Bacterial leaf spot (BLS) is a common and destructive disease of chilli peppers caused by the bacterium Xanthomonas euvesicatoria. It can cause significant yield losses, especially under favorable conditions. It is caused by bacteria that enter the plant through natural openings or wounds in the leaves. Once inside, the bacteria multiply and spread, causing the leaves to wilt, turn brown, and die.
- Type of Infestation: Bacterial Disease
- Common Name: Bacterial leaf spot
- Causal Organism: Xanthomonas campestris pv. vesicatoria
- Affected Parts Of the plant: Leaves
Environmental favorable factors for Bacterial leaf spot in Chilli:
- Temperature: The bacterium thrives in warm temperatures, with optimal growth occurring between 25-30°C (77-86°F).
- Humidity: Moist conditions, including frequent rain, fog, or overhead irrigation, promote bacterial growth and spread. Relative humidity above 85% is ideal for infection.
Symptoms of Bacterial leaf spot in Chilli:
- Small, water-soaked spots on the leaves, which may enlarge and turn brown or black
- Yellow halos around the spots
- The spots may become raised or scabby
- Leaves may wilt, curl, or drop prematurely
- In some cases, the fruit may also be affected, developing spots, blemishes, or even rotting.
Measures to control Bacterial leaf spot in Chilli:
|
Products |
Technical Names |
Dosages |
|
Thiophanate Methyl 70% WP |
250-600gm/Acre |
|
|
Copper oxychloride 50 % wp |
2gm/ltr |
|
| KMYCIN | Sulphate |
6-12 gm in 60 L water |
Frequently Asked Questions:
Q. What is bacterial leaf spot of chilli?
A. Bacterial leaf spot is a disease caused by Xanthomonas euvesicatoria, leading to wilting and brown spots on leaves.
Q. What are the symptoms of chilli leaf spot?
A. Symptoms include small, water-soaked spots that enlarge, yellow halos, and wilting leaves. In severe cases, fruit can also develop blemishes.
Q. How to treat bacterial leaf spot in chilli?
A. Effective treatments include Thiophanate Methyl and Copper Oxychloride. Apply according to the recommended dosages for best results.
Q. What causes bacterial leaf spot in chilli?
A. The disease is caused by bacteria entering the plant through natural openings or wounds, thriving in warm and humid conditions.
Q. How to manage bacterial leaf spot in chilli?
A. Implement crop rotation, use disease-resistant varieties, and maintain proper irrigation practices to reduce moisture on leaves.
Q. What is the causal organism of bacterial leaf spot in chilli?
A. Bacterial leaf spot (BLS) in chilli is caused by multiple Xanthomonas biotypes, primarily Xanthomonas euvesicatoria pv. euvesicatoria.
