[NatureNS] Curious growths on oak tree leaves

From: Christopher Majka <c.majka@ns.sympatico.ca>
To: naturens@chebucto.ns.ca
Date: Thu, 16 Jul 2009 23:35:36 -0300
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Hi Maria,

Cynipids are small wasps that fly very well and (one presumes) are  
readily able to detect oak trees. You'd probably have to collect and  
destroy all the galls from all the oaks from a very substantial area  
(on the order of a kilometer or more I should guess) in order to  
eliminate the supply of cynipds able to colonize your tree - a  
substantial amount of work I would assume ... ;->

Cheers!

Chris

On 16-Jul-09, at 11:17 PM, Phil & Maria wrote:

> The cycle of laying the eggs and them showing up on the leaves...if  
> I collect all the leaves that have the galls on them and destroy  
> them, will this eventually stop happening to the tree...I guess if  
> they're not really harming anything it's no big deal and I probably  
> wouldn't be able to stop it from happening anyways.
> Maria
>
> Christopher Majka wrote:
>>
>> Hi Maria,
>>
>> On 16-Jul-09, at 9:44 PM, Phil & Maria wrote:
>>
>>> Thanks Christopher!
>>> I followed your link and read up on the apple gall  
>>> wasp...apparently it's nothing to worry about, and I need not do  
>>> anything at all as it won't harm the tree and it won't harm people.
>>> I'm wondering tho, if I destroy the galls when the first start  
>>> appearing, will I eventually break the cycle?
>>
>> Break what cycle?
>>
>>> Another interesting note...there is a young oak tree at my cottage  
>>> in Upper Economy...my father planted both these trees...the one at  
>>> the cottage first, and mine a couple of years later.  I checked  
>>> the cottage one...there are no galls on it this year at all,  
>>> although I know they have been there previous years...I wonder why  
>>> that is?
>>
>> Nature has many mysteries, and unfortunately trees can't  
>> speak ... ;->
>>
>> Cheers!
>>
>> Chris
>>
>>
>> Christopher Majka  <c.majka@ns.sympatico.ca> | Halifax, Nova  
>> Scotia, Canada
>>
>> * Research Associate: Nova Scotia Museum | http://museum.gov.ns.ca/mnh/research-asfr.htm
>> * Review Editor: The Coleopterists Bulletin | http://www.coleopsoc.org/
>> * Subject Editor: ZooKeys | http://pensoftonline.net/zookeys/index.php/journal/index
>> * Associate Editor: Journal of the Acadian Entomological Society | http://www.acadianes.org/journal.html
>> * Editor: Atlantic Canada Coleoptera | http://www.chebucto.ns.ca/Environment/NHR/atlantic_coleoptera.html
>>
>> "Whenever I hear of the capture of rare beetles, I feel like an old  
>> war-horse at the sound of a trumpet." - Charles Darwin
>>


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<html><body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space; ">Hi =
Maria,<div><br></div><div>Cynipids are small wasps that fly very well =
and (one presumes) are readily&nbsp;able to&nbsp;detect oak trees. You'd =
probably have to collect and destroy all the galls from all the oaks =
from a very substantial area (on the order of a kilometer or more I =
should guess) in order to eliminate the supply of cynipds able to =
colonize your tree - a substantial amount of work I would assume ... =
;-&gt;</div><div><br></div><div>Cheers!</div><div><br></div><div>Chris</di=
v><div><br><div><div>On 16-Jul-09, at 11:17 PM, Phil &amp; Maria =
wrote:</div><br class=3D"Apple-interchange-newline"><blockquote =
type=3D"cite"> <div bgcolor=3D"#ffffff" text=3D"#000000"> The cycle of =
laying the eggs and them showing up on the leaves...if I collect all the =
leaves that have the galls on them and destroy them, will this =
eventually stop happening to the tree...I guess if they're not really =
harming anything it's no big deal and I probably wouldn't be able to =
stop it from happening anyways.<br> Maria<br> <br> Christopher Majka =
wrote: <blockquote =
cite=3D"mid:6F6C87FA-118D-44BD-AB93-35E57D252796@ns.sympatico.ca" =
type=3D"cite">Hi Maria,  <div><br>  <div>  <div>On 16-Jul-09, at 9:44 =
PM, Phil &amp; Maria wrote:</div>  <br =
class=3D"Apple-interchange-newline">  <blockquote type=3D"cite">    <div =
bgcolor=3D"#ffffff" text=3D"#000000"> Thanks Christopher!<br> I followed =
your link and read up on the apple gall wasp...apparently it's nothing =
to worry about, and I need not do anything at all as it won't harm the =
tree and it won't harm people.&nbsp; <br> I'm wondering tho, if I =
destroy the galls when the first start appearing, will I eventually =
break the cycle?<br>    </div>  </blockquote>  <div><br>  </div>  =
<div>Break what cycle?</div>  <br>  <blockquote type=3D"cite">    <div =
bgcolor=3D"#ffffff" text=3D"#000000"> Another interesting note...there =
is a young oak tree at my cottage in Upper Economy...my father planted =
both these trees...the one at the cottage first, and mine a couple of =
years later.&nbsp; I checked the cottage one...there are no galls on it =
this year at all, although I know they have been there previous =
years...I wonder why that is?<br>    </div>  </blockquote>  </div>  <br> =
 </div>  <div>Nature has many mysteries, and unfortunately trees can't =
speak ... ;-&gt;</div>  <div><br>  </div>  <div>Cheers!</div>  <div><br> =
 </div>  <div>Chris</div>  <br>  <br>  <div apple-content-edited=3D"true">=
 <span class=3D"Apple-style-span" style=3D"border-collapse: separate; =
color: rgb(0, 0, 0); font-family: 'Times New Roman'; font-size: 14px; =
font-style: normal; font-variant: normal; font-weight: normal; =
letter-spacing: normal; line-height: normal; orphans: 2; text-indent: =
0px; text-transform: none; white-space: normal; widows: 2; word-spacing: =
0px;">  <div style=3D""><span class=3D"Apple-style-span" =
style=3D"border-collapse: separate; color: rgb(