- Type of Infestation: Disease
- Common Name: Alternaria Blight
- Causal Organism: Alternaria helianthi
- Affected Parts Of the plant: Leaves, Fruit and Stem
- Warm temperatures (25-30°C)
- Extended periods of leaf wetness (over 12 hours)
- High humidity
- Dense planting
- Dark brown to black, circular to oval spots ranging from 0.2 to 5 cm in diameter on leaves, stems, and even flower parts (especially ray florets).
- Yellow halo surrounding the spots
- Concentric rings within the necrotic center of the spots
- Lesions that may merge and cause blight (widespread death of plant tissue)
- Defoliation (leaf drop) starting from the lower leaves and progressing upwards
| Products | Technical Names | Dosages |
| Samartha | Carbendazim 12 % + Mancozeb 63 % WP | 300-400 grams per acre |
| Dr Blight | Metalaxyl-M 3.3% + Chlorothalonil 33.1% SC | 300-400 ml/acre |
| BOOST | Propiconazole 25 % EC | 200- 300 ml per acre |
| PRODIZOLE | Propiconazole 13.9 % + Difenoconazole 13.9 % EC | 1 - 1.5 ml per 1 liter of water. |
| Propi | Propineb 70% WP | 600 - 800 grams per Acre |
