This information was developed for North Carolina and may not apply to other areas.

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Table Legend

* Degree of importance of pest: I = Important pest, high probability of occurrence; II = Treat as needed; III = Occasional pest, treat when detected.

** Number of applications needed for most effective control. It is usually best to wait 10 to 14 days between applications in cool weather and 7 to 10 days between applications in warm weather.

G = granular; P = prune out infested twigs or branches; S = spray application.

The Rhododendron Pest Management Calendar gives approximate dates for pest emergence.

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The Rhododendron Pest Management Calendar gives approximate dates for pest emergence.

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* Degree of importance of pest: I=Important pest, high probability of occurrence, II=Treat as needed: III=Occasional pest, treat when detected.

** Number of applications needed for most effective control. It is usually best to wait 10 to 14 days between applications in cool weather and 7 to 10 days between applications in warm weather.

• Azalea Stem Borer. Frank, S. and J. R. Baker. 2020 (revised). Entomology Insect Notes, NC State Extension Publications.
• Black Vine Weevil. Frank, S. et al. 2020 (revised). Entomology Insect Notes, NC State Extension Publications.
• Caterpillars That Feed on Trees and Shrubs. Frank, S. and S. Bambara. 2009. Entomology Insect Notes, NC State Extension Publications.
• Rhododendron Borer. Baker, J. R. 2021 (revised). PDIC Factsheets, NC State Extension Publications.
• Rhododendron Gall Midge. Baker, J. R. 2019 (revised). PDIC Factsheets, NC State Extension Publications.
• Lace Bugs. Frank, S. 2019 (revised). Entomology Insect Notes, NC State Extension Publications.
• Twobanded Japanese Weevil. Frank, S. and J. R. Baker. 2019 (revised). Entomology Insect Notes, NC State Extension Publications.
• Insect and Related Pests of Shrubs. Baker, J. R. ed. 1980. NC Agricultural Extension Service publication AG-189. 199 pp.
• North Carolina Agricultural Chemicals Manual
• Extension Plant Pathology Publications and Factsheets
• Horticultural Science Publications
• Search for more information on insects from NC State Extension

For assistance with a specific problem, contact your local N.C. Cooperative Extension Center.

This Insect Note has not been peer reviewed.