Description of the Pest
These small caterpillars web leaves or bracts together with silk and form a shelter in which they feed. They wiggle violently when disturbed.
Damage
Injury caused by these insects is sporadic, localized, and seldom of economic importance. Larvae feed on leaves, small squares, and on the surface of green bolls; injured bolls may open prematurely.
Management
Infestations are usually reduced by natural enemies. In Arizona, the suggested treatment threshold is when 25% of the plants have an active larva; California has not established a threshold.
| Common name | Amount per acre** | REI‡ | PHI‡ | |
|---|---|---|---|---|
| (Example trade name) | (hours) | (days) | ||
| Not all registered pesticides are listed. The following are ranked with the pesticides having the greatest IPM value listed first—the most effective and least harmful to natural enemies, honey bees, and the environment are at the top of the table. When choosing a pesticide, consider information relating to air and water quality, resistance management, and the pesticide's properties and application timing. Always read the label of the product being used. | ||||
| A. | METHOMYL* | |||
| (Lannate SP) | 0.5 lb | 72 | 15 | |
| (Lannate LV) | Label rates | 72 | 15 | |
| SELECTIVITY: Low | ||||
| PERSISTENCE: Pest: Short NE:2 Short | ||||
| MODE-OF-ACTION GROUP NUMBER 1: 1A | ||||
| COMMENTS: Do not graze or feed livestock. | ||||
| * | Permit required from county agricultural commissioner for purchase or use. |
| ** | Mix with sufficient water to provide complete coverage. |
| ‡ | Restricted entry interval (REI) is the number of hours (unless otherwise noted) from treatment until the treated area can be safely entered without protective clothing. Preharvest interval (PHI) is the number of days from treatment to harvest. In some cases, the REI exceeds the PHI. The longer of the two intervals is the minimum time that must elapse before harvest. |
| 1 | Group numbers for insecticides and miticides are assigned by the Insecticide Resistance Action Committee (IRAC). Rotate pesticides with a different mode-of-action group number, and do not use products with the same mode-of-action group number more than twice per season to help prevent the development of resistance. For example, the organophosphates have a group number of 1B; insecticides with a 1B group number should be alternated with insecticides that have a group number other than 1B. |
| 2 | NE = natural enemies |