[APWG] FW: host for bio controls of mivcrostegium off season

Sat Jul 16 07:15:09 CDT 2022

From: Bruckart, William <William.Bruckart at ARS.USDA.GOV
<mailto:William.Bruckart at ARS.USDA.GOV> > 
Sent: Thursday, October 22, 2015 11:40 AM
To: ialm at erols.com <mailto:ialm at erols.com> ; 'Hough-Goldstein, J A'
<jhough at udel.edu <mailto:jhough at udel.edu> >
Subject: RE: host for bio controls of mivcrostegium off season

Correct, Marc.  These rust fungi would overwinter as telia on U.S.
Microstegium, if it's susceptible.  We are assuming plants from each region
are the same.  We are also learning about extremes of variability in
susceptibility within U.S. populations to Bipolaris microstegii, so there
might be need to develop this understanding about Microstegium vimineum for
the rust diseases (and insects?).  Details to follow, hopefully.  Cheers!

William L. Bruckart, III

USDA, ARS, FDWSRU

1301 Ditto Ave.

Ft. Detrick, MD 21702

  Phone: 301/619-2846

  Email: william.bruckart at ars.usda.gov
<mailto:william.bruckart at ars.usda.gov> 

From: Marc Imlay [mailto:ialm at erols.com] 
Sent: Thursday, October 22, 2015 11:32 AM
To: Bruckart, William; 'Hough-Goldstein, J A'
Subject: RE: host for bio controls of mivcrostegium off season

So if a species of Puccinia in Asia is verified to be host specific on
Microstegium it would be host specific on Japanese Stilt grass in America
since this is the only species in the genus Microstegium in America as I
understand it. And nothing else would need to be brought over to support it
in the Winter time. 

Marc

From: Bruckart, William [mailto:William.Bruckart at ARS.USDA.GOV] 
Sent: Thursday, October 22, 2015 9:17 AM
To: Hough-Goldstein, J A <jhough at udel.edu <mailto:jhough at udel.edu> >;
ialm at erols.com <mailto:ialm at erols.com> 
Subject: RE: host for bio controls of mivcrostegium off season

Hi Marc and Judy,

I appreciate the update from Judy about the insects.  For the fungi, there
are a couple of mechanisms.  Rust fungi in the genus Puccinia have several
spore forms in their life cycle, one of which is the teliospore, packed into
a pustule called a telium.  Teliospores are thick-walled, melanized (dark
brown) able to withstand harsh environmental conditions.  This is the
overwintering stage of the fungus, and it germinates in the spring,
producing basidiospores that cause the initial infections of the new season.

The Bipolaris you mentioned (there's one on Japanese stiltgrass; not sure
about Microstegium), is a facultative saprophyte, i.e., it can live
saprophytically on dead or dying plant material.  These overwinter in leaf
litter, either from the host or other plants, often in various hard or
embedded structures that facilitate survival.  When conditions are favorable
in the spring, spores are released from these structures and initiate a new
disease cycle.

I trust that helps, Marc.  Let me know if there are other questions.  Thanks
again for opportunity at the BioBlitz.  It was very good to be there.

Cheers!
Bill

William L. Bruckart, III

USDA, ARS, FDWSRU

1301 Ditto Ave.

Ft. Detrick, MD 21702

  Phone: 301/619-2846

  Email: william.bruckart at ars.usda.gov
<mailto:william.bruckart at ars.usda.gov> 

From: Hough-Goldstein, J A [mailto:jhough at udel.edu] 
Sent: Thursday, October 22, 2015 8:28 AM
To: ialm at erols.com <mailto:ialm at erols.com> ; Bruckart, William
Subject: RE: host for bio controls of mivcrostegium off season

Mark,

After gorging on the plant in the fall before the frost kills it, the
mile-a-minute weevil adults spend the winter in the soil or leaf litter
(probably under the plant, but they may go into the woods as many insects do
that overwinter as adults - we don't know) - in a state of "hibernation"
(probably not a true diapause, since people see them wandering around on
warm days in winter). Not sure about the fungi.

Judy

From: Marc Imlay [mailto:ialm at erols.com] 
Sent: Thursday, October 22, 2015 6:00 AM
To: Bruckart, William; Hough-Goldstein, J A
Subject: host for bio controls of mivcrostegium off season

Hi Bill and Judy,

I was asked what would be the hosts for bio controls of Microstegium off
season. The weevils for mile-a-minute live in the plant in the winter. A
biocontrol for wavyleaf might live in the roots in the winter. For
Microstegium where would the native Bipolaris, or non-native Puccinia or
insects hang out from November to June?

Marc Imlay, PhD, Chair, Biological control working Group  

Conservation biologist, Park Ranger Office, Non-native Invasive Plant
Control coordinator. 
(301) 442-5657 cell   <mailto:ialm at erols.com> ialm at erols.com
Natural and Historical Resources Division
The  Maryland-National   Capital   Park  and Planning Commission
 <http://www.pgparks.com/> www.pgparks.com  

  _____  

 <https://www.avast.com/antivirus> 

This email has been checked for viruses by Avast antivirus software. 
www.avast.com <https://www.avast.com/antivirus>  

  _____  

 <https://www.avast.com/antivirus> 

This email has been checked for viruses by Avast antivirus software. 
www.avast.com <https://www.avast.com/antivirus>  

  _____  

 <https://www.avast.com/antivirus> 

This email has been checked for viruses by Avast antivirus software. 
www.avast.com <https://www.avast.com/antivirus>  

-- 
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.plantconservation.org/pipermail/apwg_lists.plantconservation.org/attachments/20220716/b7967cc7/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 823 bytes
Desc: not available
URL: <http://lists.plantconservation.org/pipermail/apwg_lists.plantconservation.org/attachments/20220716/b7967cc7/attachment.jpg>