why doesnt this weapon burn trees?

[Optimus Prime]

name=Flamer;
rendertype=5;
lineofsight=1;
turret=1;
range=620;
reloadtime=3.9;
weapontimer=0.5;
weaponvelocity=400;
areaofeffect=50;
burst=300;
burstrate=.015;
burnblow=0;
sprayangle=42000;
randomdecay=.4;
soundstart=Flamhvy1;
firestarter=100;
groundbounce=1;
smokedelay=1;
startsmoke=1;
endsmoke=1;
tolerance=1000;
[DAMAGE]
{
default=60;
WARBOT=3;
}

shouldnt firestarter=100 work?