''Phytophthora cryptogea'' is a species of
water mould in the family
Pythiaceae. It is a
plant pathogen
Plant pathology (also phytopathology) is the scientific study of diseases in plants caused by pathogens (infectious organisms) and environmental conditions (physiological factors). Organisms that cause infectious disease include fungi, oomyc ...
that infects several species of cultivated plants, including over 40 species of cultivated flowers.
[Olson, H. A., et al. (2011)]
Phylogenetic history of ''Phytophthora cryptogea'' and ''P. drechsleri'' isolates from floriculture crops in North Carolina greenhouses.
''Phytopathology'' 101(11) 1373-84. It was first described as the cause of tomato foot rot in tomatoes
Host Range and Symptoms
This species is reported to be pathogenic on
grandiflora petunia (''Petunia'' × ''atkinsiana''). It causes root rot, shoot rot and shanking in
tulips. It also infects blue daze (''
Evolvulus glomeratus
''Evolvulus glomeratus'', commonly known as blue daze, Brazilian dwarf morning-glory, or Hawaiian blue eyes, is flowering plant from the family Convolvulaceae that is native to Brazil, Guyana, Bolivia and Venezuela.
Description
It is an evergree ...
''), dusty miller (''
Jacobaea maritima
''Jacobaea maritima'', commonly known as silver ragwort, is a perennial plant species in the genus ''Jacobaea'' in the family Asteraceae, native to the Mediterranean region. It was formerly placed in the genus ''Senecio'', and is still widely ref ...
''), Barberton daisy (''
Gerbera jamesonii
''Gerbera jamesonii'' is a species of flowering plant in the genus ''Gerbera'' belonging to the basal Mutisieae tribe within the large Asteraceae (or Compositae) family. It is indigenous to South Eastern Africa and commonly known as the Barberton ...
''), and garden
verbena
''Verbena'' (), also known as vervain or verveine, is a genus in the family Verbenaceae. It contains about 150 species of annual and perennial herbaceous or semi-woody flowering plants. The majority of the species are native to the Americas a ...
(
''Verbena'' × ''hybrida'').
Like its relative ''
Phytophtora cambivora'', it can cause ink disease of
chestnuts (''Castanea sativa'').
The species is a cause of foot rot in tomatoes, causing discoloration and lesion in the stem. Progression of lesions leads to girdling, root system rot and plant collapse. Foliage will not be affected until plant stem has become girdled.
Life Cycle
P. cryptogea are prolific in wet, waterlogged soil and can persist for long periods of time in soil on organic matter. It reproduces asexually through sporangiophores and accompanying non-papillate sporangia in liquid media as well as by uneven, irregular hyphal growth.
It does not produce chlamydospores.
Sexual reproduction is heterothallic, typically requiring an opposite mating type but sometimes occurring in aged single cultures.
Sexual structures produced are antheridia and oogonia that fill with oospores.
Species Differentiation
This and ''
Phytophthora drechsleri
''Phytophthora drechsleri'' is a plant pathogen with many hosts.
Affected plants
See:
* List of potato diseases
* List of maize diseases
* List of almond diseases
* List of apricot diseases
* List of beet diseases
* List of caneberries disea ...
'' have been considered the same species, but
phylogenetic analysis has revealed that they are two distinct species.
[Mostowfizadeh-Ghalamfarsa, R., et al. (2010)]
Phylogenetic relationship of ''Phytophthora cryptogea'' Pethybr. & Laff and ''P. drechsleri'' Tucker.
''Fungal Biology'' 114(4) 325-39.
References
External links
''Phytophthora cryptogea''.Index Fungorum.
cryptogea
Water mould plant pathogens and diseases
Tomato diseases
{{plant-disease-stub