2 Mildews

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July 23, 2015 at 3:21 pm #29552
jimmymac2
While on a walk today to do my big butterfly count, I saw two mildews. I was wondering if they could be identified to species?

~~[attachment=1]~~DSCN5362 r.jpg[/attachment]

~~[attachment=0]~~DSCN5346 r.jpg[/attachment]
July 23, 2015 at 3:36 pm #35363
Chris Yeates
Hi Jimmy

in answer to your question yes, most powdery mildews can be identified based on host alone. What you have there are:

on hogweed Erysiphe heraclei

on oak Erysiphe alphitoides

The chasmothecia (=cleistothecia) which contain the asci and ascospores appear later in the season, often preferentially on the underside of the leaves. They can be worth looking at under the microscope : ~~http://www.ascofrance.com/search_recolte/3883” class=”bbcode_url”>~~http://www.ascofrance.com/search_recolte/3883 (click on thumbnail).

cheers

Chris

PS have you spotted my response to ~~http://www.fungi.org.uk/viewtopic.php?f=9&p=1469&sid=95dff433cba523ac19bd69edf1c9dc66#p1469” class=”bbcode_url”>~~http://www.fungi.org.uk/viewtopic.php?f=9&p=1469&sid=95dff433cba523ac19bd69edf1c9dc66#p1469? You haven’t commented . . . .
July 24, 2015 at 6:48 am #35364
jimmymac2
Hi Chris,

Thanks for the ID’s, I really wasn’t expecting them to be so straightforward!!!

Great images on AscoFrance!!

James
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