Yellow Powders

Pollen from male flowers, unfortunately. It is not a disease or other "problem", but your plant will make seeds. You can look for male flowers and try and remove them to limit the amount of seeds, or do nothing and just leave it be. For pictures of male flowers, go to week 7 in my diary "cannabis conundrums" and use these as a reference as to what to look for. Hope this helps, Organoman.

There are 28-30 flowers on the plant. This issue only appears on two of them. I check it every day and there was nothing like that until today. Is there nothing to do to save the plant?

Looks like pollen and a nanner. Your plant has hermied. You are also using too much nitrogen in your grow for future. Extra potassium, and phosphorus is needed in flowering and light nitrogen. Sorry about the plant. 😫🌱