Biology Reference
In-Depth Information
L
EAF
S
POT
. Ascochyta cycadina, MO, TX;
Pestalotia cycadis (sec ondary), CT, FL.
V
IRUS
. Tobacco Ringspot, FL.
A destructive blight of unknown cause (but with
Gloeosporium
and
Phoma bresadolae
often asso-
ciated with it) causes pale green areas on pinnae of
young leaves, which are curled out of the flat plane
and dieback. The disease is apparently systemic
and increases annually until death. Eradication of
blighted plants is the only control suggested.
L
EAF
S
POT
. Cercospora
cynoglossi,
IN;
Phyllosticta
decidua, WI;
Ramularia
lappulae, WI, TX.
N
EMATODE
, Root Knot. Meloidogyne sp.
P
OWDERY
M
ILDEW
. Golovinomyces
cichoracearum, UT, VA, WY.
R
OT
,Root.Phymatotrichum omnivorum,TX.
R
OT
, Stem. Sclerotinia sclerotiorum, WA, Brit-
ish Columbia, Canada.
Cyclamen
Cypress (Cupressus)
A
NTHRACNOSE
. Colletotrichum fragariae, NC.
B
ACTERIAL
Tuber Rot. Erwinia carotovora, NJ,
NY, OH.
B
LIGHT
; Bud and Leaf Rot; Petal Spot. Botrytis
cinerea, cosmopolitan.
B
LIGHT
, Leaf and Bud. Glomerella cingulata,
IN, MA, MO, NJ, OH, PA, TX, VA.
L
EAF
S
POT
. Phyllosticta cyclaminicola, IL, OH,
TX; P. cyclaminis, VA; Systoria cyclaminis,
CA; Colletotrichum gloeosporioides,FL;C.
fragariae, FL; also lesions on flowers and stems.
L
EAF
S
POT
; Stunt; White Mold. Ramularia
cyclaminicola (
Cladosporium cyclaminis
),
CA, IL, MN, NJ, NY, OH, PA.
N
EMATODE
, Leaf. Aphelenchoides fragariae.
N
EMATODE
, Lesion. Pratylenchus pratensis, VA.
N
EMATODE
, Root Knot. Meloidogyne
B
ACTERIAL
Crown
Gall.
Agrobacterium
tumefaciens, AZ, CA, FL.
B
LIGHT
, Nursery. Phomopsis juniperovora, MD,
NC, VA.
B
LIGHT
, Seedling. Fusarium solani, TX.
B
LIGHT
, Twig. Coryneum asperulum, AL;
C. berckmansii, OR; Cercospora thujina,
AL, GA, LA; Pestalotia funerea, CA,
TX; Botryosphaeria sp., GA, on Arizona
cypress.
C
ANKER
. Seiridium cardinale, CA, Chile.
C
ANKER
, Bark. Seiridium unicorne, CA.
C
ANKER
;D
IEBACK
. Coryneum cardinale,on
Monterey, sometimes Italian cypress;
Cytospora cenisia, CA, on Italian cypress;
Macrophoma cupressi, AL, CA, FL, TX;
Monochaetia unicornis, GA, SC.
M
ISTLETOE
. Phoradendron sp., AZ, CA, OR.
N
EEDLE
C
AST
. Lophodermium sp., NJ.
N
EMATODE
, Lesion. Pratylenchus thornei.
R
OT
, Heart. Fomes pini, CA.
R
OT
,
sp.,
cosmopolitan.
R
OT
, Root. Thielaviopsis basicola, CT.
V
IRUS
. Impatiens Necrotic Spot, NC.
W
ILT
. Fusarium oxysporum f. sp. cyclaminis,
CA, NJ; Fusarium sp., NJ.
Discard plants with stunt; sterilize soil
and pots, and benches where diseased plants
have grown. Avoid splashing to reduce Botrytis
blight and leaf nematodes. Spray for blight and
leaf spots with zineb or ferbam.
Root.
Clitocybe
tabescens,
FL;
Phymatotrichum
omnivorum,
TX;
Phytophthora cinnamomi, LA.
R
OT
, Wood. Stereum taxodii, cause of “pecky”
cypress; Coniophora puteana, CA; Lenzites
saepiaria, cosmopolitan; Polyporus spp.;
Poria subacida; Steccherinum ochraceum.
R
UST
. Gymnosporangium cupressi (III), on Ari-
zona cypress.
Coryneum canker has killed thousands of
Monterey cypress trees in California, and
Cytospora canker has been fatal in a narrow belt
along the coast.
Cynoglossum (Hounds-Tongue)
B
LIGHT
, Southern. Sclerotium rolfsii, FL.
D
OWNY
M
ILDEW
. Peronospora cynoglossi, IL,
MD, TX.
