Breda de Haan, (1896)
Phytophthora nicotianae a plant pathogen infecting many hosts including onion and strawberries.
Disease of onion
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.
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