Disease - Root rot
Causal organism - Rhizoctonia solani and Fusarium solani
Symptoms - The symptoms can be caused by soil-borne fungal pathogens & can infect plants at any stages of development.
This disease affects mainly the roots. This disease appears late on lentil plants.
Diseased plants appear in pieces in the field and the leaves turn yellow and the plants dry up.
The root becomes black in colour & then rotten and on uprooting, most plants are broken and the roots remain in the ground. On seeing the plant uprooted, the stem looks like fungus wrapped in the form of cotton.
The fungus looks like the cotton wrapped up on the stem
Due to root rot disease in lentil crop, the plant starts to dry after 20-25 days of sowing.
Control - For control of seed borne diseases, sowing should be done after treated with thiram 75 % & carbendazim 50 % (2:1) 3 g or Trichoderma 4 grams @ per kg of seeds.
For the control of soil-borne and seed-borne diseases, bio fungicide Trichoderma viridi 1 % WP or Trichoderma harzianum 2 % WP 2.5 kg per hectare mixed with 60-75 kg of rotten dung compost by giving light water & spray after keeping it under shade for 8-10 days, adding it to the field at the last ploughing before sowing.
Integrated Disease Management -
- Deep ploughing should be done in summer.
- Use balanced fertilizers and manures.
- For the control of root rot disease, lentil crop should not be taken for 3-4 years in the field where it is often spread.