How to Control Fruit Rot in Chilli?

Understanding Fruit Rot and Its Causes

Fruit rot can appear in different forms, but anthracnose and Phytophthora blight are the most common and damaging. Recognizing the symptoms helps in early intervention:

• Anthracnose: This typically appears as sunken, circular, dark lesions on ripening or mature fruits. Often, these lesions show concentric rings, and under humid conditions, pinkish spore masses may be visible in the center. It can also affect leaves and stems.
• Phytophthora Blight: This causes rapidly expanding, water-soaked lesions on fruits, stems, and leaves, leading to a soft rot. It thrives in waterlogged or poorly drained soils and high humidity.

Both diseases are favored by high humidity, warm temperatures (25-30°C), and prolonged periods of leaf wetness, often exacerbated by heavy rainfall or overhead irrigation.

Cultural Practices for Prevention

Good farm management practices are the first line of defense against fruit rot:

• Crop Rotation: Avoid planting chilli or other related solanaceous crops (like tomato, brinjal, potato) in the same field for at least 2-3 years. This breaks the disease cycle.
• Field Sanitation: Regularly remove and destroy all infected plant debris, fallen fruits, and weeds from the field. This significantly reduces the source of disease inoculum.
• Proper Spacing: Maintain adequate plant spacing (e.g., 60 cm between rows and 45 cm between plants) to ensure good air circulation. This helps reduce humidity around the plants, making conditions less favorable for fungal growth.
• Irrigation Management: If possible, use drip irrigation to avoid wetting the foliage. If using flood or furrow irrigation, do it in the morning so that leaves and fruits can dry quickly in the sun. Ensure proper drainage to prevent waterlogging.
• Nutrient Management: Provide balanced nutrition to your chilli plants. Avoid excessive application of nitrogen, which can lead to lush, soft growth that is more susceptible to disease. Adequate potassium and calcium can improve fruit firmness and overall plant resistance.
• Seed Treatment: Always use certified, disease-free seeds. Treating seeds with recommended fungicides before planting can protect seedlings from early infections.

Chemical Control Measures

Fungicides are crucial for managing fruit rot, especially during the fruiting stage and in periods of high humidity or rainfall. Preventive sprays are often more effective than curative ones.

• Preventive Sprays: Start spraying before the disease appears, particularly if weather conditions are favorable for its development.
• Systemic and Contact Fungicides: A combination or rotation of different types of fungicides (contact and systemic) is often recommended to provide broad-spectrum protection and prevent the development of fungicide resistance.
• Application: Ensure thorough coverage of all fruits and foliage. Repeat sprays at recommended intervals, usually every 7-10 days, depending on the fungicide and disease pressure.

Fungicide	Dosage (per 15L water)	Application Timing
Mancozeb (75% WP)	30-40 g	Preventive, early stages
Carbendazim (50% WP)	15-20 g	Early stages, systemic action
Copper Oxychloride (50% WP)	40-50 g	Preventive, contact action
Azoxystrobin + Difenoconazole	15-20 ml	Advanced stages, broad spectrum

Always follow the manufacturer's instructions for dosage, mixing, and safety precautions. Rotate fungicides with different modes of action to prevent pathogens from developing resistance.

Resistant Varieties

Choosing chilli varieties that are naturally resistant or tolerant to common fruit rot pathogens is a highly effective and sustainable long-term strategy. Consult your local agricultural extension services or seed suppliers for recommended resistant varieties that are suitable for your specific region and climate.

Integrated Disease Management (IDM) for Best Results

The most effective way to control fruit rot in chilli is to adopt an Integrated Disease Management (IDM) approach. This involves combining all available and appropriate methods in a strategic manner. Start with selecting resistant varieties and implementing good cultural practices. Regularly monitor your crop for any early signs of the disease. If symptoms appear or conditions become favorable, apply fungicides preventively or at the first sign of symptoms, strictly following recommended dosages and rotation schedules. Timely harvesting of mature fruits also helps reduce the chances of them rotting on the plant.

Managing fruit rot in chilli requires a proactive and integrated approach. By combining good sanitation, proper cultural practices, selecting resistant varieties, and judicious use of fungicides, farmers can significantly reduce disease incidence, minimize losses, and protect their valuable chilli yields.