When the United States renounced its offensive biological warfare program in 1969 and 1970, the vast majority of its biological arsenal was composed of these plant diseases.
Kui Ameerika Ühendriigid 1969–70 enda vaenuliku bioloogilise sõja programmi lõpetasid, oli enamik biorelvadest nende arsenalis just taimnakkuste kujul.