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How to Manage Pests

UC Pest Management Guidelines

| More pests | More crops | About guidelines |

Adult mountain leafhopper.

Cherry

Mountain Leafhopper

Scientific Name: Colladonus montanus

(Reviewed 4/06, updated 4/06)

In this Guideline:

DESCRIPTION OF THE PEST

The mountain leafhopper is a slender, dark brown leafhopper with red eyes and a yellow band behind the head and a yellow spot in the center of each wing. The leafhopper overwinters in weedy sugarbeet fields. If the beets are harvested in spring, the leafhopper disperses to adjacent orchards and can be widely distributed throughout an orchard within a few days. A second peak of leafhoppers may be seen in late July. This leafhopper does not prefer cherry trees, but breeds on weeds (curly dock, California burclover, sweetclovers) on the orchard floor.

DAMAGE

This leafhopper is a vector of cherry buckskin disease (see CHERRY BUCKSKIN for description). It acquires the disease agents by feeding on diseased cherry trees or infected weeds such as clover. It then may infect healthy cherry trees.

MANAGEMENT

Treat immediately after harvest and at 4- to 6- week intervals thereafter. Length of interval depends on residual effectiveness of material used. Consult local farm advisor for timing of application. Remove buckskin-diseased trees immediately after treatment so that the leafhoppers are destroyed before trees are removed.

Common name Amount to Use** P.H.I.+
(trade name) (conc.) (dilute) (days)
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.
 
POSTHARVEST
A. ESFENVALERATE*
  (Asana XL) 0.66EC 4.8–14.5 oz 2.0–5.8 oz  
  MODE OF ACTION: A pyrethroid (Group 3)1 insecticide.
  COMMENTS: Provides long-term control. May cause serious outbreaks of spider mites. Do not exceed 0.375 lb a.i./acre/season.
 
B. THIAMETHOXAM
  (Actara) 25WDG 4 oz 1 oz 14
  MODE OF ACTION: A neonicotinoid (Group 4A)1 insecticide.
  COMMENTS: May only be applied once after bloom. Do not apply by air. Repeat applications of any neonicotinoid insecticide (imidacloprid-Admire, Provado; thiamethoxam-Actara) can lead to resistance to all neonicotinoids. Alternate neonicotinoids with an insecticide that has a different mode of action to help delay the development of resistance.
 
C. CARBARYL*
  (Sevin) 80S 5 lb 1.25 lb  
  (Sevin) XLR PLUS 4 qt 1 qt  
  MODE OF ACTION: A carbamate (Group 1A)1 insecticide.
  COMMENTS: May cause increased spider mite problems. Do not apply more than 17.5 lb Sevin 80S or 14 qt XLR PLUS/acre/season. The XLR PLUS formulation is less hazardous to honey bees than other formulations if applied from late evening to early morning when bees are not foraging.
 
D. DIAZINON* 50WP 2 lb 0.5 lb  
  MODE OF ACTION: An organophosphate (Group 1B)1 insecticide.
  COMMENTS: Provides only immediate control. No control 2 days after application. Avoid drift and tailwater runoff into surface waters. Where cherries are grown adjacent to waterways, do not use this material.
 
 
**  For concentrate applications, use the amount given in 80–100 gal water/acre, or lower if the label allows; for dilute applications, amount is per 100 gal water to be applied in 300–400 gal water/acre, according to label.
* Permit required from county agricultural commissioner for purchase or use.
1 Modes of action are important in preventing the development of resistance to pesticides. 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. 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 is 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: Cherry
UC ANR Publication 3440
Insects and Mites
R. A. Van Steenwyk, Insect Biology, UC Berkeley
K. M. Daane, Kearney Agricultural Center, Parlier
J. A. Grant, UC Cooperative Extension, San Joaquin County

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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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/r105301711.html revised: April 18, 2006. Contact webmaster.