In earlier reports, additive or synergistic increases in effectiveness
were observed by integrating heat therapy with various
chemical compounds (Schirra et al., 2011) which might explain
the pronounced improvement in reducing disease severity by the
combined treatments. However, while sodium bicarbonate showed
marked improvement in its effectiveness when applied at 51.5 C
in combination with preharvest PDIC, comparable results was not
achieved with calcium chloride.