HELP! Plant not doing well.

[Mare]

I’ve been growing outside (in pots) for several years and have never really had any issues. All of my current plants ( auto flowering) are extremely healthy, budding and looking quite happy except for one. The tops are starting to droop and and some of the newly formed buds have turned brown. Root rot or mold perhaps? Love to hear your thoughts as need to remedy. Thanks in advance.

FYI… you may see some white residue .. that’s just some Diatomaceous powder I used for potential spider mites

 

[9fingerleafs]

That's due to caterpillars. They poop and it creates mold and rotting

 

[Rwise]

Look up what happens to DE when burned.

 

[Bluey]

Those buds are really small to attract bud rot but that is what it looks like to me.

Never put anything on your buds either.

 

[Mare]

I only powdered lightly once thinking it maybe spider mites. Didn’t to my other plants. Again just when they first started showing the droop plus buds were extremely small.