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How to Manage Pests

UC Pest Management Guidelines


Cricket nymph.

Lettuce

Field Cricket

Scientific Name: Gryllus spp.

(Reviewed 8/07, updated 10/09)

In this Guideline:


DESCRIPTION OF THE PEST

Field cricket adults are shiny black or brown, 0.6 to 1.0 inch long, with long antennae. They often move into lettuce fields from cotton or infested uncultivated areas.

DAMAGE

Crickets are occasional pests, usually confined to sprinkler irrigated fields in the low desert. They can quickly destroy most of a field by eating seedlings; a number of plants in a row will be damaged.

MANAGEMENT

Apply a treatment when crickets threaten to migrate in.

Common name Amount/Acre** R.E.I.+ P.H.I.+
(trade name)   (hours) (days)

  Calculate impact of pesticide on air quality
When choosing a pesticide, consider information relating to the impact on natural enemies and honey bees and environmental impact. Not all registered pesticides are listed. Always read label of product being used.
 
A. CARBARYL
  (Sevin Bait 5%) 40 lb 12 See label
  MODE OF ACTION GROUP NUMBER1: 1A
 
B. CYPERMETHRIN*
  (Ammo) Label rates 12 5
  MODE OF ACTION GROUP NUMBER1: 3
  COMMENTS: For use on head lettuce only. Apply through chemigation.
 
C. PERMETHRIN*
  (Ambush, Pounce) Label rates 12 1
  MODE OF ACTION GROUP NUMBER1: 3
  COMMENTS: Do not use if leafminers are present.
 
D. ESFENVALERATE*
  (Asana XL) Label rates 12 7
  MODE OF ACTION GROUP NUMBER1: 3
  COMMENTS: For use on head lettuce only. Do not use if leafminers are present.
 
** Mix with enough 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: Lettuce
UC ANR Publication 3450
Insects and Other Arthropods
E. T. Natwick, UC Cooperative Extension, Imperial County
Acknowledgment for contributions to Insects and Mites:
W. E. Chaney, UC Cooperative Extension, Monterey County
N. C. Toscano, Entomology, UC Riverside

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