IS this Rust Fungus/Mildew?

Week 7 of flower--these weird brown spots/patches are only affecting one plant (g13 x haze) in a tent with 3 others. Adequate ventilation/ never goes under 65 degrees F or over 81F..stays at about 77-79F with a humidity of 30-44% very very rarely exceeding 60%. The spots have been on the plant for about 2-3 weeks now...only only a section of the plant. The lower plant is unaffected as well as new sugar leaf growth.

Problem with micronutrients, iron seems likely. Wouldn't change anything now.

ANC said:

Problem with micronutrients, iron seems likely. Wouldn't change anything now.

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hmmm ok..makes sense since the plants were a bit underfed (first time).. thanks for the response! Too scared of the fungi! that's only a concern when humidity is high right? cause my room has been pretty damn dry throughout the grow ...sometimes reaching down to 25%

You can normally wipe mold off with your finger.

Those look like tiny brown necrotic spots where the plant wasn't able to make enough chlorophyll also typical of issues with calcium, but the yellow veins is the give away for iron. You will never have one element fuck things up in isolation. They always work in groups

Iron is a catalyst for making chlorophyll