Sunflower Stem turning brown

Singapore, Singapore

Hi
What is happening to my sunflower, the stem is turning brown and the leaves are yellow. Thanks for your advise

Thumbnail by Judycgk Thumbnail by Judycgk
Mesquite, TX

Overwatering perhaps?
Or possibly one of the many tiny multi-legged varmits that lay an egg on the stem with the subsequent larvae burrowing into the stem of the plant i.e.: somewhat like squash vine borers.
Just guesses on my part.

This message was edited Aug 29, 2018 12:30 PM

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