How to Manage Pests
UC Pest Management Guidelines
Peach Silver Mite
Scientific Name: Aculus cornutus
In this Guideline:
DESCRIPTION OF THE PEST
Peach silver mites are tiny, four-legged eriophyid mites, yellow to
pinkish white, and somewhat wedge shaped, being broadest just behind the
anterior end. Because they are so tiny, they are difficult to see without a
hand lens of at least 10x power.
Peach silver mites overwinter as females in
bark crevices, around buds, and under bud scales. They move to leaves soon after
budbreak in spring. These mites can also be found on small fruit, often
inhabiting the area between the calyx and the fruit. Later in the season they
are found primarily on the lower leaf surface. Before leaf fall, females move
to overwintering sites. Many generations are produced during the season.
On rare occasions when very high populations of peach silver mite
survive the winter, they produce symptoms on the unfolding leaves. Symptoms
consist of minute, yellow spots and a tendency for the leaf edges to curl
toward the midrib. Ordinarily, however, most injury is not noticed until mid-
to late summer when heavily infested leaves take on a silvery appearance.
Treatments applied specifically for control of peach silver mite are
rarely needed and should be avoided because peach silver mites serve as early
season food for predaceous mites, which in turn aid in reducing populations of other pest mites. The
use of broad-spectrum insecticides for other pests can cause high infestations
of peach silver mite.
Sulfur sprays are acceptable for organically certified crops, but will
reduce predator mite populations.
Monitoring and Treatment
If heavy populations (200–300 per leaf) of peach silver mite are
present and causing damage, consider applying sulfur or miticides used for
control of other mite species. Some insecticides applied for control of other
pests eliminate peach silver mites as well.
choosing a pesticide, consider information relating to impact
on natural enemies and honey bees, the impact
of the timing on beneficials, and environmental impact. Not all registered pesticides are listed. Always read label of product
||MODE OF ACTION: Unknown. An inorganic miticide.
Do not apply within 2 weeks of oil spray. May reduce predator mite populations.
UC IPM Pest Management Guidelines: Nectarine
UC ANR Publication 3451
Insects and Mites
W. J. Bentley, UC IPM Program, Kearney Agricultural Center, Parlier
K. R. Day, UC Cooperative Extension, Tulare County
Acknowledgment for contributions to Insects and Mites:
R. E. Rice, Kearney Agricultural Center, Parlier
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