No doubt, these are all under investigations... Even terrorists may research for instanse the use of fire-ants, wich are a wide spread plague in the us, for use of ecological destruction of farmland to cause economical damage etc...
Once you get fire ants in your state it is very hard to get them out. Fire ants are a real sting in the neck by themselves but if they were bred to become more poisoneous, they would seriously disrupt social life.
Smuggling and releasing a handfull of queens would suffice to make a costly (billion$) nationwide program necessary to erradicate an inside job attack like this. Arrange for some other ecological disasters to take place simultanously (like starting a thousands of arsons in the woods coast to coast and releasing hundreds of birds carrying the west nile virus etc) and you present the authorities with a challenge equal to the plagues released by Mozes against egypt, making 9/11 looking like childsplay.
As a matter a fact, all these costly fires we had in australia recently, could for a great deal been ignited by people symphatic to the fundamentalist cause... ???