Sorghum (Sorghum bicolor)
Downy Mildew ( C.O: Peronosclerospora sorghi )
Symptoms
- The symptom of the disease is characterized by yellowish patches on the leaves.
- Profuse downy white growth consisting of conidiophores and conidia is produced on the lower surface of the leaves.
- Normally seedlings or 3-4 leaves stage develop the chlorotic downy growth.
- Subsequent leaves show progressively more of a complete bleaching of the leaf tissue in streaks or stripes.
- As the infected bleached leaves mature they become necrotic and the interveinal tissues disintegrate, releasing the resting spores (oospores) and leaving the vascular bundles loosely connected to give the typical shredded leaf symptom.
Management
- Follow crop rotation with pulses and oilseeds.
- Rogue out the infected plants up to 45 days of sowing.
Chemical Control
| Sl.No | Generic Name | Trade Name | Color code | Dosage/litre | Knapsack Sprayer (Capacity 10L) | Dosage/acre (200 L) | Dosage/hectare (500 L) |
|---|---|---|---|---|---|---|---|
| 1 | Potassium phosphonate 40 SC | Akomin | Green | 4 ml /1 litre of water | 40 ml | 800 ml | 2000 ml |
| 2 | Mancozeb 75 WP | Devidayal M-45, Dhanuka M-45 Dithane , Dithane M-45 , Hilthane Hindustan M-45 , Indofil M-45,Izeb M-45 , Manzate , Luzen 45 ,Macoban M-45, Mancosaan , Mancosaan M-45 Manzeb 75 WP , Maneb Manzane M-Guard , Savour M-45 , Tata M-45 Eurofil -NT , Uthane M-45 ,Veera Zinthane | Green | 3 g/litre of water | 30 g | 600 g | 1500 g |
| 3 | Metalaxyl + mancozeb 72 WP | Tagmill | Blue | 2 gram/ 1litre of water | 20 g | 400 g | 1000 g |
Extremely Toxic
Highly Toxic
Moderately Toxic
