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How to Manage Pests
UC Pest Management Guidelines
Nectarine
Prune Limb Borer and American Plum Borer
Scientific Names:
Prune Limb Borer: Bondia comonana
American Plum Borer: Euzophera semifuneralis
(Reviewed 6/06,
updated 6/06)
In this Guideline:
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DESCRIPTION OF THE PESTS
Prune limb borer and American plum borer are sporadic pests in young
stone fruit orchards from Tehama County to Kern County. Young larvae are white
with a large, dark brown head; when mature, larvae are about 1 inch long with a
dull white or pinkish body. The larva overwinters in a cocoon within the tree. Adult moths emerge in April and May. Females lay eggs on callus tissue near pruning
wounds, in scaffold crotches of young trees, near graft unions, or on crown
galls. The forewings of the moth are gray with brown and black marks and have a
wingspan of about 0.75 inch.
DAMAGE
Larvae bore into the tree leaving reddish orange frass and
gum pockets. The boring is most damaging to the scaffold crotches or
graft unions of young trees. Vigorous trees will heal over, but with heavy, prolonged
infestations, scaffolds may break with wind or a heavy crop.
Monitor young orchards in spring and summer for frass and gum
pockets which tend to be very visible if present. If larvae are present, spray
trees from 1 foot above the scaffold crotch to 1 foot below, two to three times
during the growing season. Make the first application from mid- to late April
and subsequent applications at 6-week intervals.
| Common name |
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P.H.I.+ |
| (trade name) |
Amount to Use |
(days) |
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following materials are listed in order of usefulness in an IPM program,
taking into account efficacy, impact
on natural enemies and honey bees, and impact
of the timing on beneficials. When choosing
a pesticide, also consider information relating to environmental impact.
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| A. |
CARBARYL* |
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(Sevin) 80S |
0.4 lb/gal water |
1 |
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MODE
OF ACTION: A carbamate (Group 1A)1 insecticide.
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COMMENTS: Use a hand-held sprayer. |
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| B. |
DIAZINON* 50WP
| 0.75 lb/gal water |
21 |
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MODE
OF ACTION: An organophosphate (Group 1B)1 insecticide.
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COMMENTS: For in-season use only. Use a hand-held sprayer. |
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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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