Radish (Raphanus sativus)
Black leg(Phoma lingum)
Symptoms
- Pale, irregular spots develop on leaves, which later become ashy gray with scattered black dots on the surface.
- Stem lesions are elongated with purple borders near the ground level and extend below the soil surface, causing a black rot of lower stem and roots.
- Severely affected plants remain stunted and finally wilt.
- As plants mature, they fall due to lack of root anchorage.
Management
- Disease free seeds should be used for planting.
- As the main infection is through seeds, hot water treatment of seeds for 52 degree Celcius for 15 minutes is recommended.
- For seed production plots, seed stock used should be free from fungal pathogen.
- Cultivation in the fields where crucifers have been continuously grown during last 2 years should be avoided.
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 | Copper hydroxide 77 WP | HiDice, Kocide 101 | Blue | 1 g/ litre of water | 10 g | 200 g | 500 g | Drench 2 weeks before planting |
| 2 | Copper oxychloride 50 WP | Bensaan, Blitox, Blue copper, Bluetrox, Copter, Cupramar, Cuprina, Dhanucop, Fytolan, Fytox, Fytran, Fytolan, Hilcopper, Killex copper, Maincop Dhanucop, Star cop, Tagcop, Trucop | Blue | 2 g/ litre of water | 20 g | 400 g | 1000 g | Drench 2 weeks before planting |
Extremely Toxic
Highly Toxic
Moderately Toxic
