Do white spores have to be visible for it to be late blight?

[Chervena_chuska]

So now, we've just had the 96 degree heat wave that the East is suffering through now with ridiculous humidity and some of my inconsequential fungal disease is all of the sudden looking consequential indeed.

I took some samples to my county extension gardener walk in desk and the gardening expert wasn't worried about the things I thought might be trouble (bacterial problems). She did say one of my plants looked like it had phytoplasma and another of my samples looked suspiciously like late blight due to the dark green lesions. Egad!

I have sprayed a few times with copper and neem and Serenade and have been diligently pruning the low and sick looking parts of the plants, but this kicked in the panic button for me. I pruned off even more of the sick looking foliage and sprayed with Daconil. However, they are dark green lesions (mostly at the tip of the plant) which don't look like late blight to me. Some of them seem to be like marginal burn. They don't look greasy and I keep checking for white spores and find none.

Do white spores HAVE to be present to diagnose late blight? We are expecting a lot of rain now (last night) and the next few days and I checked right away this morning to see if there was any white fuzz and there was none.

Here's a couple photos from two days ago. I'll try to post another later today.