This blog will explore the causes, symptoms, favorable factors, and management strategies for bacterial leaf blight, offering insights on safeguarding your rice fields from this destructive disease.
What is Bacterial Leaf Blight?
Bacterial leaf blight is a common plant disease that affects a wide variety of plants, including vegetables, fruits, and ornamentals. It is caused by bacteria that enter the plant through its leaves, stems, or flowers. The bacteria then multiply and spread throughout the plant, causing damage to the leaves, stems, and fruits. Bacterial leaf blight, caused by the bacterium Xanthomonas oryzae pv. Oryza is a major concern for paddy farmers worldwide. It can significantly reduce yield and grain quality, impacting livelihoods and food security.
Overview of bacterial leaf blight infestation
|
Type of infestation |
Bacterial Disease |
|
Common Name |
Bacterial leaf blight |
|
Causal organism |
Xanthomonas oryzae pv.oryzae |
|
Affected parts of the plant |
Leaf |
Favourable factors for Bacterial leaf blight in paddy crop:
- Temperature: Warm temperatures between 25-34°C (77-93°F) are optimal for bacterial growth and disease development.
- Humidity: High relative humidity above 70% promotes the spread of bacteria through water droplets on leaves.
Symptoms of Bacterial leaf blight in paddy crop:
- Water-soaked streaks: Look for elongated, water-soaked streaks appearing on leaf tips or margins, often starting from wounds or natural openings. These streaks may have a wavy edge and gradually enlarge.
- Yellowing and drying: As the disease progresses, the streaks turn yellowish or orange, eventually drying out and becoming necrotic (dead tissue). The leaves may curl, wilt, and die, starting from the tips and progressing downwards.
- Milky ooze: In the early stages, you might observe tiny, milky droplets of bacterial ooze on the underside of young lesions, particularly early in the morning. This ooze dries into yellowish beads later.
- Kresek in seedlings: In young seedlings, the infection can cause a rapid wilting and death of the entire plant, known as "kresek."
Measures to Control Bacterial leaf blight in paddy:
Cultural method of control for Bacterial leaf blight in paddy
- Burn the stubbles
- Avoid flooded condition
- Remove weed host periodically
Chemical method of control for Bacterial leaf blight in paddy
Spray Streptomycin sulfate and tetracycline combination 50g + Copper oxychloride 200 g/ac. or Copper hydroxide 500 g/ac
|
Products |
Technical Names |
Dosages |
|
Copper oxychloride 50 % wp |
2gm/ltr |
|
|
Streptomycin Sulphate 90% + Tetracycline Hydrochloride 10% |
6-12 gm in 60 L water |
|
|
Metalaxyl-M 3.3% + Chlorothalonil 33.1% SC |
300-400 ml/acre |
|
|
Mix 1kg in 50litres |
FAQs related to Bacterial Leaf Blight in Paddy :
Q. What is bacterial leaf blight in paddy?
A. Bacterial leaf blight is a deadly bacterial disease that affects leaf of paddy crop and is among the most destructive disease in cultivated paddy rice
Q. What are the symptoms of bacterial leaf blight in leaves?
A. Symptoms of common bacterial blight first appear on leaves as small, water-soaked spots, light green areas, or both .
Q. Which treatment is considered best for bacterial leaf blight in paddy ?
A. Spraying streptomycin (Katyayani KMYCIN) and copper oxychloride(Katyayani COC50) is considered best for the management of bacterial leaf blight in paddy
