Management Late blight in Potato
- Late blight is the major disease in Potato crop.
- This disease is caused by a fungus called Phytophthora infestans.
- This disease damages leaves, stems and tubers. The disease first appears as water soaked, light brown lesions on the leaf blade.
- The lesions turn dark brown, dry and brittle after the infected leaf tissues die. In humid atmosphere, the growth of the fungus can be seen on lower side of these spots as whitish cottony growth.
- The spots turn black as the affected leaves start rotting. Severe infections cause all foliage to rot, dry out and fall to the ground, stems to dry out and plants to die.
- The tubers under the ground also decay before harvest. On tubers, greenish sunken areas may be seen.
- To control Late blight of potato, spraying of Mancozeb 75% WP@ 50 Gm/ 15 litre water or Copper oxychloride 50% WP @ 50 Gm/15 litre water or Metalaxy + Mancozeb @ 50 Gm/ 15 Litre water should be done.
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