Host Plants - Westcott's Plant Disease - page 668

R UST . Pucciniastrum sp. (II), OR, WA;
P. goeppertianum (III), Witches' Broom,
general; 0, I on fir; P. vaccinii (II, III), general;
0, I on hemlock.

C ANKER , Black. Physalospora miyabeana, New
England, NY, WV.
C ANKER , Twig and Branch. Botryosphaeria
ribis, VA to GA, AR, CA; Cryptodiaporthe
salicina, ME to VA, AK, CA, KS, OK, SD,
WA; Cryptomyces maximus, bark blister;
NM, UT; Discella carbonacea, twig blight,
New England; Dothiora polyspora, CO;
Dothiorella sp., AR, ND; Macrophoma
spp., AR, KY, MS, NC, SC, TX; Phomopsis
salicina, IA, MA, VA; Physalospora
gregaria, WV; Valsa spp., twig canker;
V. sordida ( Cytospora chrysosperma ), wide-
spread; V. salicina, widespread; V. nivea,
western states.
D ODDER . Cuscuta spp., IA, NY, WA.
L EAF B LISTER . Taphrina populi-salicis, CA.
L EAF S POT . Ascochyta salicis, CA; Cercospora
salicina, IL, LA, MD, TX; Ciborinia
foliicola; C. wisconsinensis;
Cylindrosporium salicinum, MA to CO,
MS, WI; Gloeosporium spp., also twig blight,
CT, DE, MA; G. salicis, VT to NJ, MS, OR,
WI; Marssonina spp., widespread;
M. kriegeriana, WI; M. apicalis, CA;
Myrioconium comitatum, WI; Phyllosticta
apicalis, KS, WI; Ramularia rosea, CO, MT,
WI; Septogloeum salicinum, AK, NY, WI;
S. maculans, CA, MT; S. salicis-fendlerianae,
ID; Septoria spp.; S. salicicola, AK, OR;
S. didyma,WI.
L EAF S POT , Tar. Rhytisma salicinum, MI.
M ISTLETOE . Phoradendron serotinum
(flavescens), AZ, CA, IN, NM, TX.
M ISTLETOE , European. Viscum album, CA.
N EMATODE , Lesion. Pratylenchus vulnus, CA.
N EMATODE , Root Knot. Meloidogyne sp.
P OWDERY M ILDEW . Uncinula salicis, general;
Phyllactinia corylea, WA.
R OT , Heart. Daedalea confragosa, widespread;
Fomes spp.; Polyporus farlowii, TX to CA;
Trametes

Wild Garlic (Allium vineale);
Wild Mustard (Brassica kaber)

W ILT , Water-soaked foliage. Sclerotinia minor,
NC.

Wild Rice (Zizania)

A NTHRACNOSE . Colletotrichum sublineolum,
MN.
B ACTERIAL Leaf Spot. Pseudomonas syringae
pv. syringae, MN, Pacific Northwest;
P. syringae pv. zizaniae, Pacific Northwest.
B LIGHT ,H EAD . Fusarium graminearum, MN.
L EAF S POT ,StemLesion.Bipolaris sorokiniana,
Pacific Northwest; Sclerotium oryzae, Pacific
Northwest; S. hydrophilum, Pacific Northwest.
L EAF S POT , Zonate. Drechslera gigantea, MN.
R OT , Crown, Root. Phytophthora
erythroseptica, CA; Damping-off. Pythium
torulosum, CA.
S MUT . Entyloma lineatum, Pacific Northwest;
Ustilago esculenta, CA.
V IRUS . Wheat Streak Mosaic, MN.

Wildrye (Elymus)

L EAF S POT . Pyrenophora trichostoma, ND;
Septorium spraguei, ND.

Willow (Salix) (Includes Weeping
Willow, Pussy Willow)

suaveolens, New England to

B ACTERIAL Crown Gall. Agrobacterium
tumefaciens, CT, NJ, TX, VA.
B ACTERIAL Wetwood. Erwinia nimipressuralis.
B LIGHT , Twig. Diplodia salicina.
B LIGHT , Willow. Complex of scab and black
canker.

MT, AK.
R OT , Root. Armillaria mellea, CA, WA;
Helicobasidium purpureum, TX;

Phymatotrichum omnivorum, TX.
R OT , Sapwood; Wood. Daedalea ambigua;
Ganoderma lucidum; Pholiota spp.;