Remember early in the year when we were discussing mycor and the inherent benefits? We came across data that stated how mycorr can lead to an increase in plant processes.
"We have also learned that the often higher stomatal conductance of mycorrhizal leaves is tied to slightly higher water potential gradients across leaves, consistent with the higher rates of gas exchange necessary to supply the carbon needs of the fungal symbiont"
(Augé et al. 2008).
We then surmised that since BLS is predisposed by water stress perhaps mycorr could be a companion treatment along with OTC to help suppress symptoms by diluting the pathogen populations within the plant.
http://www.pubmedcentral.nih.gov/art...?artid=2486461
seems to state that it does not matter the populations of pathogen since "Gambetta et al. (2007) used a highly sensitive detection technique to show that PD leaf scorch symptoms can form even in the absence of localized high concentrations of the bacteria and suggested that plant hormones may regulate such a systemic response."