my strawberry has a cough, help!

[weatherboxes]

So the lower leaves of my strawberry cough have been yellowing with some brown/black spots... no idea whats going on really.. i answered what i could and posted some pics. i thought it wasn't a problem until overnight it seems to have moved on to the upper growth and now im worried because its only week 2 of flowering. any thoughts or suggestions on what to do would be great~!
SOIL:

How long has this problem been going on? started on the lowest fan leaves about a week ago
What STRAIN are you growing? strawberry cough
What was the establishing technique? (seed or clone?) fem seed
What is the age of your plants? around 8 weeks
How long have they been in the soil mixture they are in now? around 5 weeks
How Tall are the plants? a little over 2ft
What PHASE (seedling, vegetative or flower) are the plants in? flower
What Technique are you using? (SOG, SCROG etc) LST
What size pots are you using? 1 plant per 3 and 1/2 gallon pot
What substrate/medium are you using? What brand of soil mixture are you using? ffof, lime, worm castings, and extra perlite
What Nutrient's are you using? pura vida bloom & organic molasses
How much of each nutrient are you using with how much water? 2tsp/gal
How often are you feeding? nutrients were fed during flowering for the first time almost two weeks ago i haven't fed them nutrients since except 1 tsp/gal of molasses every other watering.
If flowering, when did you switch over to using Bloom nutrients? almost immediately
What order are you mixing your nutrients? all i mix are bloom nutes and sometimes molasses
What is the TDS/EC/PPM of your nutrients used?
What is the pH of the "RUN-OFF"?
What method of pH test was administered? Using Strips? pH pen?
How often are you watering? every three days
When was your last feeding and how often are you feeding? almost two weeks ago... ?
What size bulb are you using? 400w
What is the distance to the canopy? 16-18in
What is your RH Factor? (Relative Humidity) around 50%
What is the canopy temperature? 80
What is the Day/Night Temp? (Include fluctuation range)
What is the current Air Flow? (cfm etc.) 1 oscillating fan and 1 4 in can fan running through the hood
Tell us about your ventilation, intake exhaust and when its running and not running ? always running with two 4in passive intakes
Is the fan blowing directly at plants? yes.. but it oscillates over the canopy and lower growth
Is the grow substrate constantly wet or moist?
Is your water HARD or SOFT?
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water? RO WATER
Are you using water from a water softener?
Has plant been recently pruned, cloned or pinched? no
Have any pest chemicals been used? If so what and when? yes diatomaceous earth about 24-48 hours ago. i dusted it around the plants on top of the soil and around the base of the pots as well.
Are plant's infected with pest's? just a few fungus gnats here and there but they die in the back of the box..



ps. the white stuff on the leaves is just some d-earth that got on the leaves by accident.

 

[weatherboxes]

nothing??? :/

 

[weatherboxes]

bump

 

[nuggetshiner]

You didn't answer the ph ques. It looks like a ph prob causing all sorts of issues.
What is ph going in when watering and what is ph run off?

 

[weatherboxes]

i dont have a ph meter. looks like im gonna have to make a run to the store.. for now should i flush her?
does is look like the ph is low or too high? i only added about 1 tbsp of dol lime per pot.

 

[Dr Herbivore]

She looks like she needs some food man, just give her a normal feeding once a week, should be chill.

 

[nuggetshiner]

I wonder what happened to the Infirmary mods?
Hey wb, a ph pen is a staple in my garden. I used drops for a couple years and that works
fine but the pen is quicker and more accurate. It's hard to determine whats wrong with a
plant if you don't know ph going in and coming out (runoff). Won't help to flush a plant
with unknown ph water, you could do more harm. You can get ph kits at hydro or pet
store. I'd be happy to try and help if I can (you can check my albums for my grow skillz).
Once you know your ph you can move on from there. Sorry I don't have a quick fix for
ya but it just doesn't work that way.
ns

 

[weatherboxes]

so i flushed her and her ph was barely low so i stabilized it with a little bit of lime. however my test strips were for my jacuzzi and kinda old so im not sure if they were very accurate. the waters ph (7.2) was almost the same to the run off (7.4). so after this i decided to feed her since it had been two weeks. she looks very healthy as far as pistils and bud production go. i havent seen this many big thick pistils this early in flowering before. it is only the fan leaves that are still slowly getting worse.. i dont know what to do at all anymore.. except maybe order jorge cervantes grow book.

 

[rollthediceagn]

I know i'm a newbie to this site but after 14years of doing this and lately a ton of Strawberry Cough it appears that they are in need of feeding my friend. I have 37 of them going at a time and have been thru this as well so i just thought i'd pass it on to ya. What's your drainage like in your containers/medium? That plays a big part in things too. Sure those test strips are actually pretty dang accurate to be honest but you really need to think about a Ph Pen type tester and you should really have a ppm tester as well especially in any Hydro method.
I'm sure many people have many other bits of advice on this and believe me I welcome any of it.LOL Please realize I am only basing my advice on personal experience with this strain. No 2 are alike trust me. No 2 grow alike. That's part of the beauty of this wonderful Plant in that it offers so much variety. Hope maybe some little thing I have said may help.
Thanks,
dice

 

[weatherboxes]

alright cool dice they probably just need some respond time cause i just fed them a few days ago. like i said the pistil growth is optimum still. im going organic so the ph is pretty hard to mess up. ill just increase the feeding frequency and maybe up it by a tsp. thanks again.

 

[weatherboxes]

the leaves are still getting yellower and now they are disclolored by the top of the colas.. i can feed for another 5 days for me to stay on schedule.. any suggestions? should i just feed her tomorrow? i just fed her 4 days ago..

 

[Snype]

What's your PH?

 

[weatherboxes]

7.2ish

 

[Snype]

I would drop the PH down to 6.5 for Soil