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Erysiphe sp. ? on Foeniculum vulgare
Stephen Martin,
16-10-2016 18:42
Today I found two specimens of Foeniculum vulgare (fennel) covered with a blanket of sparse white mycelium. Under the microscope I observed a white-semi-hyaline profusely branched mycelium over the epidermis of the host's leaves (=cladodes) but imprgenanting down into the host tissues at regular intervals. The mycelium produced upright perpendicular, simple, 2-3 (4) segmented, 70-100um long branches (conidiophores) were the last cell, fragments away and becomes free as a conidia. The conidia are 30-40um x 10-17um wide, rectangular with truncate sides, finely dotted, an a thick wall, somewhat more thick at one pole forming an eccentric hyphal content. The surface seams to be rought at the perimiter. No Cleistothecium was observed, perhaps the mycelium is young.I think it is an Erysiphe spp. but can you confirm or suggest alternative IDs please (Microsphaera spp. ??)
IMG-2237-0001.JPG
Stephen Martin,
16-10-2016 18:50
Re : Erisphye sp. ? on Foeniculum vulgare
PS: What is the best method to induce the mycelium on the sample to form the sexual cleistotheca at home? I placed it in a moisture chamber at room temp.
Angel Pintos,
16-10-2016 19:41
Re : Erisphye sp. ? on Asparagus aphyllus
esto es lo que tengo sobre el tema
un saludo
Angel
un saludo
Angel
Stephen Martin,
17-10-2016 07:53
Re : Erisphye sp. ? on Foeniculum vulgare
Thank you, I try to experiment a bit. I think I would not have any success on the small samples I've collected, but I can try to place in a dry place (behind a window) and one in a closed compartement with silica gel.
Just one more note - This mildew was found in the wild on two Foenicul vulgare (common fennel), about 100m apart... = it seems to be specific to fennel. Any bells ringing?
Just one more note - This mildew was found in the wild on two Foenicul vulgare (common fennel), about 100m apart... = it seems to be specific to fennel. Any bells ringing?
Dartanha Soares,
17-10-2016 20:57
Re : Erisphye sp. ? on Asparagus aphyllus
Are you sure about the host identity?
I checked some powdery mildew monographs (Amano, 1986. Host range and geographical distribution of the powdery mildew fungi; Braun, 1987. A monograph of the Erysiphales; Braun & Cook, 2011. Taxonomic Manual of the Erysiphales) and found no reports of powdery mildew on such host. I also checked the USDA - SMML repository (http://nt.ars-grin.gov/fungaldatabases/index.cfm) and the search returned zero powdery mildew for the genus Asparagus, too.
If you are sure about the host identity, please get in touch with Uwe Braun (uwe.braun@botanik.uni-halle.de), I'm sure he will be glad to help you.
I checked some powdery mildew monographs (Amano, 1986. Host range and geographical distribution of the powdery mildew fungi; Braun, 1987. A monograph of the Erysiphales; Braun & Cook, 2011. Taxonomic Manual of the Erysiphales) and found no reports of powdery mildew on such host. I also checked the USDA - SMML repository (http://nt.ars-grin.gov/fungaldatabases/index.cfm) and the search returned zero powdery mildew for the genus Asparagus, too.
If you are sure about the host identity, please get in touch with Uwe Braun (uwe.braun@botanik.uni-halle.de), I'm sure he will be glad to help you.
Stephen Martin,
17-10-2016 21:27
Re : Erisphye sp. ? on Foeniculum vulgare
I was going to reply that I am sure it was a young soft shoot of Asparagus, but you are right to point it out because now I have the doubt that it could have been a small plant of Foeniculum vulgare or Ferula communis. I will check the plant again to be 100% however the area was an understory shaded scrub composed of many Asparagus aphyllus, (although I can't exlude Ferula/Foeniculum).
Are any Erisyphe spp. recorded on Ferula/Foeniculum? According to the database link you kindly provided, there is no linke between Erisyphe spp. and Apiaceae but I do not have the monographs you mentioned. Interesting!
