Brown spots, high ph?

[dumpypony]

Little help for a newbie? I have an outdoor grow in a Northern latitude, somewhat sandy soil by a flowing creek. Plant seems basically healthy, but with some brown spots and browning/yellowing on some lower leaves. Soil PH is 7.2, what should i do to get it down? I've been feeding it organic fish fert diluted in water during veg, and have switched to organic bloom fert now that it is blooming. Have I overfertilized, or something else? The brown spots don't seem to be insect damage, I haven't seen any bugs.

Thanks so much!

[stinkyattic]

That plant looks good. What you are seeing is insect damage. A light application of neem or hot pepper wax to the leaf surface will help repel those bugs.

[dumpypony]

Good news, thanks, I'll do that. Do you think the high PH (7.2 or so) needs fixing?

[stinkyattic]

Well, I'm not seeing any of the problems associated with high pH lock-outs, so I'd say that unless you see deficiency symptoms, you are okay.
Next time you go out and water, you can bring a gallon of water that has been adjusted to pH 6.5-6.8 with cider vinegar- don't add nutes to this solution, as they may interact en route to your site.