Prevention of late blight disease in potato crop

  • It affects leaves, stems and tubers. 

  • In this disease, irregularly shaped water-soaked spots are formed on the leaves, which causes the early fall of leaves. Due to these spots, a brown layer is formed on the leaves which affects the photosynthesis process of the plant.

  • As the process of photosynthesis is affected, the plants are unable to produce food, stunting the plant’s growth and the plant dries prematurely.

  • White growth develops under the surface of the leaves, on the stem and nodes, at these points, the stem breaks and the plant falls. In tubers, purplish-brown spots spread over the entire surface when cut, and rusty brown necrosis appears from the affected tuber surface to the centre.

  • Chemical Treatment:- Azoxystrobin 11% + Tebuconazole 18.3% SC @ 300 ml or Kasugamycin 5% + Copper Oxychloride 45% WP @ 300 g or Tebuconazole 10% + Sulfur 65% WG @ 500 g or Metalaxyl 4% + Mancozeb 64%WP @ Spray 600 gm or Tebuconazole 50% + Trifloxystrobin 25% wg @ 150 ml per acre.

  • Biological treatment:- Use Pseudomonas fluorescens @ 250 gm/acre.

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