Are any Erisyphe spp. recorded on Ferula/Foeniculum? According to the database link you kindly provided, there is no linke between Erisyphe spp. and Apiaceae but I do not have the monographs you mentioned. Interesting!
Stephen Martin,
17-10-2016 21:47
Re : Erisphye sp. ? on Foeniculum vulgare
hmm... this might be leading to the correct track:
http://www.mycobank.org/BioloMICS.aspx?TableKey=14682616000000067&Rec=284030&Fields=All
Erysiphe umbelliferarum f. ferulae Golovin: 143 (1961)
which is a synonym of
Erysiphe heraclei DC., Flore française 6: 107 (1815)
http://www.mycobank.org/BioloMICS.aspx?TableKey=14682616000000067&Rec=284030&Fields=All
Erysiphe umbelliferarum f. ferulae Golovin: 143 (1961)
which is a synonym of
Erysiphe heraclei DC., Flore française 6: 107 (1815)
Dartanha Soares,
17-10-2016 21:57
Re : Erisphye sp. ? on Asparagus aphyllus
Ok, please check the host.
Well, on Ferula spp. (but not on F. communis) there is the report of the ubiquitous Erysiphe heraclei, from Romania, India and Kazakhstan (reported as the former USSR).
PS.: Sorry for the image, it was the best I could get.
Well, on Ferula spp. (but not on F. communis) there is the report of the ubiquitous Erysiphe heraclei, from Romania, India and Kazakhstan (reported as the former USSR).
PS.: Sorry for the image, it was the best I could get.
Braun-1987-A-monograph-of-the-Erysiphales-0001.jpg
Stephen Martin,
17-10-2016 23:05
Re : Erisphye sp. ? on Foeniculum vulgare
That's so much helpful! THANK YOU. The asexual characters and dimensions match with my specimen. I'll confirm the hst shortly.
Thanks once again.
I see if I can download the monograph from somewhere, since it is very detailed.
Thanks once again.
I see if I can download the monograph from somewhere, since it is very detailed.
Stephen Martin,
26-10-2016 19:34
Re : Erisphye sp. ? on Foeniculum vulgare
Dear Darthana... sorry for the delay but also for the wrong info on the host. I've went back to the specimen and confirmed Foeniculum vulgare. Four Eriphyse spp. have been reported on this host, but most common is E. heraclei:
Erysiphe cichoracearum Spain - 7190,
Erysiphe cichoracearum Spain - 7190,
Erysiphe heraclei Argentina - 35984,Brazil - 47949,Bulgaria - 13300, 37557,California - 48112,Colombia - 40553,Egypt - 7190,France - 7190, 13300,India - 7190,Italy - 7190, 13300,Korea - 47939,Pakistan - 7190,Poland - 7190, 13300, 44009,Spain - 7190, 13300,Ukraine - 13300,USSR - 7190,
Erysiphe lichenoides Portugal - 8480,
Erysiphe taurica Spain - 8480,
I guess this new info makes the finding less important on an international level, but likely a new species for Malta (= I need to check old records), although I wish to confirm the species by examinng the cleistothecae which so far have not been produced after leaving the leaves covered by the asexual hyphae to dry in air or in a closed container with few silica gel.
Dartanha Soares,
26-10-2016 20:42
Re : Erisphye sp. ? on Foeniculum vulgare
Well, you are right, this isn't a big novelty. Even so, as you said, once you "confirm" this species is not reported in Malta, you can publish this as a new record (I still reccommend you to send a sample to Uwe Braun, to get the correct identity of the fungus).
Unfortunately, I can't help you further on the induction of the chasmothecium formation (beyond what was already published), since here in Brazil powdery mildews rarely form such structures and I never did any attempt to do it.
All the best!
Unfortunately, I can't help you further on the induction of the chasmothecium formation (beyond what was already published), since here in Brazil powdery mildews rarely form such structures and I never did any attempt to do it.
All the best!
Stephen Martin,
29-10-2016 13:30
Re : Erisphye sp. ? on Foeniculum vulgare
I just wished to add some fresh photos before I show it to Uwe braun through this forum. Check image caption for further notes
