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 nematode: Rotylenchulus 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