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<blockquote data-quote="ktm450" data-source="post: 264030" data-attributes="member: 5891"><p>just went thru this last week.. between my neighbor and I we had 35+ Colorado blue spruce and black hills spruce get attacked by these bugs.&nbsp; you are correct, they are saw flies.&nbsp; I waited till late at night as I was told to not spray the trees during the day when its hot out so last Thursday night when the wind wasn't blowing I sprayed them till midnight.&nbsp; completed trenched the trees with the spray and come morning time every tree had dead caterpillars laying under them and by the second day there wasn't one left on any of the trees.&nbsp; so far the trees looking to be holding up, I think I may have lost one. Will wait till next spring to see if it makes a come back.here is what was the soil conservation sent to me, and the recommendation I got from plant perfect for chemical to use.&nbsp; for my 21 trees I used 5 gallons of water/chemical mixture.<a href="https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/fsbdev2_037814.pdf" target="_blank">https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/fsbdev2_037814.pdf</a></p></blockquote><p></p>

[QUOTE="ktm450, post: 264030, member: 5891"] just went thru this last week.. between my neighbor and I we had 35+ Colorado blue spruce and black hills spruce get attacked by these bugs. you are correct, they are saw flies. I waited till late at night as I was told to not spray the trees during the day when its hot out so last Thursday night when the wind wasn't blowing I sprayed them till midnight. completed trenched the trees with the spray and come morning time every tree had dead caterpillars laying under them and by the second day there wasn't one left on any of the trees. so far the trees looking to be holding up, I think I may have lost one. Will wait till next spring to see if it makes a come back.here is what was the soil conservation sent to me, and the recommendation I got from plant perfect for chemical to use. for my 21 trees I used 5 gallons of water/chemical mixture.[url]https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/fsbdev2_037814.pdf[/url] [/QUOTE]

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