UC IPM Online UC ANR home page UC IPM home page

UC IPM Home

Search

SKIP navigation
How to Manage Pests

Home & garden
Agriculture
Natural environments
Exotic & invasive

Weather data & products
Degree-days
Interactive tools & models

Educational Resources

Publications & more
Workshops and events
Training programs
Pesticide information

Research and IPM

Grants programs
Funded-project results

 
  Printer-friendly version

How to Manage Pests

UC Pest Management Guidelines

| More pests | More crops | About guidelines |

Mature larva of omnivorous leafroller, Platynota stultana.

Cotton

Omnivorous Leafroller and False Celery Leaftier

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

(Reviewed 1/08, updated 1/08)

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/Acre** R.E.I.+ P.H.I.+
(trade name)   (hours) (days)
When choosing a pesticide, consider information relating to efficacy, selectivity, persistence, impact on honey bees and enviromental impact.
 
A. METHOMYL*
  (Lannate) SP 0.5 lb 72 15
  (Lannate) LV 2–2.25 pt 72 15
  SELECTIVITY: Low
  PERSISTENCE: Pest–Short; Natural Enemies–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/.

[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, Kearney Agricultural Center, Parlier
E. T. Natwick, UC Cooperative Extension, Imperial Co.
D. R. Haviland, UC IPM Program, Kern Co.
Acknowledgment for contributions to the insects and mites section:
E. E. Grafton-Cardwell, Kearney Agricultural Center, Parlier
N. C. Toscano, Entomology, UC Davis

Top of page

Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2008 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See How to manage pests, or in the U.S., contact your local Cooperative Extension office for assistance. /PMG/r114301311.html revised: January 30, 2008. Contact webmaster.