Rosemary diseases on leaf after cutting
Rosemary Italy
Good evening, sometimes we have a problem in some of our rosemary plant, cultivated in pot. We are in Italy, Province of Livorno, and in september, after our cutting operation, leaf of the low part of plant became ill and look like in the photos I have just posted.
We have a doubt: is this problem Peronospora lami or Alternaria sp? We believe that is the second one.
Thank you.
We have a doubt: is this problem Peronospora lami or Alternaria sp? We believe that is the second one.
Thank you.
Rosemary upper surface of leaf
Rosemary down part of leaf
Posted
by: Alessandro Caroti
(1 point)
Posted: November 20, 2017
Answers
Hi Alessandro, the best way to identify the disease is looking for spores. Do you have microscope facility?
The microscopic examination of Peronospora lamii should reveal mycelia with irregular dichotomously branched conidiophores with pointed tips and brown oval conidia.
http://www.apsnet.org/publications/pl...
Whereas the Alternaria spores are club shaped.
https://www.uoguelph.ca/~gbarron/MISC...
The microscopic examination of Peronospora lamii should reveal mycelia with irregular dichotomously branched conidiophores with pointed tips and brown oval conidia.
http://www.apsnet.org/publications/pl...
Whereas the Alternaria spores are club shaped.
https://www.uoguelph.ca/~gbarron/MISC...
Peronospora lamii mycelia, conidiophores and conidia.
Conidia of Alternaria blight
Posted
by: Dr. Ravishankar Narayana
(15 points)
Posted: November 21, 2017
Alessandro Caroti commented,
Thank you Dr. Narayana for your answer and photos. In this moment I don't have any microscope facilty, but I'll try to organized. Thank almost 7 years ago.
Thank you Dr. Narayana for your answer and photos. In this moment I don't have any microscope facilty, but I'll try to organized. Thank almost 7 years ago.
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