In a statement the Big Ten Conference released Tuesday Afternoon. The conference has announced the postponement of the 2020-2021 Fall Sports Season which includes all regular season contests and tournaments.
From the statement "In making its decision, which was based on multiple factors, the Big Ten Conference relied on the medical advice and counsel of the Big Ten Task Force for Emerging Infectious Diseases and the Big Ten Sports Medicine Committee."
Here is the statement from the Conference via this link.