Rustyness on Fan Leave during mid Flowering!

What type of medium; soil or hydro? Soil
What brand and type of soil? FFOF
Indoors or outdoors? Indoor Closet
What strain? 2 x White Widow and 1 x Blue Cheese
How old are the plants? 34 days into Flowering
What type of lights and how many watts? 600W HPS aircooled
How far from the lights? 12 Inches
What is your watering frequency and source of water? 3-4 days
What, how much and when was it fed? NPK? 3/4 Strength of Big Bloom and Tiger Bloom, FF Cha Ching, 3ml CalMag, and 1 tbsp of Molasses
What is the medium/runoff pH and PPM if in hydro? 6.4-6.7
What are the temps and humidity in the room? 81-84F and 25-40% RH
What size pots? 5 gallon Smart Pots
Any bugs? Look real close. Not that I see



So I am about 5 weeks into flowering and this problem started like a week ago. Lots of the inner middle and bottom fan leaves have been yellowing. And they would fall off.

Now the fan leaves are starting to have these rust spots. I have a 100x microscope and do not find any mites or eggs. Could this be a CalMag or Phosporous deficiency?

Both white widows have kinda dark reddish stems.


White Widow 1





White Widow 2




Blue Cheese



Overall Plants

Bump.......................

I'm no expert, but when I see damage like that on my own leaves, its because there is/has been a cal-mag deficiency.

Ya calmag

Dannoo93

Alright thanks guys, appreciate the advice. I sorta did a mini flush to them. Gave em 8 gallons of water in between the three 5 gallon plants. But I added 50% strength of CalMag to the 8 gallons of water. So hopefully it will help a little.

Heres some pictures of them after watering:

Because of the product cal-mag, we'll never know in these situations what actually solved the problem..... so we just say "cal-mag solved it"..

Was it the cal or the mag? Who the hell knows.

Great looking plants otherwise.