This is something that has been floating around in my head for more than a decade now, ever since I was a not-so-spotty undergrad. Why hasn't a group (state or non-state actors) attempted to carry out a biological attack, not on people but on crops/livestock? The Green Revolution has been estimated to have saved a billion people from starvation by increasing crop yields. And widely regarded as the single most important development was the breeding of a strain of wheat with extremely high resistance to wheat rust fungus. but even with such resistance yield losses of 5-20% are considered normal, and losses of upto 50% have been recorded. And now there are strains for rust fungus that have arrisen in Africa in the last decade or so that have been migrating eastwards and may already have reached the Punjab (last source I read was about two years ago and suggested as the rust strains had reached eastern Iran then it was inevitable that the Punjab would be affected soon). Rice blast is another scourge of staple crops and it is estimated that the lost yield to it could feed 60 million people for a year. But there are thousands of individual diseases and millions of strains all of which affect farming. So why has one of the various nutter groups not carried out an attack? The technology isn't difficult to obtain even if you wish to use molecular biology to increase destructiveness etc. The financial impact is obvious. If the agricultural states of the US lost 50% of their wheat harvest the impact around the entire world would be massive. Ditto for Russia, India and China and ditto for rice. Then such an outbreak would no doubt lead to regulation on the movement of agricultural products, further impacting supply to markets, further pushing up costs to consumers and decreasing availability. Then there would be the social impact- hungry people riot, starving people cannot be economically productive. And where hunger reigns, disease follows as malnutrition weakens imune systems. Another question, if such an attack did occur on the mid-west prairies, would the NATO mutual defence clauses apply? Such an attack would clearly be a WME rather than WMD, and I'd imagine it would be a stone bitch to even proove that it had been an attack, never mind find a culprit. Thoughts?