As usual, I'm rambling and not being very coherent.
My question was leading up to focus on when spraying fungicide and preventives.
I mean I already mostly just do the milk and AACT alternating weeks, IF I do them at all. (I guess I use rubbing alcohol spray on pruners and larger pruned branch cuts.)
This year, I sprayed milk once, have not been able to get AACT going due to my compost in the middle of the bed experiment not allowing for turning the two piles in separate beds. (The one in the middle of the corn is a lost cause -- have not even added to that one....). I might be able to scrounge up some finished compost from the bottom access of the Kitchen Garden compost bin soon.
So all I have been doing all season is cutting off and disposing of spotted leaves as they appear on cucurbits and tomatoes. ...just got me wondering...
Also, the russet mite situation -- full on infestation, the plants nearly dead, then some plants that didn't completely go down showing new growths with no visible signs of infestation. I didn'tt do anything with them except to move the container plants around hoping the Garden Patrol will take notice and take care of them. Those things are basically invisible (without high power magnification) and, in that sense, closer to the microbes -- fungi and bacteria -- in terms of our awareness and perception.
Oh, oh! I also tried WILLOW TEA because. I felt. I HAD to do something for the ground-planted tomatoes with russet mite infestation. Some UK studies were posted on another forum that aspirin dissolved in water and foliar sprayed can activate or strengthen plant immune response. Well I don't keep aspirin in the house, and that's what I'm letting a volunteer willow grow for, so I chopped up bark and branch tips -- I can't remember which is which but one of them contains the correct compound -- and steeped them in rainwater.