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Red chard

Chard    Morocco

Good afternoon, in our red chard is appearing some pink spots on the leaf and we do not know which could be the reason, probably some temperature or humidity stresses?.

Thank you.


Posted by: Sara (1 point) Sara
Posted: October 30, 2017

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It could be a Cercospora leaf spot, a fungal disease caused by Cercospora beticola. How is the weather there? Normally the disease is favored by high temperatures, humidity and long leaf wetness periods at night.
The main symptoms are appearance of "numerous, initially small circular leaf spots . Spots have a pale brown to off-white center with a red margin. Lesions expand in size, coalesce, turn gray as the fungus sporulates, and can result in extensive loss of foliage. Leaves at the center of the plant are often less severely affected. The pathogen produces sclerotia or stromata which can be seen with a hand lens as small, black dots in the center of lesions. Lesions may also occur on petioles, flower bracts, seed pods, and seeds. Leaf symptoms are similar to those caused by Beet Phoma (Phoma betae), except that the phoma will have more obvious tiny fruiting bodies in the lesions and can also affect the roots."


https://ag.umass.edu/vegetable/fact-s...


Posted by: Dr. Ravishankar Narayana (134 points) Dr. Ravishankar Narayana
Posted: November 2, 2017

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Sara commented,
Thank you very much Dr. Ravishankar. It seems that you are right.
Regards.

16 days ago.



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