UC IPM: UC Management Guidelines for Black Peach Aphid on Nectarine

UC Pest Management Guidelines

Nectarine

Black Peach Aphid

Scientific Name: Brachycaudus persicae

(Reviewed 6/06, updated 6/06)

In this Guideline:

Description of the pest
Damage
Management

DESCRIPTION OF THE PEST

In California, this aphid is most prevalent in the San Joaquin Valley. Winged and wingless adults of the black peach aphid are shiny black and about 0.1 inch long. The nymphs are reddish brown. Wingless forms overwinter on the roots of nectarine and other closely related trees. In early spring, some migrate from roots to new growth and start colonies on the young leaves. Several generations of female aphids are produced. In early summer, winged adults are produced and migration to other trees occurs. Aboveground colonies usually disappear by midsummer as wingless forms migrate to the roots to feed and overwinter.

DAMAGE

Injury consists of leaf curling, yellowing, and premature drop. If aphids are abundant, honeydew excretion may cause black sooty mold to appear on leaves and fruit. Ants may also become a problem.

In spring when growth begins, look for colonies of this aphid when monitoring other pests. If this aphid has presented problems in the past, take control measures in spring.

Common name

Amount to Use**

P.H.I.+

(trade name)

(conc.)

(dilute)

(days)

When choosing a pesticide, consider information relating to impact on natural enemies and honey bees, the impact of the timing on beneficials, and environmental impact.

IMIDACLOPRID

(Provado) 1.6F

4 fl oz

1 fl oz

MODE OF ACTION: A neonicotinoid (Group 4A)¹ insecticide.

COMMENTS: Apply as foliar spray after pollination is complete and bees are no longer present in the orchard. Thorough, uniform coverage is essential. Do not apply more than 24 fl oz/acre/crop. Use allowed under a supplemental label.

**	For dilute applications, rate is per 100 gal water to be applied in 300-500 gal water/acre, according to label; for concentrate applications, use 80-100 gal water/acre, or lower if the label allows.
+	Preharvest interval. Do not apply within this many days of harvest.
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/.

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 the insects and mites section:
R. E. Rice, Kearney Agricultural Center, Parlier

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