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UC IPM Home > Homes, Gardens, Landscapes, and Turf > Trees and Shrubs > Invertebrates
How to Manage Pests
Pests in Gardens and Landscapes
Rhododendron species resistant to feeding by adult root weevils.*
| Species |
Series |
Possible Bloom Colors |
Rating* |
| heliolepis |
Heliolepis |
white, rose |
100 |
| impeditum |
Lapponicum |
purplish blue |
100 |
| scintillans |
Lapponicum |
purplish blue |
100 |
| burmanicum |
Maddenii |
yellow to greenish white |
100 |
| dauricum |
Dauricum |
lavender-rose |
97 |
| intricatum |
Lapponicum |
mauve |
97 |
| desquamatum |
Heliolepis |
rose, violet |
93 |
| ferrugineum |
Ferrugineum |
rose, white |
93 |
| hemsleyanum |
Fortunei |
white |
93 |
| minus |
Carolinianum |
rose, white |
93 |
| cuneatum |
Lapponicum |
rose |
90 |
| fastigiatum |
Lapponicum |
lilac, purple |
90 |
| yakusimanum |
Ponticum |
white, rose |
90 |
| ungernii |
Ponticum |
white, pale pink |
83 |
| rubiginosum |
Heliolepis |
pink, rose |
83 |
| irroratum |
Irroratum |
white, ivory, rose |
83 |
| carolinianum |
Carolinianum |
pink, mauve, white |
80 |
| oreodoxa |
Fortunei |
rose, white |
80 |
| racemosum |
Virgatum |
white, rose |
80 |
| russatum |
Lapponicum |
blue-purple |
80 |
| adenophorum |
Taliense |
rose |
77 |
| campylogynum |
Campylogynum |
pink, purple, crimson |
77 |
| oreotrephes |
Triflorum |
mauve, purple, rosy red |
77 |
| vernicosum |
Fortunei |
white, rose |
77 |
| xanthocodon |
Cinnaborinum |
ivory, yellow |
77 |
| arizelum |
Falconeri |
white, yellow, rose, crimson |
73 |
| cardiobasis |
Fortunei |
white, rose |
73 |
| decorum |
Fortunei |
white, pink, chartreuse |
73 |
| diaprepes |
Fortunei |
white, pale rose |
73 |
| eurysiphon |
Thomsonii |
ivory, rose |
73 |
| glaucophyllum |
Glaucophyllum |
white, rose |
73 |
| hippophaeoides |
Lapponicum |
lilac, rose |
73 |
| lepidastylum |
Trichocladum |
pale yellow |
73 |
| pemokoense |
Uniflorum |
lilac-pink |
73 |
| praestans |
Grande |
magenta-rose, pink |
73 |
| pubsescens |
Scabrifolium |
white, rose |
73 |
| imperator |
Uniflorum |
pink, rose |
70 |
| ciliatum |
Maddenii |
white, rose |
70 |
| concatenans |
Cinnaborinum |
apricot, yellow |
70 |
| davidsonianum |
Triflorum |
white, pink, rose |
70 |
| discolor |
Fortunei |
white, pink |
70 |
| yunnanense |
Triflorum |
white, lavender, pink |
70 |
*The higher the number, the less feeding is expected. A 100 rating indicates complete resistance to black vine weevil (Otiorhynchus sulcatus), clay-colored weevil (Otiorhynchus singularis), Dyslobus species, obscure root weevil (Sciopithes obscures), and woods weevil (Nemocestes incomptus).
Source: Antonelli AL, Campbell RL. 2007. Root Weevil Control on Rhododendrons. Washington State University Extension Bulletin 0970E.
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