunction with use of these herbicides.
| Insecticide | Application | Rate |
| Capture 2 EC | 5 to 7" T-band over open furrow | 0.3 fl oz/1000' of row |
| Furadan 4 F | 7" band broadcast or injected | 2.5 fl oz/1000' of row |
| Lorsban 4E | Broadcast PPI | 3 qts per acre |
| Mocap 6 EC | 7" band | 1.6 fl oz/1000' of row |
| Regent 4 SC | Microtube injection or infurrow band | 0.24 oz/1000' of row |
NOTE:
Liquid insecticides must be compatible with liquid
fertilizer if applied as tank mixes. Mocap is labeled only as a spray with water. Follow label precautions carefully.
Follow all recommended precautions when using these products. Liquid formulations are
MORE TOXIC than similar granular formulations. Do not plant small grains or other rotational crops within 12 months
following a Regent application. NOTE: Thimet may cause injury if placed in contact with the seed.
A cultivation application may be made if no soil insecticide was applied at planting. Any of the granular insecticides listed above may be used at the indicated rates. Furadan 4F at the rate above or Lorsban 4E at 2 pts per acre may be used as basal sprays. These treatments should be applied no later than the last half of May. Moisture following any cultivation is necessary for activation. Treatments will be slow to work or ineffective under very dry conditions. Cultivation treatments should be regarded as delayed applications, NOT RESCUE treatments. If significant rootworm damage has already occurred, these delayed applications will not provide effective control
For more information, see Ent_45, Corn rootworm beetle