Early Blight of Potato || Symptoms || Etiology || Disease Cycle || Alternaria Solani

Описание: Early Blight of Potato || Symptoms || Etiology || Disease Cycle || Alternaria Solani || Agrarian Amin Lodhi

Identification of Potato Early Blight.
Early Blight of Potato Symptoms And Management.
Difference Between Early Blight and Late Blight of Potato.
Potato Disease.

Early Blight (EB) of potato, caused by Alternaria solani:

Symptoms:

1. Yellowing or bronzing of lower leaves
2. Black or brown spots on leaves, stems, and tubers
3. Lesions may merge, causing defoliation
4. Tubers may develop shallow, dark lesions

Life Cycle:

1. Spores overwinter in infected debris
2. Spores infect lower leaves, spreading upward
3. Disease worsens with moisture, temperature fluctuations

Management:

1. Crop rotation (3-4 years)
2. Sanitation (remove infected debris)
3. Irrigation management (avoid overhead watering)
4. Fungicides (copper, chlorothalonil)
5. Resistant varieties
6. Biological controls (e.g., Trichoderma)

Cultural Controls:

1. Plant high-quality, disease-free seed tubers
2. Maintain optimal soil pH (4.5-7.0)
3. Balance fertilizer applications
4. Avoid excessive nitrogen

Chemical Controls:

1. Fungicide applications (e.g., chlorothalonil, mancozeb)
2. Timing: at planting, 30-40 days after emergence

Resistant Varieties:

1. 'Russet Burbank'
2. 'Shepody'
3. 'Atlantic'

Biological Controls:

1. Trichoderma harzianum
2. Bacillus subtilis
3. Pseudomonas fluorescens

Integrated Pest Management (IPM):

1. Monitor fields regularly
2. Combine cultural, chemical, and biological controls
3. Adjust management strategies based on disease pressure

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