How to Manage Pests

UC Pest Management Guidelines

Apple

Italian Pear Scale

Scientific name: Epidiaspis leperii

(Reviewed 8/06, updated 3/09)

In this Guideline:


DESCRIPTION OF THE PEST

Italian pear scale overwinters mostly as a mature scale. The cover is circular, about 0.06 inch in diameter, and light gray, but with a brown peak slightly off-center. Underneath the covering, the female's body is reddish purple.

DAMAGE

This scale does not attack fruit, but feeds directly on the wood of the tree, affecting tree vigor and causing reduced fruit size. Apple trees can tolerate fairly high populations of this scale without any apparent damage.

MANAGEMENT

Although widely distributed, Italian pear scale is rarely a pest in commercial apple orchards.

Organically Acceptable Methods

Lime treatments are organically acceptable.

Treatment Decisions

Generally, dormant sprays applied for other scales keep Italian pear scale under control unless limbs are heavily covered with moss and lichens. In this case, remove the moss and lichen or add Bordeaux mixture to the dormant spray to kill them. For more information on Bordeaux mixtures and how to mix them, see UC IPM Pest Note: Bordeaux Mixture, ANR Publication 7481.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Apple
UC ANR Publication 3432

Insects and Mites

L. R. Wunderlich, UC Cooperative Extension, El Dorado County
J. L. Caprile, UC Cooperative Extension, Contra Costa County
P. M. Vossen, UC Cooperative Extension, Sonoma/Marin counties
L. G. Varela, UC IPM Program, Sonoma County
J. A. Grant, UC Cooperative Extension, San Joaquin County

Acknowledgment for contributions to Insects and Mites:
H. L. Andris, UC Cooperative Extension, Fresno County
W. J. Bentley, UC IPM Program, Kearney Agricultural Center, Parlier
W. W. Coates, UC Cooperative Extension, San Benito County
C. Pickel, UC IPM Program, Sutter/Yuba counties

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