Biology Reference
In-Depth Information
or plant in a new location. Rogue plants with
yellows immediately; use systemic insecticides
to control insect vectors.
Aspidistra
B
LIGHT
, Leaf. Labrella aspidistrae, IL, LA.
L
EAF
S
POT
. Ascochyta aspidistrae, MN, NJ;
Colletotrichum omnivorum, CA, MO, NJ,
PA, WV.
Aster, Perennial (Aster spp.)
B
ACTERIAL
Crown
Gall.
Agrobacterium
tumefaciens, CT.
B
LACK
K
NOT
. Gibberidea heliopsidis, NE, NY,
ND, WI.
B
LIGHT
,GrayMold.Botrytis cinerea, AK, CT, NJ.
D
ODDER
. Cuscuta spp., eastern and central states.
D
OWNY
M
ILDEW
. Basidiophora entospora, IL,
IN, MD, MO, NE, WI.
G
ALL
,L
EAF
. Synchytrium nigrescens, WI.
L
EAF
S
POT
. Alternaria sp., MI, TX, VT; Ascochyta
compositarum,WI;Cercospora asterata,AL,
TX; Cercosporella cana, , WI;
Leptothyrium doelligeriae, NY; Ovularia
asteris,WY;O. virgaureae,CO,MS,WI;
Phyllachora sterigena,KS,NE;Ramularia
asteris, IA, MI, NE, TX, WI, WY; Septoria
angularis
Aster, China (Callistephus)
A
NTHRACNOSE
. Colletotrichum sp., FL.
B
ACTERIAL
, MLO. Aster Yellows, general.
B
LIGHT
, Bud, Stem; Gray Mold. Botrytis cinerea,
AK, CA, CT, IL, NJ, NY, PA, WI.
B
LIGHT
, Petal. Itersonilia perplexans, FL.
B
LIGHT
, Southern. Sclerotium rolfsii, MS, NC.
C
ANKER
, Stem. Phomopsis callistephi, IL, WI.
D
ODDER
, Cuscuta spp., widespread.
D
OWNY
M
ILDEW
. Basidiophora entospora, FL,
TX.
L
EAF
S
POT
. Ascochyta asteris, CA, NY, ND, OH;
Septoria callistephi, AL, DE, MI, MO, NJ,
NY, OH, PA.
M
OLD
, Seed. Pleospora herbarum, cosmopoli-
tan; Alternaria sp.
N
EMATODE
, Root Knot. Meloidogyne sp., CT, FL,
TX, WA.
P
OWDERY
M
ILDEW
. Golovinomyces
cichoracearum, DE, MN, NE, NC, TN, VT,
WA; Erysiphe polygoni, NJ.
R
OT
, Foot. Phytophthora cryptogea; Pythium
ultimum.
R
OT
, Root and Stem; Leaf Blight. Rhizoctonia
solani, widespread, chiefly in northeastern and
central states; Phymatotrichum omnivorum,
TX.
R
UST
. Coleosporium asterum (
C. solidaginis
)
(II, III), general except far South; II, III on
two- and three-needle pines.
V
IRUS
. Beet Curly Top, OR; Tobacco Rattle
(aster strain of); Tomato Spotted Wilt, CA;
Bidens Mottle, FL.
W
ILT
. Verticillium sp., CA, CT, IL, MA, NY.
W
ILT
, Stem Rot. Fusarium oxysporum f. sp.
callistephi, general.
Fusarium wilt and aster yellows are the two
principal diseases. Choose wilt-resistant varieties
and other
species;
Phyllosticta
astericola,TX.
L
EAF
S
POT
, Black, Tar. Placosphaeria haydeni
(
Discosphaerina pseudi mantia
), IA, NJ, NY,
ND.
N
EMATODE
, Leaf. Aphelenchoides ritzemabosi,
CT.
N
EMATODE
, Root Knot. Meloidogyne sp.
P
ARASITIC
L
ICHEN
.
Strigula
elegans,
S. complanata, LA, Southern U.S.
P
OWDERY
M
ILDEW
.
Golovinomyces
cichoracearum, general.
R
OT
,Root.Phymatotrichum omnivorum,TX.
R
OT
, Stem. Sclerotinia sclerotiorum, CT.
R
UST
. Coleosporium asterum (II, III); Puccinia
asteris (III), general; P. dioicae var. asteris
(0, I); II, III on sedge; P. grindeliae (III), CO,
KS, NV, WY; P. stipae (0, I), CO, IA, KS, NE,
ND, SD; Uromyces compactus, AZ, NM,
TX; U. junci (0, I), NH.
S
MUT
, White. Entyloma aster-seriaceanum,
WI; E. compositarum, ME, MA, SD, WI.
V
IRUS
. Aster Chlorotic Stunt; Mosaic.
Unidentified, CA; Tomato Spotted Wilt, CA.
W
ILT
. Verticillium albo-atrum, CT.
