Pod scab nematode (Kalahasti malady): Tylenchorhynchus brevilineatus

Symptoms

• Infested plants appear in patches in the field and stunted with pale green 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 (33 kg/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