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Nematode pest of crops : Oilseeds


Pod Scab nematode Kalahasti malady : Tylenchorhynchus brevilineatus

Symptoms

  • Infected plants appear in patches in the field and stunted with pale greener than normal foliage.
  • Small, brownish lesions appear on the pegs, and on young developing pods.
  • Small, brownish lesions appear on the pegs, and on young developing pods.
  • In advanced stage, entire pod surfaces become blackened.
  • Discolouration can also be observed on roots.

Management

  • Grow resistant varieties
  • Crop rotation with rice
  • Irrigate the field.
  • Apply carbofuran 3G @ 1.0 kg a.i/ha 25 -30 days after sowing along with irrigation water.
  • Application of gypsum @ 200 kg/ha at the time of earthingup.

Crop Rotation: 

  • Tagetes erecta was a poor host for T. brevilineatus.  As a rotation crop, it reduced nematode populations in soil and pod disease severity and increased groundnut pod yield. 
  • Mustard also significantly increased pod yield (Naidu et al, 2000b).

Castor

Reniform nematodeRotylenchulus reniformis

Symptoms:

  • Above ground symptoms on host plants include dwarfing, shedding of leaves, formation of malformed fruit and seeds, and general symptoms of an impaired root system.
  • Below ground, roots are discolored and necrotic (dead) with areas of decay. Plant mortality is possible in heavy infestations.

Management

  • Application of carbofuran 3 G @ 1.0kg a.i/ha
  • Rotation of soybeans with corn, sorghum, and wheat reduced populations of reniform nematode.
  • Application of FYM @ 10 t/ha or neemcake @ 500 kg/ha

 

 


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