CAT and infection: The content of H2O2 did not change in the first three days of infection compared to the control, PO activity began to increase 24 hpi and greatly increased 72 hpi, and CAT activity increased by approximately two times 24 hpi and was at the control level 72 hpi in resistant (SnTox1-insensitive) cultivars (M808, Zhn) (Figure 3).