Help needed relatively new grower

[peargrow]

Hi fellas this is a pic of one of my ladies she has several leaves like this near the top of her this is bubblegum photo strain 5 weeks in veg 7-8 flower.

I'm week 4 into flower in autopots in plagron mix tang feeding schedule all of my ladies are looking pretty healthy but this one has quite few leaves like this and one or two of my others have the odd one like this but towards the bottom of them. I wasn't concerned but this one is starting to worry me and I like to educate my self so I can identify these issues earlier from now on.

They are under four 600 HPS about 18 inches from the lights temp about 25 lights on 18 -20 lights off all though couple morning before I had the chance to switch on the radiators temps dropped to 14 but only for a couple hours on 12/12 scheduled

 

[AndyBotwin]

Hey @peargrow, that kind of spotting and yellowing at the top of the plant looks like a standard case of calcium deficiency. I also grow with HPS and have found that I need to up the Ca/Mg when I use TaNg's feeding schedule. If you have similar leaves at the bottom of the plant, that could be magnesium def, which often comes along with the calcium def. Give her a bump of cal mag and you should see some improvement soon.

 

[peargrow]

Thanks Andy appreciate it.

 

[Piotrek506]

Hi, I agree with Andy. This is typical case of calcium deficiency, the lady's need quite a lot of it, especially at the end of flower cycle.
Use cal mag with every watering now, and the symptoms will go away, the affected leaves are not going to get better and the spots are not going to disappear . But new growth shoud not be affected, and the sporting and yellowing so to say should stop. So go with andy's advice and you should be fine....

 

[Waira]

ayuh!! That's the Rx,.... ...thank you Sir Bot's!