How to Manage Pests

UC Pest Management Guidelines

Cotton

Omnivorous Leafroller and False Celery Leaftier

Scientific Names:
Omnivorous leafroller: Platynota stultana
False celery leaftier: Udea profundalis

(Reviewed 5/13, updated 5/13)

In this Guideline:


Description of the Pests

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** R.E.I.‡ P.H.I.‡
(example trade name)   (hours) (days)

  Calculate impact of pesticide on air quality
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, also consider information relating to air and water quality, resistance management, and the pesticide's properties and application timing. Not all registered pesticides are listed. 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 NUMBER1: 1A
  COMMENTS: Do not graze or feed livestock.
 
** Mix with sufficient water to provide complete coverage.
Restricted entry interval (R.E.I.) is the number of hours (unless otherwise noted) from treatment until the treated area can be safely entered without protective clothing. Preharvest interval (P.H.I.) is the number of days from treatment to harvest. In some cases the REI exceeds the PHI. The longer of two intervals is the minimum time that must elapse before harvest.
* Permit required from county agricultural commissioner for purchase or use.
1 Rotate chemicals 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; chemicals with a 1B Group number should be alternated with chemicals that have a Group number other than 1B. Mode of action Group numbers are assigned by IRAC (Insecticide Resistance Action Committee). For additional information, see their Web site at http://www.irac-online.org/.
2 NE = natural enemies

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Cotton
UC ANR Publication 3444

Insects and Mites

  • L. D. Godfrey, Entomology, UC Davis
  • P. B. Goodell, UC IPM Program and Kearney Agricultural Research and Extension Center, Parlier
  • E. T. Natwick, UC Cooperative Extension - Desert Research and Extension Center, Imperial County
  • D.R. Haviland, UC Cooperative Extension, Kern County and UC IPM Program
  • V. M. Barlow, UC Cooperative Extension, Riverside County and UC IPM Program
Acknowledgment for contributions to Insects and Mites:
  • E. E. Grafton-Cardwell, Kearney Agricultural Research and Extension Center, Parlier
  • N. C. Toscano, Entomology, UC Riverside

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