help! brown spots on buds, yellowing leaves. What am I dealing with?

Hey fellow growers!

The state of my autoflower is deteriorating fast unfortunately.
It started with yellowing leaves about 10 days ago. Tried adding more fertilizer but that didn't seem to help. The plant has been in a greenhouse for 3 days when I wasn't home and it was hot weather, so that has probably aggravated leaf burn and leaf dropping. Yesterday I think I found evidence of thrips, but it could be something else. Now I am also noticing various brown spots on the buds, what could this be, is this spidermite?
I keep the plant outdoors or in a greenhouse, it is now at day 66.
Tonight I gonna treat the plant with a soap-mixture and I ordered some yellow sticky straps. Any other advice? Thanks in avance
 

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