The following relationships have been collated from the published literature (see 'Interaction References').
Filters:
Affected Part | Summary | Taxon | Vernacular | Classification | References | |||
---|---|---|---|---|---|---|---|---|
mycelium is food source of larva | Halyzia sedecimguttata | Orange Ladybird | Coleoptera: Coccinellidae | Ladybirds, Majerus, M. & Kearns, P., 1989 |
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mycelium is food source of larva | Tytthaspis sedecimpunctata | Sixteen-spot Ladybird, 16-spot Ladybird | Coleoptera: Coccinellidae | Ladybirds, Majerus, M. & Kearns, P., 1989 |
||||
is grazed by larva | Mycodiplosis | rust midges | Diptera: Cecidomyiidae | A Dipterist’s handbook, Stubbs, A.E. & Chandler, P. (eds), 1978 |
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mycelial mat | mycelial mat is parasitised by pycnidium of Ampelomyces coelomycetous anamorph | Ampelomyces quisqualis | a coelomycete | Pleosporales: Phaeosphaeriaceae | Fungi of the South East England, Dennis, R.W.G., 1995 Microfungi on Land Plants: An Identification Handbook, Ellis, M.B. & J.P., 1997 Microfungi on Miscellaneous Substrates: An Identification Handbook, Ellis, M.B. & J.P., 1998 |
Author & Year | Title | Source |
---|---|---|
Dennis, R.W.G., 1995 | Fungi of the South East England | 383pp, Royal Botanic Gardens, Kew |
Ellis, M.B. & J.P., 1997 | Microfungi on Land Plants: An Identification Handbook | 2nd (New Enlarged) edition, 868pp, The Richmond Publishing Co. Ltd |
Ellis, M.B. & J.P., 1998 | Microfungi on Miscellaneous Substrates: An Identification Handbook | 2nd (New Enlarged) edition, 246pp, The Richmond Publishing Co. Ltd |
Majerus, M. & Kearns, P., 1989 | Ladybirds | Naturalists’ Handbooks, 10, 103pp, The Richmond Publishing Co. Ltd |
Stubbs, A.E. & Chandler, P. (eds), 1978 | A Dipterist’s handbook | Vol 15, 255pp, Amateur Entomologists’ Society |
ERYSIPHACEAE (powdery mildews) may be included in 'feeds on' relations listed under the following higher taxa:
Subtaxon | Rank | Featured subtaxa |
No of interactions |
No of references |
|||
---|---|---|---|---|---|---|---|
Species | 4 trophisms | ||||||
Species | 100 trophisms | 1 references | |||||
Genus | 63 subtaxa | 691 trophisms | 30 references | ||||
Genus | 16 subtaxa | 326 trophisms | 3 references | ||||
Genus | 3 subtaxa | 22 trophisms | |||||
Genus | 1 subtaxa | 6 trophisms | 1 references | ||||
Genus | 2 subtaxa | 50 trophisms | 4 references | ||||
Genus | 2 subtaxa | 3 trophisms | 1 references | ||||
Genus | 9 subtaxa | 34 trophisms | 2 references | ||||
Genus | 26 subtaxa | 336 trophisms | 6 references | ||||
Genus | 2 subtaxa | 2 trophisms | 1 references | ||||
Genus | 2 subtaxa | 11 trophisms | 3 references |
NBN (data.nbn.org.uk) has a distribution map for ERYSIPHACEAE (powdery mildews) |
ERYSIPHACEAE (powdery mildews) may be included in identification literature listed under the following higher taxa:
Author | Year | Title | Source |
---|---|---|---|
Zaracovitis, C. | 1965 | Attempts to identify powdery mildew fungi by conidial characters. | TBMS Vol 48 (4): 553-558, Plate 33, 34. |
Literature listed under the following higher taxa may also be relevant to ERYSIPHACEAE (powdery mildews):
BioImages (www.bioimages.org.uk) has 748 images of ERYSIPHACEAE (powdery mildews) |
Powdery mildews are obligate plant parasites, infection usually being through the stomata. The mycelium is superficial on the surface of the leaf or other green parts.
During the early stages of infection, reproduction is asexual by means of conidia, formed in chains on long erect conidiophores.
Later in the season, the sexual (perfect) state is formed, although not in all species. This consists of black cleistothecia (yellow, orange then brown when immature), anchored to the substratum by characteristic radiating hyphae.
Unless it’s obvious from the specimen, always note the identity of the host. It’s best to identify this to species if possible, rather than just to genus.
If cleistothecia are present, the group is easily recognisable - they are just visible to the naked eye and easily seen with a hand lens. The cleistothecia are usually in groups but often very localised and have to be searched for. Look for grey patches.
In the absence of cleistothecia, Powdery Mildews can be distinguished from Downy Mildews under an x20 hand lens by the network of criss-crossing fine white hyphae running closely over the leaf surface like the railway lines at Clapham Junction. Above this is often a forest of erect conidiophores with the conidia just visible under the dissecting microscope or a x20 lens. If conidial production is very abundant, the conidia may aggregate into larger masses and the colony appear granular.
Do not be confused by hyperparasitic fungi, especially Ampelomyces, which is very common.
Look for white coatings on green surfaces. Usually this is obvious, but sometimes there can be just a suggestion of cloudiness.
The structure of the anchoring hyphae on the cleistothecium, the number of asci in the cleistothecium and the number of ascospores in the ascus.
Where cleistothecia are absent, the structure of the conidiophore and mode of production of conidia are used.
Examine under the dissecting microscope to get a general idea of the structure, then examine properly under the compound microscope.
For conidial anamorphs: mount in lactophenol cotton blue.
For cleistothecia: select several ripe cleistothecia with a mounted needle (they’ll stick better if the needle is first dipped in lactophenol and the point touched on paper to remove the excess.) Mount in a generous drop of lactophenol and examine without compression. Then gradually increase the compression a bit at a time by gently tapping the coverslip once or twice; re-examine each time. Count the asci as the cleistothecia burst, and the ascospores as the asci are squeezed out.
For species identification collect material with cleistothecia, if they are present.
Unless otherwise expressly stated, all original material on the BioInfo website by Malcolm Storey is licensed under the above Creative Commons Licence.