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 (ihyk ekstsd ;g jksx Qly dh fdlh Hkh voLFkk esa izjaHk gks ldrk gS A ifRr;ksa ij xgjs ihys jax ds /kCcksa curs gSa ckn es lHkh iRrs ihys iM+ tkrs gSa A ;g jksx lQsn e[[kh }kjk QSyrk gS

Flower & pod production reduced. Seed size reduced Symptoms of YMV Yellow specks on young leaves Yellow mottle Maturity is delayed Flower & pod production reduced. Seed size reduced Irregular yellow & green patches & sight puckering & reduced leaf size

Characteristic of MYMV

Yield loss due to YMV Infection before flowering 75% At the time of flowering 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 (jkbtksDVksfu;k vaxekjh nks ekg dh Qly esa ;g jksx fn[kkbZ ns ldrk gS A fupyh ifRr;ksa ls ;g jksx vkjHk gksrk gS A ifRr;ksa ij dRFks jax ds /kCcs cuus yxrs gS vkSj ifRr;ksa fxjus yxrh gSaA jksxk.kq Ckht vkSj Hkwfe ij thfor jgrk gS A 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 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

Spray of insecticides like imidaclorprid or thiomethoxam 1ml/litre 5. Observe the field periodically and rough out the YMV infected plants 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 % Sprays to be repeated after 15 days.