Host Plants - Westcott's Plant Disease - page 602

and spruce pines, FL; II, III on Forestiera ;
C. pinicola, DE to NC, TN; C. senecionis,
CO, RI; II, III on Senecio ; C. sonchiarvensis
(0, I), on Scotch pine, CT to NE; II, III
on sow-thistle; C. terebinthinaceae (0, I),
Southeast; II, III on Parthenium
and Silphium ; C. vernoniae (0, I), on two-and
three-needle pines East and South; II, III on
ironweed.
R UST ,

common discoloration caused by the pine shoot
moth.
V IRUS . Tomato Spotted Wilt, GA (in P. elliottii,
P. taeda, P. palustris ).
W ITCHES 'B ROOM . Elytroderma deformans,
CA.

Pineapple (Ananas)

Pine-Pine Gall. Endocronartium

harknessii, MN, MO, PA.
R UST , Pi˜on Blister. Cronartium occidentale.
R UST , Stem. Cronartium appalachianum (0, I),
NC, TN, VA; II, III on Buckleya ; C.
filamentosum; Peridermium weirii.
R UST , Sweet-Fern Blister. Cronartium
comptoniae, swellings on trunk and branches
of two-and three-needle pines from northeast-
ern to central and Great Lakes states; II, III on
sweet-fern and sweet gale.
R UST , Western Gall. Endocronartium
harknessii, VA, also twig necrosis and
Witches' Broom, MA, ND.
R UST , White Pine Blister. Cronartium ribicola
(0, I), swellings on trunk and branches of east-
ern white pine fromNew England to MN, NM,
VA; on western white pine in Pacific North-
west; on sugar pine, CA; on limber pine, ND,
SD, WY; II, III on gooseberry, currant, CA; on
whitebark pine, CA, CO, NV; Mt. Rainier
National Park and Crater Lake National Park.
S OOTY M OLD . Fumago vagans; Capnodium
pini, widespread; Scorias spongiosa.
White pine blister rust is, of course, our fore-
most disease of pines, and full details are given
under Rusts. Black currants are banned entirely
in infected areas, red currants within 300 feet of
pines. Of the other possible rusts on various
pines, the only one seen in northern gardens is
the aster rust ( Coleosporium asterum ), which is
slightly disfiguring to the needles but not very
damaging to general health. Fusiform rust is
serious in the South. Brown needles may be
due to one of the needle blights or needle cast
fungi and also to winter drying. New shoots of
Austrian pine turn brown from Diplodia tip
blight, which should not be confused with the

B ACTERIAL , Yeast Disease. Klebsiella sp.,

Candida sp., Brazil.
N EMATODE , Lesion. Pratylenchus brachyurus.
N EMATODE , Root Knot. Meloidogyne sp., FL.
N ONPARASITIC . Spike, Long Leaf, FL.
R OT , Leaf Base; White Leaf Spot. Ceratocystis
paradoxa, FL.
V IRUS . Pineapple Wilt-Associated, HI.
W ILT . Toxic effect of mealybug feeding.

Pipsissewa (Chimaphila)

L EAF S POT . Mycosphaerella chimaphilina, NY,
OR, PA, WA; Septoria chimaphilae, DE.
R UST . Pucciniastrum pyrolae (II, III), NY to
NC, CA, MT, OR, TN, WA, WI.

Pistachio (Pistacia)

B LIGHT ,R OT R OOT . Rhizoctonia solani, CA.
B LIGHT , Shoot. Botrytis cinerea, CA;
Sclerotinia sclerotiorum, CA;
Botryosphaeria rhodina, CA; Fusicoccum
(formerly Botryosphaeria ).
B LIGHT , Thread. Pellicularia koleroga, FL, TX.
L EAF S POT . Phyllosticta lentisci, TX; Septoria
pistaciarum, AZ, NM, TX; Alternaria sp.,
NM.
L EAF S POT , Brown. Microascus cirrhosis,Iran.
N EMATODE . Meloidogyne sp., CA; Xiphinema
index, CA.
R OT , Root. Phymatotrichum omnivorum, AZ,
CA, TX.