Progress advice leaves and tips

dnoob

Member
I been worried about the looks of some leaves, some going purplish and some yellowing fast...I am at day 42 in flowering, growing purple kush in soil.
Some leaves gone yellow and tips dark brown, they are 013.jpgfalling on their own.
I know i have either gnats or winged aphids flying around, i was going to treat with azamax but held off to feed them gir005.jpgls first since am also worried about a nute problem.
Questions, should go ahead and treat with azamax this evening, hold and bite the bullet or004.jpg delay the treatment.
Is the yellowing/browning of tips normal at this stage or not, if not what could it be, a combo of bugs and nute problems008.jpg,,,what do you guys think this plants will yield from what you see on the pix, buds are really nice but seem have slowed their grow quite a bit001.jpg...Any advice is very much appreciated.

Apologies if i didnt post correctly, Dnoob :)
 
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