[JunOS] Can i disable some VLAN's from an MSTP instance?

I have a ring topolgy of switches. Here is running MSTP to avoid loops. Something like this http://www.hoggnet.com/NWWPics/Ethernet-Ring.png

At the same time every switch runs OSPF between each other. Every switch has an exclusive VLAN that goes to the next. OSPF runs between the irb's interfaces as point-to-point.

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What i want to know is if i can disable those VLANs(the ones that runs OSPF) to run spanning tree.