Table 2. Infestation rates in the common plant species.
KSHB infestation rates in the common riparian plant species in the Tijuana River Valley.
| Species | Common name | Family | # examined | # infested | % infested |
|---|---|---|---|---|---|
| Native species | |||||
| Salix lasiolepis Benth. | Arroyo willow | Salicaceae | 539 | 442 | 82% |
| Salix gooddingii C.R. Ball | Black willow | Salicaceae | 670 | 499 | 74% |
| Salix laevigata Bebb | Red willow | Salicaceae | 14 | 9 | 64% |
| Populus fremontii S. Watson | Western cottonwood | Salicaceae | 53 | 28 | 53% |
| Platanus racemosa Nutt. | California sycamore | Platanaceae | 28 | 6 | 21% |
| Baccharis salicifolia (Ruiz & Pav.) Pers. | Mule fat | Asteraceae | 486 | 76 | 16% |
| Baccharis pilularis DC. | Coyote brush | Asteraceae | 92 | 5 | 5% |
| Ambrosia monogyra* | Singlewhorl burrobrush | Asteraceae | 33 | 1 | 3% |
| Salix exigua Nutt | Narrow-leaf willow | Salicaceae | 88 | 1 | 1% |
| Malosma laurina (Nutt.) Nutt. Ex Abrams | Laurel sumac | Anacardiaceae | 7 | 0 | 0% |
| Peritoma arborea (Nutt.) H.H. Iltis | Bladderpod | Cleomaceae | 9 | 0 | 0% |
| Sambucus nigra L. | Blue elderberry | Adoxaceae | 31 | 0 | 0% |
| Scirpus spp. | Tule | Cyperaceae | 5 | 0 | 0% |
| Artemisia dracunculus L. | Tarragon | Asteraceae | 19 | 0 | 0% |
| Chloracantha spinosa (Benth.) G.L. Nesom | Spiny aster | Asteraceae | 2 | 0 | 0% |
| Isocoma vernonioides (Nutt.) G.L. Nesom | Coastal goldenbush | Asteraceae | 14 | 0 | 0% |
| Non-native species | |||||
| Schinus terebinthifolius Raddi | Brazilian pepper | Anacardiaceae | 15 | 7 | 47% |
| Nicotiana glauca Graham | Tree tobacco | Solanaceae | 40 | 8 | 20% |
| Ricinus communis L. | Castor bean | Euphorbiaceae | 123 | 16 | 13% |
| Eucalyptus spp. | Gum tree | Myrtaceae | 21 | 2 | 10% |
| Tamarix ramosissima Ledeb. | Salt cedar | Tamaricaceae | 32 | 1 | 3% |
| Tropaeolum majus L. | Garden nasturtium | Tropaeolaceae | 5 | 0 | 0% |
| Araujia sericifera Brot. | Cruel vine | Apocynaceae | 5 | 0 | 0% |
| Phytolacca icosandra L. | Tropical pokeweed | Phytolaccaceae | 5 | 0 | 0% |
| Schinus molle L. | Peruvian pepper | Anacardiaceae | 7 | 0 | 0% |
| Myoporum laetum G. Forst. | Myoporum | Scrophulariaceae | 16 | 0 | 0% |
| Acacia cyclops G. Don | Cyclops wattle | Fabaceae | 2 | 0 | 0% |
| Arundo donax L. | Giant reed | Poaceae | 42 | 0 | 0% |
| Immature plants (<1 year old) | |||||
| Salix gooddingii | Black willow | Salicaceae | 72 | 0 | 0% |
| Baccharis salicifolia | Mule fat | Asteraceae | 30 | 0 | 0% |
| Ricinus communis | Castor bean | Euphorbiaceae | 32 | 0 | 0% |
Notes.
*
(Torr. & A. Gray) Strother & B.G. Baldwin.