KRISHI VIGYAN KENDRA NAWANSHAH

Krishi Vigyan Kendra (KVK), Jalandhar
KRISHI VIGYAN KENDRA HOSHIARPUR
   
 
Disease of Leaves
Purple Blotch(Alternaria Porri):-
Small water soaked areas developed on the leaves or seed stalks, which turns brown. As the spot enlarge, it becomes zonate and purplish in color with dark purple or red-purple margin and is surrounded by yellow halo. The effected seed stalks break and fall down. The seed on the insected plants are less and shrivelled.
Tentative Disease Period:-
  1. First week of Mar. to 4th week of Apr.(Onion Bulb Crop)
  2. 1st week Ar\pril to 3rd week May(Onion Seed Crop)
  3. 4th week Feb. to 1st week Apr.(GArlic Crop).
Most Favourable disease period: -
4th week Apr. to 1st week May(Onion Purple Blotch)
2nd- 4th week Mar(Garlic Purple Blotch)
Weather Condition of seed diseases development:-
ParticularsRangeMean
Max Air Temp.22-3529 (+/- 2)
Min Air Temp.9-1815 (+/- 2)
Max relative Humidity 60%-90%78% (+/- 2)
Min relative Humidity 25%-60%40% (+/- 2)
S.S.H 4-118% (+/- 2)
RD 2-3
T.RF Drizzle
Presence of mouschere in the form of rain/ dew favour storulatiojn of Pathogen
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KRISHI VIGYAN KENDRA HOSHIARPUR
KRISHI VIGYAN KENDRA HOSHIARPUR

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