Cucumber (Cucumis sativus)
Downy mildew (Pseudoperonospora cubensis )
Symptoms
- The primary symptoms are pale yellow angular spots on the upper surface of the leaves.
- White/ yellow/ orange fungal growth appears on the lower surface of the leaves, under conditions of high humidity.
- The disease spreads rapidly killing the plant quickly through rapid drying of leaves and defoliation.
- It is prevalent in areas of high humidity, especially when summer rains occur regularly.
Management
- Destruction of plant debris of previous crop.
- Maintain proper plant density.
- Remove and destroy severely infected and dried leaves.
- Use tolerant varieties
- Avoid overhead irrigation, water plants from base.
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 | Potassium phosphonate 40 SC | Akomin | Green | 4 ml | 40 ml | 800 ml | 2000 ml | |
| 2 | 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 gm/litre | 30 g | 600 g | 1500 g | |
Extremely Toxic
Highly Toxic
Moderately Toxic
