[MAIPC] Can anyone tell me who this is?

[Judith Hough-Goldstein]

Wow, impressive aphid infestation! This is probably the cabbage aphid,
Brevicoryne brassicae, which has that grayish waxy covering
and feeds on a lot of different plant species in the Brassicaceae. It also
has a common parasitoid that would produce aphid mummies as observed by
Deborah Barber.
http://entnemdept.ufl.edu/creatures/veg/aphid/cabbage_aphid.htm

Judy Hough-Goldstein
Professor Emeritus, Entomology, Univ. Delaware

On Fri, Jun 5, 2020 at 3:56 PM Ross Campbell <rosscampbell728 at gmail.com>
wrote:

>
>
> On Thu, Jun 4, 2020 at 8:34 PM Ross Campbell <rosscampbell728 at gmail.com>
> wrote:
>
>> I took these pics today in Silver Spring MD near Sligo Creek Park. This
>> is second or third time I have seen what I assume to be aphids on GM this
>> spring.
>>
>> Ross Campbell
>> Montgomery County Weed Warrior
>>
>> On Thu, Jun 4, 2020 at 12:46 PM Deborah Barber <DBarber at tnc.org> wrote:
>>
>>> Do these have legs?  Can they be knocked off, or do they appear to be
>>> part of the plant (which would suggest a gall)? These remind me
>>> (color,size, shape) of what I’ve been seeing that I think are aphid
>>> mummies. https://extension.umd.edu/hgic/topics/aphid-parasitoids  The
>>> ones I saw in April seemed to still be occupied but recent ones are broken
>>> and hollow, suggesting the wasps have emerged.  I’ve suggested aphidius on
>>> several iNaturalist observations
>>> <https://www.inaturalist.org/observations?place_id=any&subview=table&taxon_id=250247>
>>> I’ve made but people are not exactly lining up to confirm any aphidius
>>> ID’s.  Also…I’ve never noticed aphids on the undersides of garlic mustard
>>> leaves?
>>>
>>>
>>>
>>> *Deborah Barber*
>>>
>>> * Director of Land Management              *dbarber at tnc.org
>>> 240.630.7042 (Phone)
>>> nature.org/MarylandDC
>>>
>>> <https://www.google.com/maps/search/425+Barlow+Place+%0D%0A+Suite+100+%0D%0A+Bethesda,+MD+20814?entry=gmail&source=g>
>>> <https://www.google.com/maps/search/425+Barlow+Place+%0D%0A+Suite+100+%0D%0A+Bethesda,+MD+20814?entry=gmail&source=g>
>>>
>>> *               The Nature Conservancy*
>>> *               Maryland/DC Chapter*
>>>
>>>                425 Barlow Place
>>> <https://www.google.com/maps/search/425+Barlow+Place+%0D%0A+Suite+100+%0D%0A+Bethesda,+MD+20814?entry=gmail&source=g>
>>>
>>>                Suite 100
>>> <https://www.google.com/maps/search/425+Barlow+Place+%0D%0A+Suite+100+%0D%0A+Bethesda,+MD+20814?entry=gmail&source=g>
>>>
>>>                Bethesda, MD 20814
>>> <https://www.google.com/maps/search/425+Barlow+Place+%0D%0A+Suite+100+%0D%0A+Bethesda,+MD+20814?entry=gmail&source=g>
>>>
>>>
>>>
>>>
>>>
>>> *At TNC we work flexibly, so while it suits me to email now, I don’t
>>> anticipate a response outside your normal hours.*
>>>
>>>
>>>
>>>
>>>
>>> *From:* MAIPC <maipc-bounces at lists.maipc.org> *On Behalf Of *MARGARET L
>>> CHATHAM
>>> *Sent:* Thursday, June 04, 2020 12:18 PM
>>> *To:* MAIPC at lists.maipc.org
>>> *Subject:* [MAIPC] Can anyone tell me who this is?
>>>
>>>
>>>
>>> Found these on a number of garlic mustard leaves and siliques. The
>>> leaves showed no damage on the upper surfaces. I couldn’t see any exit
>>> holes on many of these, but they were crushable and appeared unoccupied.
>>>
>>> Thanks for any info.
>>>
>>> Margaret
>>>
>>>
>>>
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>>>
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