Agriculture Reference
In-Depth Information
Table 11.1.
Continued.
Common name; synonyms (previous
names), other
species and races
Symptoms or signs
Causal agent
Distribution
Foliage
Tubers
Phytophthora erythroseptica
Pethybr.
Pink rot;
Phytophthora cryptogea
,
Phytophthora drechsleri
,
Phytoph-
thora megasperma
,
Phytophthora
nicotianae
var.
parasitica
Worldwide
Wilt, premature senescence
Characteristic pink tuber rot
or can be brownish if
P. nicotianae
Pythium ultimum
Tr o w.
Leak or watery wound rot;
Pythium
aphanidermatum
,
Pythium
deliense
Worldwide
None
Wet rot often accompanied by
bacterial soft rot
FUNGI
Alternaria
alternata
(Fries.)
Keissler =
Alternaria tenuis
Ness.
Brown leaf spot and tuber black pit
Worldwide
Progressive necrosis and
eventual defoliation
Skin lesions and some pitting
Alternaria solani
(E&M)
Jones & Grout
Early blight
Worldwide
Progressive necrosis and
eventual defoliation
Tuber pitting
Botrytis cinerea
Pers.:Fr.
Botryotinia fuckeliana
(de
Bary) Whetzel [teleomorph]
Gray mold or tan spot
Worldwide
Leaf necrosis and stem
decay
Skin lesions
Colletotrichum coccodes
(Wallr.) S.J. Hughes =
Colletotrichum atramentarium
(Berk. & Broome)
Taubenhaus
Black dot
Worldwide
Stem lesions may be
associated with Potato
Early Die Syndrome
Superficial skin lesions
Erysiphe cichoracearum
Powdery mildew
Arid regions
Late-season, white foliar
pustules on leaflets
Fusarium
spp.
Dry rot;
Fusarium solani
,
Fusarium
sambucinum
,
Fusarium
avenaceum
,
Fusarium
oxysporum
,
Fusarium culmorum
,
Fusarium coeruleum
,
Fusarium
acuminatum
,
Fusarium gramin-
erum
,
Fusarium cerealis
,
Fusarium equiseti
,
Fusarium
crookwellense
Worldwide
Non-emergence and wilt
Seed rot and general
tuber rot
