Sweet corn ("Zea mays" convar. It is a pest of grain, particularly corn (maize or "Zea mays"). This pathogen is an obligate parasite solely of the species "Zea mays". In the prehistoric samples, they found an abundance of "Zea mays" pollen. It is considered a pest on "Zea mays" and "Gossypium". By 4,000 years BCE corn ("Zea mays") and common beans were grown. The annual teosinte variety called "Zea mays mexicana" is the closest botanical relative to maize. Progress in such cases have been recently reported in "Arabidopsis thaliana" and "Zea mays". It is a "Zea mays" line known as YieldGard from the company Monsanto. Some strains of corn (taxonomized as "Zea mays") are cultivated specifically as popping corns. Barbara McClintock first described the "nucleolar-organizing body" in "Zea mays" in 1934. It is the major anthocyanin in purple corn ("Zea mays"). Popcorn ("Zea mays everta", "corn turned inside out") is considered a variant of this type. Corn ("Zea mays") and canes ("Arundinaria" sp.) are the only known hosts to date. "Zea mays" is the predominant type of corn used to created high-fructose corn syrup.