Downy mildew disease of onion || प्याज के डाउनी फफूंदी रोग की पहचान और प्रबंधन कैसे करें ||

Описание: Onion downy mildew is caused by the fungus-like (Oomycete) organism Peronospora destructor, which infects first the leaves and later bulbs of onions and shallots in mild, humid weather in late spring and summer. Some perennial onions such as chives may also be infected
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It is worse in cool wet seasons and in wet areas. Closely spaced crops such as salad or spring onions are especially vulnerable.
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Symptoms:
The affected leaves turn yellow and die off from the tip downwards
In moist conditions a white, and later purplish mould develops on affected parts of the leaf
This, in turn, is commonly followed by darker mould growth of other leaf-infecting fungi
Bulbs can also be infected and often sprout prematurely or shrivel in store
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Non-chemical control
Avoid overcrowded crops, damp conditions and sheltered sites and maintain good weed control to ensure airflow through the crop
Do not compost infected material
It is recommended to remove and dispose of affected plants and avoid replanting with onion or shallots for five years
It is important not to allow any bulbs to remain in the soil from year to year. The fungus remains dormant in infected bulbs, producing spores in the spring which spread the disease to newly sown plants
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I am Dr. Ashok Choudhary, Owner of this Channel called Plant Detective.
This channel provides you lecture videos on different topics, videos and shorts on plant propagation, plant diseases and their management, zoological videos, fun facts etc. Here you will find the quality of content which is educational and informative. PPT presentations with explanations, students presentation for developing their confidence and knowledge. I made this channel for students and plant lovers.
I'm Dr. Ashok Choudhary
Scientist (Plant Pathology)
I Completed my Doctorate Degree in Botany specialization with Plant Pathology. Presently I am Scientist/Assistant Professor at State Agriculture University (SAU). I have qualified ASRB-NET (Plant Pathology), IARI Ph.D. Entrance exam, Ph.D. Exam conducted by NAARM, Hyderabad. My dream is to educate a large number of people about plant science through my educational lectures and videos.
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