Sweet Potato (Ipomoea batatas)
Soft rot/ Rhizopus rot (Rhizopus stolonifer)
Symptoms
- This is a post harvest disease of sweet potato and cause reduction in quality of tubers
- Symptoms appear as water soaking followed by softening of tissues
- The rotten tissues emit a fermented smell
- Fluffy mycelium, sporangiophores and sporangia of the fungus emerge out from the affected tissues
Management
- Avoiding injuries to tubers during harvest and careful post harvest handling to prevent infection.
- Storage in deep pits with alternate layer of leaves, sawdust and soil is effective.
- Dipping seed tubers in mancozeb or copper oxychloride 0.2% can arrest the disease development.
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 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 | 2 g | 20 g | 400 g | 1000 g | Dipping the tubers in solution |
| 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 | 2.5 g | 25 g | 500 g | 1250 g | Dipping the tubers in solution |
Extremely Toxic
Highly Toxic
Moderately Toxic
