Set Sappling

So I just updated to 1.8.6 and now when I set saplings it sets oak saplings instead of birch and I have looked and looked to change from oak to birch but I cannot figure it out. Please help

Code (Text):

if((locUnder.getBlock().getType() == Material.DIRT) || (locUnder.getBlock().getType() == Material.GRASS)){
            w.dropItem(block.getLocation(), drop);
            event.setCancelled(true);
            b.setType(Material.SAPLING); //THE THING I WANA FIX
 

I tried using setData but I am sure I dont know how to use it

 

This worked! Thanks! Only thing is is that it is depreciated. Lets just hope it is not removed