Biological weapons are being developed to kill illicit crops of coca, opium poppy, and cannabis in forced crop eradication programs. The pathogenic fungi were developed principally by the US for use in narcotics-producing areas globally; but especially Asia and South America. The agents threaten to legitimize agricultural biowarfare, are environmentally unsafe, and threaten wild plants and agriculture in fragile and biodiverse ecosystems. They also endanger human health and, most importantly, the global ban on biological weapons.