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Those caterpillars are sawfly larvae, and you also have the dreaded pine scale, a super pain in the butt when it comes to pines in general, and Mugos in particular. Please do a search on these to pests so you will understand them well. They will likely be intermittent problems for you. Generally, I come from the camp of using the least toxic remedy avaiable to do the trick. Manually removing the sawfly larvae works form me. As far as the scale goes, I have only had luck with systemics, and even that is debatable. Good luck,

Dave

12-May-2008	#4
Dav4 bonsaiTALK Master Craftsman Join Date: Jan-2005 Location: SE Massachusetts Country: USA USDA Zone: 6 AHS Heat Zone: 4-5 Posts: 603	Those caterpillars are sawfly larvae, and you also have the dreaded pine scale, a super pain in the butt when it comes to pines in general, and Mugos in particular. Please do a search on these to pests so you will understand them well. They will likely be intermittent problems for you. Generally, I come from the camp of using the least toxic remedy avaiable to do the trick. Manually removing the sawfly larvae works form me. As far as the scale goes, I have only had luck with systemics, and even that is debatable. Good luck, Dave