Leaves curling and turning black in flower

hey all
I'm growing in dwc....ppm 1070...ph 5.7... temp 70... my girls lower leaves are starting to curl and blacken like in the pics... I'm only noticing it underneath the canopy... could it be lack of light or is it possibly something else? Any ideas are greatly appreciated!

Hollatchaboy said:

hey all
I'm growing in dwc....ppm 1070...ph 5.7... temp 70... my girls lower leaves are starting to curl and blacken like in the pics... I'm only noticing it underneath the canopy... could it be lack of light or is it possibly something else? Any ideas are greatly appreciated!

Click to expand...

Btw... she starts week 7 of flower tomorrow

The healthy leaves look nutrient burnt have you noticed a slow down in growth? May be nutrient locked you should try keep the ph above 6

They're a lil burnt... I'm using Lucas formula 8/16... growth seems normal and she's definitely eating...i was led to believe ph should be between 5.5 and 6.5 for dwc... with a slow drift up and 5.8 being the sweet spot. She's doing it to a leaf or two a day. I have some larfy light green growth on the bottom it seems to affect more.

Pics of Larfy undergrowth...