Yesterday, I took a walk through the yard and found one of my Jak trees looking pretty terrible. Looks like the rain we had has claimed a victim. We had no rain the past two days and the tree looks totally drought stressed. I sent the pic to friends and the consensus phytophthora. This morning I drenched and foliar sprayed with K-phite, which is the same as agrifos or plant doctor. To me the tree looks pretty bad, maybe past the point of no return but I have no experience dealing with this.
My questions for those with experience treating infected trees are:
Should the tree be removed to avoid the accidental infection of other trees?
If no, is it possible to keep an infected tree healthy and productive with continued treatment?
How frequently does an infected tree require treatment?