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How to Manage Pests
UC Pest Management Guidelines
Grape
Leadcable Borer
Scientific name: Scobicia declivis
(Reviewed 6/06,
updated 6/06)
In this Guideline:
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Leadcable borer is a cylindrical black beetle, 0.25 to 0.35 inch
long, that emerges from round holes in trunks or cordons of damaged vines and
from dead wood during spring and early summer. The head of the leadcable borer
is mostly concealed from above by a hoodlike pronotum. Larvae are 0.35 inch
long and cream colored with a small, dark head. The larvae are C-shaped and may
be found feeding in tunnels on the vine. This beetle is not a common pest of
grape, but has been observed in San Joaquin County and North Coast vineyards.
It has also been reported to infest oak wine barrels and corks.
Adults bore into wood to prepare egg tunnels. Leadcable borer larvae
feed in trunk or cordon wood for up to 9 months during development, creating
frass-filled tunnels that can weaken vine structure. They can reinfest the wood
from which they emerge. Distribution of infested vines is typically localized
within vineyards.
The best method of control is good sanitation. Remove prunings and
dead wood from the vineyard and destroy by burning or by thoroughly discing or
flailing before adults emerge in spring. Remove dead or damaged wood from
vines. Leadcable borer can become a chronic problem in infested vineyards and
may take several years to control by cultural means. No material is registered
specifically for this pest; however, sprayable materials used for cutworms,
grape leaffolder, and other species applied when adult beetles are present may
also help control leadcable borer. Once this borer is in the wood, however,
chemical control is not effective.
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UC IPM Pest Management Guidelines: Grape
UC ANR Publication 3448
Insects and Mites
W. J. Bentley, UC IPM Program, Kearney Agricultural Research Center, Parlier
L. G. Varela, UC IPM Program, Sonoma County
F. G. Zalom, Entomology, UC Davis
R. J. Smith, UC Cooperative Extension, Sonoma County
A. H. Purcell, Environmental Science, Policy and Management, UC Berkeley
P. A. Phillips, UC IPM Program, Ventura County
D. R. Haviland, UC IPM Program, Kern County
K. M. Daane, Kearney Agricultural Research Center, Parlier
M. C. Battany, UC Cooperative Extension, San Luis Obispo County
Acknowledgment for contributions to Insects and Mites:
J. Granett, Entomology, UC Davis
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