BioSafe ZeroTol 2.0 Algaecide, Bactericide & Fungicide, 2.5 GallonZeroTol 2. 0 Broad Spectrum Algaecide Bactericide Fungicide ZeroTol 2. 0 works on contact to kill plant pathogens and their propagules, including spores. Formulated with our powerful and stable peroxyacetic acid chemistry, use ZeroTol 2. 0 starting at propagation through production to protect crops, including fruits and vegetables. ZeroTol 2. 0 is effective against the following pathogens Algae Alternaria Anthracnose Aphanomyces Bacterial spots and