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UC Pest Management Guidelines


Adult hoplia beetles, such as this Hoplia dispar, are reddish brown to silvery gray.

Grape

Hoplia Beetles

Scientific name: Hoplia spp.

(Reviewed 6/06, updated 10/08)

In this Guideline:


DESCRIPTION OF THE PESTS

Hoplia beetles are robust beetles that measure 0.25 to 0.3 inches long. The dorsum of the adult beetles is reddish brown and their heads are darker. The underside of the body is silvery and shiny. The whitish larvae are found in the ground and are C-shaped with a bulbous posterior. Adults emerge from the soil in spring and fly to vineyards to feed and mate.

DAMAGE

Feeding damage is usually sporadic within the vineyard but may recur annually in the same area. Plant injury usually occurs when shoots are 12 to 14 inches long and consists of feeding on developing fruit clusters and leaves.

MANAGEMENT

Damage by hoplia beetles occurs so seldom that in most cases spot treatments applied where damage is observed are sufficient. Spring treatments applied for other pests probably suppress most hoplia infestations that do occur. Few products are registered specifically for this use.

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

  Calculate impact of pesticide on air quality
The following materials are listed in order of usefulness in an IPM program, taking into account efficacy and impact on natural enemies and honey bees. When choosing a pesticide, also consider information relating to environmental impact. Not all registered pesticides are listed. Always read label of product being used.
 
A. PHOSMET
  (Imidan) 70W 1–2.12 lb 5 days 7-14
  MODE OF ACTION GROUP NUMBER1: 1B
 
B. CARBARYL*
  (Sevin) 80S 2.5 lb 12 7
  MODE OF ACTION GROUP NUMBER1: 1A
  COMMENTS: Extremely toxic to honey bees and may cause mite outbreaks. Do not use where mites are a chronic problem.
 
** Apply 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: Grape
UC ANR Publication 3448
Insects and Mites
W. J. Bentley, UC IPM Program, Kearney Agricultural Research Center, Parlier
L. G. Varela, UC IPM Program, Sonoma County
F. G. Zalom, Entomology, UC Davis
R. J. Smith, UC Cooperative Extension, Sonoma County
A. H. Purcell, Environmental Science, Policy and Management, UC Berkeley
P. A. Phillips, UC IPM Program, Ventura County
D. R. Haviland, UC IPM Program, Kern County
K. M. Daane, Kearney Agricultural Research Center, Parlier
M. C. Battany, UC Cooperative Extension, San Luis Obispo County
Acknowledgment for contributions to Insects and Mites:
J. Granett, Entomology, UC Davis

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