Judging by the size of the buds, it is nowhere near the end of its lifecycle. It is yellow because of a deficiency the plant is sucking nitrogen from your leaves. The plant is working harder to get what it needs, and wasting energy on pulling nutes rather than growing.
A whole plant pic may help.
If you catch them early SNS217 can wipe them out. Natural. Always my first choice before Forbid4F.
https://sierranaturalscience.com/natural-pesticides/sns-217/
Trichromes are just one way of telling a plants maturing, are the calyxes swollen? Hairs starting to redding? Is there a natural fade happening to the plant?
One or all can help to point to a plants maturity. IMO 2 weeks at least. Could easily push that to 3.