Warrior II has contact and ingestion activity. It is toxic to many kinds of insects with a relatively long duration of impact from residues. This and other pyrethroid insecticides (Group 3) should not be used mid-season because they kill predatory insects that help to keep aphids, psyllids, thrips, and spider mites in check. Warrior II is not systemic or translaminar, but residues should persist for 7-14 days. Re-apply if needed to protect new foliage. High water volumes help with product distribution. Make only two consecutive applications before rotating to an insecticide with a different MOA. Similar products with lambda-cyhalothrin are available but use rates vary.
Restricted
Material Type:
Insecticides and Repellents
Chemical Classification:
Pyrethroid
Signal Word:
Warning
Formulation:
Liquid
EPA Number:
100-1295
Usage for lambda-cyhalothrin on Potatoes
Max Application per Season: 7.68fl oz
Emergence to Row Closure
| Target | Application per Acre | REI | PHI | MOA | Eff. | Notes |
|---|---|---|---|---|---|---|
| Aphid | 1.28-1.92 fl oz | 24 h | 7 d | 3 | F-P | Apply before aphid populations start to build, and it is before mid-June. Not particularly effective for aphids. |
| Armyworms, Cutworms, Loopers | fl oz | 24 h | 7 d | 3 | G | Apply when small caterpillars are present, but only if it’s before mid-June. |
| Beet Leafhopper | 0.96-1.6 fl oz | 24 h | 7 d | 3 | G | Apply in May and June to minimize spread of phytoplasma diseases (e.g., purple top) if BLH populations are building. |
| Colorado Potato Beetle | 1.28-1.92 fl oz | 24 h | 7 d | 3 | G | Apply at 50% egg hatch while larvae are small, but only if it’s before mid-June. |
| Lygus Bugs | 1.28-1.92 fl oz | 24 h | 7 d | 3 | G | Apply when nymphs are present before mid-June. |
| Potato Psyllid | 1.28-1.92 fl oz | 24 h | 7 d | 3 | G (n+a) | Apply when adult psyllids are migrating into the field and it’s before mid-June. If early nymphs are present, it may not control nymphs on the underside of leaves where the product is not well distributed. |
Tuber Bulking
| Target | Application per Acre | REI | PHI | MOA | Eff. | Notes |
|---|---|---|---|---|---|---|
| Aphid | 1.28-1.92 fl oz | 24 h | 7 d | 3 | P | Use of pyrethroid insecticides is not recommended mid-season. Not very effective for aphids. If used, apply before aphid populations build. Monitor for subsequent pest outbreaks. |
| Armyworms, Cutworms, Loopers | fl oz | 24 h | 7 d | 3 | P | Use of pyrethroid insecticides is not recommended mid-season. If used, apply when small caterpillars are present. Monitor for subsequent pest outbreaks. |
| Colorado Potato Beetle | 1.28-1.92 fl oz | 24 h | 7 d | 3 | P | Use of pyrethroid insecticides is not recommended mid-season. If used, apply when larvae are small. Monitor for subsequent pest outbreaks. |
| Lygus Bugs | 1.28-1.92 fl oz | 24 h | 7 d | 3 | P | Use of pyrethroid insecticides is not recommended mid-season. If used, apply when nymphs are present. Monitor for subsequent pest outbreaks. |
| Potato Psyllid | 1.28-1.92 fl oz | 24 h | 7 d | 3 | P | Use of pyrethroid insecticides is not recommended mid-season. If used, apply when psyllids are present. It may not control nymphs on the underside of leaves where the product is not well distributed. Monitor for subsequent pest outbreaks. |
Late Tuber Bulking to Harvest
| Target | Application per Acre | REI | PHI | MOA | Eff. | Notes |
|---|---|---|---|---|---|---|
| Colorado Potato Beetle | 1.28-1.92 fl oz | 24 h | 7 d | 3 | G-F | Apply at 50% egg hatch while larvae are small. |
| Potato Psyllid | 1.28-1.92 fl oz | 24 h | 7 d | 3 | G (n+a) | Apply when psyllids are migrating into the field. |
| Tuberworm | 1.28-1.92 fl oz | 24 h | 7 d | 3 | E | Target PTW larvae feeding in the canopy in the weeks prior to vine desiccation or harvest. PHI is 7-days. Ground or air application to dense canopies may not provide sufficient coverage or lower leaves, use sufficient water carrier. Use only 0.1 to 0.2-inches of water with chemigation. |