Host Plants - Westcott's Plant Disease - page 672

B ACTERIAL Wilt. Pseudomonas solanacearum,
FL.
B LIGHT . Alternaria zinniae, CO, CT, NJ, NY,
PA, SC.
B LIGHT , Flower. Alternaria alternata, TX.
B LIGHT , Head; Stem Canker. Botrytis cinerea,
CA, CT, NJ, OR, PA.
B LIGHT , Southern. Sclerotium rolfsii, FL, NJ.
D AMPING -O FF ; Root Rot. Rhizoctonia solani,
CA, NJ, TX.
L EAF S POT . Cercospora zinniae, SC to FL, CO,
IN, PA, TX.
L EAF S POT , Bacterial. Xanthomonas
nigromaculans f. sp. zinniae, NC, OH.
N EMATODE , Leaf. Aphelenchoides ritzemabosi,
DE, MA, NJ.
N EMATODE , Lesion. Pratylenchus nannus, MD;
P. penetrans, NJ.
N EMATODE , Root Knot. Meloidogyne sp., NJ, PA,
TX.
P OWDERY

Zauschneria (Fire-Chalice, California
Fuchsia)

R UST . Puccinia oenotherae (0, I, II, III),

CA, UT.

Zebra Plant (Aphelandra)

L EAF S POT . Myrothecium roridum, FL.
N ONPARASTITIC . Physiological. Leaf Crinkle;
Shortened Internodes, Axillary Bud Prolifera-
tion, TX.
R OT ,S TEM . Phytophthora parasitica, FL.

Zephyranthes (Atamasco-Lily,
Zephyr-Lily) M ILDEW . Golovinomyces

cichoracearum, general.
R OT , Blossom. Choanephora sp., FL.
R OT , Charcoal. Macrophomina phaseoli, TX.
R OT ,Root.Phymatotrichum omnivorum,TX.
R OT , Stem; Wilt. Fusarium sp., CO, IA, MO,
NY; Phytophthora cryptogea, NJ;
Sclerotinia sclerotiorum, CA, CO, MA,
MT, OR, PA, WA.
V IRUS . Cucumber Mosaic; Beet Curly Top;
Tobacco Etch, FL; Tomato Spotted Wilt;
Bidens Mottle, FL; Potato Leafroll, Pacific
Northwest; Sunflower Mosaic, TX.
Powdery mildew in late summer is the most
common zinnia disease.

L EAF S CORCH ; Red Spot. Stagonospora curtisii,
CA.
L EAF S POT . Colletotrichum liliacearum, NC.
R OT , Dry; Scale Speck. Sclerotium sp., OR.
R UST . Puccinia cooperiae (0, I, II, III), AL, FL,
NC, TX.

Zigadenus

R UST . Puccinia atropuncta (II, III), IA, MO, ND,
TX, WI; 0, I on composites; P. grumosa (0, I,
II, III), CO, MT, WY; Uromyces zygadeni
(0, I, II, III), CA, CO IA, KS, MT, NV, TX,
UT, WA, WY.
S MUT , Leaf. Urocystis flowersii, UT.

Zizia (Meadow Parsnip)

G ALL , Leaf. Urophlyctis ( Physoderma )

Zinnia

pluriannulata, IA, WI.
L EAF S POT . Ascochyta thaspii, WI; Cercospora
ziziae, PA, WI; Cylindrosporium ziziae, ND,
WA, WI; Septoria ziziae, ND.
P OWDERY M ILDEW . Erysiphe polygoni, PA, WV.
R UST . Puccinia ziziae (III), WA.

B ACTERIAL ; Leaf Spot, Flower Spot.
Xanthomonas campestris pv. zinniae, LA.
B ACTERIAL , MLO. Aster Yellows, MI, PA, and
California Aster Yellows, CA.