I'm visiting parents in Hawaii and helping them start a greens garden like the one I have in Seattle. I planted chard, kale, pak choi, and collards. The Tuscan Kale, despite being a hardy plant, was being destroyed by something. I found caterpillars under the leaves one night, so I started a spray treatment of neem oil/mild detergent. Since then, no caterpillars seen, but the plant now exhibits brown spots almost like "burning". It is obviously hot here in Hawaii during the summer, but it's watered adequately.
Another tidbit: their clay soil is crap so I added ratios of Amend, compost, chicken manure pellets, planting mix, and a bit of Oscmocote pellets for fertilizer. Is it possible I overdid the nutrient additions to this already established plant? the seedlings aren't suffering. Also, the chard, zucchini, red kale, and others are doing fine. Just this one tuscan Kale.
I picked off the burned, hole ridden leaves today.