مرض في الطماطم(Alternaria)

[amine2009]

Alternaria د ا رسة للفطر

مرض فطري يصيب نباتات الفصيلة . المسبب فطر يحمل ذات الاسم.

يصيب المرض أوراق وسوق وثمار االطماطم وهو واسع الانتشار في الوطن.

هذا هو مرض الندوة المبكرة ( اللفحة المبكرة ) يصيب الفطر اوراق وسيقان النبات في اي طور من اطوار النمو فقد يظهر المرض علي الشتلات والنباتات البالغة وتظهر الاعراض علي الثمار


http://www.extension.umn.edu/gardeninfo/diagnostics/images/tomato/diseases/alternaria1_600px.jpg


ينتشر المرض عند ارتفاع الرطوبة و انخفاض درجة الحرارة و تكون الظروف مناسبة في الايام ذات النهار الدافئ و الليل البارد .
يتطور المرض بسرعة خلال الفترات الدافئة الرطبة محدثا لفحة شديدة للمحصول خلال ايام قليلة .
الاعرا ض :

http://i46.tinypic.com/10ym8ux.jpg

تظهر الأعراض علي الأوراق و السوق و والأفرع و الثمار سواء كانت خضراء أو ناضجة .
وأول الأعراض انحناء عنق الأوراق لأسفل و ظهور بقع كبيرة غير منتظمة علي الأسطح العلوية للورقة و لونها اخضر رمادي مسلوقة المظهر .
البقعة علي الثمرة جافة و كبير و غير منتظمة تظهر كمساحة خضراء بنية شحمية المظهر وغالبا ما تحدث علي النصف العلوي من الثمرة الخضراء كبقعة رمادية مسلوقة و تمتد حتى تعم باقي الثمرة .

صورة با المجهر الضوئى

http://www.uoguelph.ca/%7Egbarron/MISCELLANEOUS/altern3.jpg

المكافحة

مركب سكور 50 سم لكل 100 لتر ماء
أميستار توب 50 سم لكل 100 لتر ماء
ريدوميل جولد مانكوزيت 250 جم لكل 100 لتر ماء
أكواجين برو 40 جم لكل 100 لتر ما




http://www.extension.umn.edu/gardeninfo/diagnostics/images/tomato/diseases/alternaria3_600px.jpg


http://www.extension.umn.edu/gardeninfo/diagnostics/images/tomato/diseases/alternaria2_600px.jpg

و السلام عليكم

[salam08]

و عليكم السلام و رحمة الله و بركاته


بارك الله فيك اخي امين ...لطالما لاحظت هذا المرض على حبات الطماطم في السنوات السابقة
هذا العام كان انتاج الطماطم مبكراااا لهذا لم الاحظه كما أن الكمية كانت قليلة ...

جميل ان تتعرف عن قرب على العالم الأخضر ...العام الجاي ان شاء الله نديرو احتياطاتنا :18:

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