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Author Topic: Primary Causal Agent ?  (Read 23602 times)

Online Kirk Allen

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Re: Primary Causal Agent ?
« Reply #25 on: February 07, 2009, 11:42:32 AM »
Stephen, what is a sawflie?  I have not heard that term before.  Is that similar to a Powder Post beatle?
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Offline Stephen Wiley

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Re: Primary Causal Agent ?
« Reply #26 on: February 07, 2009, 01:54:26 PM »
No, powder post attack downed wood and are eating and nesting in the wood.

Sawflies are one of the many insects that are generally eat foliage (can totally defoliate or skelontize) . They go through several stages of growth and some of them will bore into the trunk, branches. These boring sites can look like bark borer damage.

Here is a site showing the Oak Shoot Sawfly which is known to bore.

http://www.forestryimages.org/browse/detail.cfm?imgnum=3066095


Online Kirk Allen

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Re: Primary Causal Agent ?
« Reply #27 on: February 07, 2009, 03:48:25 PM »
Wow :o  I've never seen anything like that around here.  Are they common throughout the US?
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Offline Stephen Wiley

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Re: Primary Causal Agent ?
« Reply #28 on: February 07, 2009, 11:03:52 PM »
Kirk, this will be a long response.  I am not certain if all 50 states have sawflies. Some sawflies have been imported and have overtaken from the east coast along the northern & central states to the Pacific. Many sawfly adults are not often observed.  A tree being defoliated by the worm/caterpillar larvae may be found by a forester/arborist. Simply put many people do not notice tree health impacts up close, until the tree is dead or in serious decline.

Taken from USDA Report 1998 more recent surveys encompass Illinois counties.

Scarlet oak sawfly, Caliroa quercuscoccineae

Region 9/Northeastern Area: Ohio, West Virginia
Hosts: Black oak, pin oak, red oak, scarlet oak, white oak
The scarlet oak sawfly infestation contined for the second year in southeast Ohio and southwest West Virginia. An area encompassing 217,635 acres was defoliated on the Wayne National Forest in Ohio, and an addtional 76,791 acres was defoliated on adjacent and surrounding private lands. In West Virginia, 185,638 acres was defoliated in Mason, Cabell, Putnam, and Wayne Counties. This area also experienced heavy locust leafminer damage.

Another site showing geographical saturation by the Scarlet Oak Sawfly.   

http://forestry.about.com/library/silvics/blsilquepal.htm

European Sawfly site for Illinois   

http://urbanext.illinois.edu/bugreview/europeanpinesawfly.html

USDA Pest Alert:

http://na.fs.fed.us/spfo/pubs/pest_al/sawfly/sawfly.htm



Online Kirk Allen

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Re: Primary Causal Agent ?
« Reply #29 on: February 08, 2009, 08:12:27 AM »
Great info!  Thanks for the links!  :)
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Offline Stephen Wiley

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Re: Primary Causal Agent ?
« Reply #30 on: February 09, 2009, 08:41:45 PM »
 ;) ;D