Harmful chemicals in the form of toxins are called bio-weapons, produced by various species of Fusarium, Myrotecium, Trichoderma, Cephalosporium, etc.
The chemicals cause very dangerous diseases to human beings such as bloody diarrhea, weight loss, nervous disorders, cardiovascular alterations, immune-depression, hemostatic derangements, skin toxicity, decreased reproductive capacity and bone marrow damage.
Hence, Fusarium is used as a bio-weapon in warfare.