brick top -- whats up with pistils turning red but glands are clear--- diesel kush - 5.5 weeks into flower - 600w
Without anything else to go on I would say it is genetic. Possibly not normal for the strain but possibly a rare or semi-rare phenotype where it will happen. I do not know what all is in the strain, as in the varied genetics in it, the genetics of the different strains used in the various crosses that took place that eventually led Diesel Kush being made, but my bet is somewhere in the chain of different mixed genetics is a strain where pistils will turn red early, or possibly some other color but the mixed genetics caused yours to be red. Depending on what Diesel strain went into the cross, some have very mixed genetics and like how the families of a friend of mine and his wife had for generations all had black hair or dark brown hair they ended up with two redheaded children, and his son, when he grew up and married, then had a redheaded daughter. Later they found that a great, great grandfather had red hair. The genetics lay hidden deep in the chain and then for some reason it surfaced, it popped back up. Possibly it is something somewhat along the same lines with your plants. If it is somewhere in the chain of DNA at some point it can surface and it can, at least for a while become dominant.
Some people have grown Stinky Pinky and not seen a single pink pistil. I have seen Stinky Pinky with almost every pistil being pink earlier than 5 1/2 weeks.
It might in part be conditions/environment, but my pure guess is that it is genetic.
I grew the real deal Panama Red back in the 70's and Panama Red got it's name because of it's red pistils. It was a LONG flowering strain, mine took 22 week, but they didn't wait until the final weeks for the pistils to turn red. They were not red by 5 1/2 weeks but given the long flowering time, and the flowering time I am assuming Diesel Kush has, the Panama Red pistils likely turned as early, if not earlier, proportionally speaking in relation to overall flowering time.
Normally pistils will remain white for as long as they are still viable for pollination and then change color once no longer able to be pollinated. Possibly your genetics are ones where the pistils only remain able to be pollinated early in flower, though I have never read where that is the case in any particular strain, but it is a possibility.
If they are not shriveling up and instead are standing up firm and proud and sticking out as normal I would not concern myself with it.