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صدأ الورد

agroland-eg

1 أبريل, 2020

صدأ الورد

المسبب: Phragmidium mucronatum

يكون الفطر بثرات تليليتية سوداء داكنة تحتوي بداخلها على جراثيم تيليتية معنقة تتكون من 6 خلايا مع وجود شوكة طرفية (نتوء مستدق في قمة الجرثومة) ويصل طول الجرثومة 31 ميكرون وعرضها 5 و 2 ميكرون أي أن مقياس الجرثومة يصل 77ميكرون. وتنتشر الجراثيم التيليتية بواسطة الرياح وغالبا ما

تحدث الإصابة في فصل الخريف عند درجات حرار 18-21م.

الأعراض:

يظهر على السطح العلوي للورقة بقع صفراء بنية اللون يقابلها على السطح السفلي بثرات حمراء بنية اللون، وتتكشف بثرات تيليتية سوداء اللون شكل ادناه في نهاية الخريف..

جراثيم تيليتية الأعراض على السطح العلو للورقة

شكل يبين الأعراض على أوراق الورد وجراثيم الفطر التيليتية

المكافحة:

رش النباتات المصابة بمبيد دياثين م 45 بمعدل 5 و 2 جم / لتر ماء.

المصدر

يونس يوسف مولان وصلاح الدين الحسيني محمد وياسر عيد إبراهيم (2008) تشخيص الأمراض الفطرية وطرق مكافحتها.

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