1st timer needs a hand

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Something is going wrong with one of my plants and I have no idea what it is. It started at the base of my plants and spread up. I'm doing an outdoor soil grow in 5 gallon buckets the soil is miracle grow moisture control potting soil with mycro, blood meal, bone meal, bat guano, dolomite lime. I tested the soil pH and it is 6.2 I feed fox farms 2 tsp tiger bloom 1 tsp grow big per gallon of H2O. I feed once the top inch of soil is dry so roughly 3-4 days. I use captain jack as a pesticide and have used safer soap once before.

Looks like they are nute burned, heat stressed, or underwatered. Are you just feeding every time you water, or are you doing plain water then feed and so on?

Miricle grow with myco? Chemicals kill organisms. Pick one, chemical or organic.