How can I set my iPod Touch to only sync songs and not apps?

my itunes has apps in it that i used to have on my ipod but have now deleted. but every time i sync my itouch it reloads these apps. also, if i download any new apps between syncs, if the app isnt on my itunes then it deletes it from my itouch. so is there any way to set it so when i sync my ipod to only sync the songs and not the apps, or just to have it so it makes the apps on my computer match the apps on my ipod instead of the other way around. thanks.