Phytophthora nicotianae

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Phytophthora nicotianae
Scientific classification
Kingdom: Chromalveolata
Phylum: Oomycota
Class: Oomycetes
Subclass: Incertae sedis
Order: Pythiales
Family: Pythiaceae
Genus: Phytophthora
Species: P. nicotianae
Binomial name
Phytophthora nicotianae
Breda de Haan, (1896)

Blepharospora terrestris
Phloeophthora nicotianae
Phytophthora allii
Phytophthora formosana
Phytophthora imperfecta var. nicotianae
Phytophthora lycopersici
Phytophthora manoana
Phytophthora melongenae
Phytophthora nicotianae var. parasitica
Phytophthora parasitica
Phytophthora parasitica var. nicotianae
Phytophthora parasitica var. piperina
Phytophthora parasitica var. rhei
Phytophthora ricini
Phytophthora tabaci
Phytophthora terrestris

Phytophthora nicotianae a plant pathogen infecting many hosts including onion and strawberries.

Disease of onion[edit]

On Allium cepa it causes the disease known as phytophthora neck and bulb rot. Susceptible onion plants that are infected with this pathogen could easily die. Host resistance has been identified in short, mid-, and long day onions.

Different stages of onion may be affected. Initially, tips of newly infected plants start yellow and dry followed by softening of the "neck" of the plans that eventually fall over. Infected leaves may show grey leaf lesions.

Conditions that promote the development of this disease are warm and wet conditions.

Use of resistant varieties is probably the best mode of control. Application of fungicide may reduce crop loss cause by Phytophthora neck and bulb rot. Irrigation, recirculation of water irrigation, flooding, and run-off could exacerbate the problem.

External links[edit]