Re: Re: River Birch

In a message dated 8/9/06 3:34:20 PM, holmesbm@usit.net writes:


> Is there anything that can stop/deter/reduce this borer.
> 

Treatment is not recommended in area.   In 05' sentinel/"trap" trees were 
established at 12 sites across central & eastern Iowa before Memorial Day.   
About half of these wer 2" caliper green or white ash trees in containers.   They 
were planted in campgrounds where natural stands of ash trees were limited.   
The trees were removed from their plastic pots & put in the ground, but in a 
shallow hole to mimic drought stress.   Other trap trees were created by db 
girdling ash trees (4 - 13" dia.) where native ash stands were plentiful.   
Because sex pheromones are not known for the EAB, an intentionally stressed tree is 
thought to be more attractive in insect borers.   Fall 05' the sentinel trees 
were cut down, bark peeled following the USDA Forest Serv protocol for this 
insect and any borer larvae were preserved.   Approx 2/3ths of the trap treese 
displayed evidence of destructive insect activity but only native borers were 
found which included redheaded ash borer, ash/lilac borer, 2 types of bark 
beetles & a native flatheaded borer.   No EAB.
     Trapped trees were placed this year in Iowa located fed, st & county 
campgrounds.   Campgrounds are considered the highest risk sites in the state as 
the EAB moves long distance in firewood.   Campers bringing firewood into Iowa 
from Mi, In and Oh were observed in a federal campground.   Park mgrs exchg 
the firewood for local wood and examined the imported wood.   Fortuneately no 
EAB was found.
     EAB Facts:     Adult EAB leave 'D shaped' emergence holes on the tree 
trunks. Native borers leave rd or oval holes.   White larvae feed under the bark 
and produce 'S shaped' tunnels.   Here are web sites that can give you addtl 
infor. 
www.emeraldashborer.info
www.emeraldashborer.info/files/e-2939.pdf               

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