''Phytophthora pluvialis'' is a semi-
papillate
This glossary of botanical terms is a list of definitions of terms and concepts relevant to botany and plants in general. Terms of plant morphology are included here as well as at the more specific Glossary of plant morphology and Glossary o ...
plant
pathogen
In biology, a pathogen ( el, πάθος, "suffering", "passion" and , "producer of") in the oldest and broadest sense, is any organism or agent that can produce disease. A pathogen may also be referred to as an infectious agent, or simply a germ ...
that mainly infects
tanoak-
Douglas-fir forests of western
Oregon
Oregon () is a U.S. state, state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington (state), Washington, while the Snake River delineates much of it ...
.
It was reported in
Cornwall
Cornwall (; kw, Kernow ) is a historic county and ceremonial county in South West England. It is recognised as one of the Celtic nations, and is the homeland of the Cornish people. Cornwall is bordered to the north and west by the Atlantic ...
. UK, in October 2021; the first record for Europe.
Description
''Phytophthora pluvialis'' is
homothallic; it forms
oogonia
An oogonium (plural oogonia) is a small diploid cell which, upon maturation, forms a primordial follicle in a female fetus or the female (haploid or diploid) gametangium of certain thallophytes.
In the mammalian fetus
Oogonia are formed in larg ...
in culture. Its oogonia are terminal, smooth and globose, being approximately 30
µm
The micrometre ( international spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is a unit of length in the International System of Unit ...
in diameter, and possess
amphigynous antheridia. Its
oospores are globose and
aplerotic, being about 28 µm in diameter.
Sporangia
A sporangium (; from Late Latin, ) is an enclosure in which spores are formed. It can be composed of a single cell or can be multicellular. Virtually all plants, fungi, and many other lineages form sporangia at some point in their life cy ...
formed in water are ovoid and slightly irregular, semi-
papillate
This glossary of botanical terms is a list of definitions of terms and concepts relevant to botany and plants in general. Terms of plant morphology are included here as well as at the more specific Glossary of plant morphology and Glossary o ...
, terminal or
subterminal, and partially
caducous with medium-sized
pedicel
Pedicle or pedicel may refer to:
Human anatomy
*Pedicle of vertebral arch, the segment between the transverse process and the vertebral body, and is often used as a radiographic marker and entry point in vertebroplasty and kyphoplasty procedures
...
s.
References
Further reading
*Dick, Margaret Anne, et al. "Pathogenicity of ''Phytophthora pluvialis'' to ''Pinus radiata'' and its relation with red needle cast disease in New Zealand." New Zealand Journal of Forestry Science 44.6 (2014).
*Hood, Ian A., et al. "Decline in vitality of propagules of ''Phytophthora pluvialis'' and ''Phytophthora kernoviae'' and their inability to contaminate or colonise bark and sapwood of ''Pinus radiata'' log segments." New Zealand Journal of Forestry Science 44.1 (2014): 7.
*Rolando, Carol, et al. "The use of adjuvants to improve uptake of phosphorous acid applied to ''Pinus radiata'' needles for control of foliar ''Phytophthora'' diseases." New Zealand Journal of Forestry Science 44.1 (2014): 1–7.
External links
*
pluvialis
'' Pluvialis '' is a genus of plovers, a group of wading birds comprising four species that breed in the temperate or Arctic Northern Hemisphere.
In breeding plumage, they all have largely black underparts, and golden or silvery upperparts. The ...
Water mould plant pathogens and diseases
Tree diseases
{{plant-disease-stub