Onion (Allium cepa L.)
Stemphylium blight (Stemphylium vesicarium)
Symptoms
- This disease is very common on leaves and flower stalks.
- Infection occurs on radial leaves of transplanted seedlings at 3- 4 leaf stage during late March and early April.
- The symptoms appear as small yellowish to orange flecks or streaks in the middle of the leaves, which soon develop into elongated spindle shaped spots surrounded by pinkish margin.
- The disease appearing on the inflorescence stalk causes severe damage to the seed crop.
Management
- Field sanitation
- Removal and burning of crop residues
- Follow long rotations with non-host crops.
- Follow proper field drainage and reduce plant density.
- Hot water soaking of garlic seed (50 °C for 20 minutes).
Chemical Control
| Sl.No | Generic Name | Trade Name | Color code | Dosage/litre | Knapsack Sprayer (Capacity 10L) | Recommendation | Remarks | |
|---|---|---|---|---|---|---|---|---|
| Dosage/acre (200 L) | Dosage/hectare (500 L) | |||||||
| 1 | Mancozeb 75 WP | Devidayal M-45, Dhanuka M 45, Dhanuka M-45, Dithane, Dithane M-45, Hilthane, Hindustan M 45, Indofil M 45, Izeb M-45 Manzate, Luzen-45, Macoban, Macoban M-45, Mancosaan, Mancosaan M-45, 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 | - |
| 2 | Carbendazim 50 WP | Bavistin, Benfil, Bengard, Benlate, Benmain, Bensaan, Carben, Carziim50, Dhanustin, Dhanustin 50 WP, Fungiguard, Gancarzin50, Glizim, Mintho, Tagstin, Tiara, Zoom | Green | 1 g/ litre of water | 10 g | 200 g | 500 g | - |
Extremely Toxic
Highly Toxic
Moderately Toxic
