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mold can infect seeds, if not mistaken. so... hit or miss i bet. if you can test them out in an isolated way without fear of ruining other plants, sure, try it. If it can cause greater problems, i'd just throw it out. there's no cure for it... even commerical grade fungicide you can't buy (big farms can) only slows it down and is in the range of 25-33% effective... i.e. not very effective, lol. You'll find lots of anecdotal bullshit out there with cures involving milk to potassium carbonate. None of that shit works either. Even if you clean the surface, it'll grow back. parts of the mold's anatomy is below the surface. Spraying this nonsense will do more to spread it on your plant than slow it down. It's going to double in severity every 5-7 days i bet. there's no stopping it. wpm is almost always a matter of poor climate control. if not caused by poor conditions, then you also want to toss it because it is susceptible to disease under normal conditions which would be a bad trait to pass on to offspring.

Are you worried that the seeds will mold as well? I would maybe just try and tough it out. Sprays aren't a good idea even though you're not going to smoke it because it may make it mold potentially faster. Do you have the whole plant seeded out or just this single branch? Id maybe just tough it out and possibly cut the molding branch if there's other seeded areas so that it doesn't spread to the rest of the plant. If it's only on the fan leaves, then maybe cut it off if possible but beware it may spread spores Best of luck