Transcript Diseases of Soybean Dr. D.R. Saxena R.A.K. College of Agriculture, RVSKVV SEHORE- (M.P.)

Diseases of Soybean
Dr. D.R. Saxena
R.A.K. College of Agriculture, RVSKVV
SEHORE- (M.P.)
Yellow mosaic
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Symptoms of YMV
Yellow specks on young leaves
Irregular yellow & green patches
& sight puckering & reduced leaf
size
Flower & pod
production reduced.
Seed size reduced
Maturity
is
delayed
Yellow
mottle
Characteristic of MYMV
Yield loss due to YMV
Infection
before
flowering
At the time
of
flowering
75%
52%
After
flowering
15%
Collar rot – Sclerotium rolfsi
• Mycelial growth on the
collar region of the
plant
• Moderately high
temperature 25 ˚C
• High moisture, crop
canopy, soil reaction,
high organic matter,
etc.
Rhizoctonia areal blight
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Rhizoctonia solani
Charcoal rot Macrophominia phaseolina,
• Infected seedling show
a reddish brown
discoloration from the
soil line up the stem.
• The discolored area
changes from reddish
brown to dark brown or
black.
• Infected tissues, when
split open, look as if
they had been in
charcoal dust.
•
Myrothecium roridum
Brown leaf spot of soybean
• Septoria glycines
• Septoria glycines
Anthraconose
(Colletoricum truncatum)
Integrated Management
1.
Use of resistant/tolerant varieites
For yellow mosaic prone areas select –
PK 1241, PK 1189, PK 1162, PK 1158, Brag/ SL 317& 452, SL
443, SL 450 PK 416, SL 427, PKB 25, SL 457, PK 1042, PK
1135.
2. Seed treatment with Thiram + carboxin (37+37%) 2g/kg,
carbendazim + thiram (1:1) 3g/kg
3. Crop rotation – Soybean should be taken only in kharif
season and rotate with maize, jowar, pigeonpea
4. Use proper dose of fertilizer and specially potassium
Observe the field periodically and rough out the
YMV infected plants
6. Spray of insecticides like imidaclorprid or
thiomethoxam 1ml/litre
7. Spray at initiation of disease or at 35 DAS:
– Carbendazim 50 WP @ -.05 %
or
– Thiophanate methyl 70 WP @ 0.05 %
or
– Copper oxychloride (COC) 50 WP @ 0.2 % or
– Hexaconazole 5 EC @ 0.1 %
5.
Sprays to be repeated after 15 days.