Castor: Phytophthora blight and Bacterial blight

Castor (अरंडी): Phytophthora blight and Bacterial blight

1. Seedling blight (अंकुर झुलसा):- Phytophthora parasitica

Symptoms (लक्षण):-

- The disease appears as circular, dull green patch on both the surface of the cotyledonary leaves. It later spreads and causes rotting. 

(रोग की शुरुआत बीजपत्री पत्तियों की दोनों सतहों पर गोल, धूमिल हरे धब्बों के रूप में होती है। यह बाद में फैलता है और सड़न का कारण बनता है।)

- Under humid conditions, infection spreads to stem and causes withering and death of seedling due to destruction of growing tip. 

(आर्द्र परिस्थितियों में, संक्रमण तने तक फैल जाता है और वृद्धि कर रहे शीर्ष के नष्ट होने के कारण अंकुर के मुरझाने और मरने का कारण बनता है।)

- In mature plants, the infection initially appears on the young leaves and spreads to petiole and stem causing black discoloration and severe defoliation. 

(परिपक्व पौधों में, संक्रमण पहले तरुण पत्तियों पर दिखाई देता है और डंठल और तने तक फैल जाता है, जिससे काले रंग में परिवर्तन और गंभीर पर्णपात होता है।)

- On older leaves, spots are round to irregular and show alternate yellow and brown concentric zones with yellowish green halo on the upper surface. 

(पुरानी पत्तियों पर धब्बे गोल से अनियमित होते हैं और ऊपरी सतह पर पीले-हरे घेरे के साथ पीले और भूरे रंग के एकांतरित संकेंद्री क्षेत्र दिखाते हैं।)

- Affected leaves are blighted and shed prematurely.

(प्रभावित पत्तियाँ मुरझा जाती हैं और समय से पहले गिर जाती हैं।)

- Under moist conditions, a whitish fungal growth is found on the under surface of the spots.

(आर्द्र परिस्थितियों में, धब्बों की निचली सतह पर सफेद कवकीय वृद्धि पाई जाती है।)

Etiology (रोगजनन):-

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