Is this a Calcium Def?

[Kreat]

SOIL:

How long has this problem been going on? Since put into flowering 2 weeks ago
What STRAIN are you growing? AK47
What was the establishing technique? (seed or clone?) Clone
What is the age of your plants? 6-8 weeks
How Tall are the plants?2 ft
What PHASE (seedling, vegetative or flower) are the plants in? flowering
What Technique are you using? (SOG, SCROG etc) breaking branches
What size pots are you using? (Include how many subjects to pot)3 gal
What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?) 50% Promix Bx 50% Coco Coir
What Nutrient's are you using?How much of each with how much water? How Often? *Knowing the brand is very helpful* Floranova Bloom. I feed them 7mL at 6.0-6.2 every other day, and just plain pHed water otherwise
What is the TDS/EC/PPM of your nutrients used? 1000
What is the pH of the "RUN-OFF"?6.2
What method of pH test was administered? Using Strips? pH pen? Pen
How often are you watering?Every 3-4 days
When was your last feeding and how often are you feeding?Feeding every other watering, last feeding was 3 days ago.
What size bulb are you using?400 Watt HPS
What is the distance to the canopy?1.5 ft
What is your RH Factor? (Relative Humidity)65%
What is the canopy temperature?83 F
What is the Day/Night Temp? (Include fluctuation range) Day 88 - Night 75
What is the current Air Flow? (cfm etc.)465 CFM Vortex
Is the fan blowing directly at plants? no
Is the grow substrate constantly wet or moist? no
Is your water HARD or SOFT? its 100 PPM and 7.4 pH
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water? tap
Has plant been recently pruned, cloned or pinched? pinched and pruned
Have any pest chemicals been used? If so what and when? nope
Are plant's infected with pest's? no

 

[master shake]

do you have a full pic of the plant? Are the tips of the leaves brown? the ppms look high and you may be over feeding.. could very likely be a cal def because it looks like you havent added anything to suffice. mix in some dolomite lime in your coco mix in the future, and cal probably won't be an issue.

 

[rootfingers]

I would say you are right about it being a cal deficiency, at least I treat it as such when I see those spots. I usually hit mine with an extra dose of cal/mag when that happens. Also I sometimes give them some Mineral Matrix when I see deficiencies creep up like that just for the peace of mind. GL.

 

[Kreat]

There is no browning tips on the leaves only these spots that you see here. They look completely healthy otherwise.

Root- How much cal/mag do you think I should give them? I have a bottle of it but last time i used it, I over used it, so I stopped. Any recommendations are accepted Thanks!

 

[knna]

It could be a Ca deff, but we need pic of the full plant, and to know from where you chopped the leaves (top, medium, bottom).

I dont have experience with soil/coco mixes, but i thought you may use a soil ph with them. Maybe is 6-6.2 too low?

Or maybe, next time, you may buffer the coco with a Ca-Mg solution before mixing with soil.

 

[stinkyattic]

Looks more like the damage that occurs when potassium is locked out by low pH, but I also see evidence of pest damage.
Look closely, especially at the veins of affected leaves- do you see any tiny creatures that look like a tan colored splinter scurrying around? Looks like the damage from thrips. And if that is the case, it is entirely possible that the brown speckles are scarring from older damage.
Thrips pupate in the soil. One way to approach this is to cover the soil surface with a paper plate with a slit cut to the middle to slide over the stem. This prevents the larvae dropping onto the soil surface to mature. Their life cycle takes 4-5 days to complete. You may also bomb with pyrethrin, twice, 4 days apart, to kill exposed life stages.

 

[Kreat]

The leaf i pulled was from the middle of the plant. I'll take a closer look tonight when the lights go on. Ill also take a picture of the entire plant so that you can get a better look at the entire plant.

 

[Kreat]

Looks more like the damage that occurs when potassium is locked out by low pH, but I also see evidence of pest damage.
Look closely, especially at the veins of affected leaves- do you see any tiny creatures that look like a tan colored splinter scurrying around? Looks like the damage from thrips. And if that is the case, it is entirely possible that the brown speckles are scarring from older damage.
Thrips pupate in the soil. One way to approach this is to cover the soil surface with a paper plate with a slit cut to the middle to slide over the stem. This prevents the larvae dropping onto the soil surface to mature. Their life cycle takes 4-5 days to complete. You may also bomb with pyrethrin, twice, 4 days apart, to kill exposed life stages.

You hit it on the button. There are some small white larvae walking on the bottom of my leaves. I fucking took in a friends plants since they got caught and thats where they must have come from.

I dont have paper plates, but I have plenty of large plastic bags. so i'll do that for now. Thank you all for the comments, ill try to keep this up to date.

 

[Kreat]

Ive chopped one down early becuz i wanted to make it easier to get rid of them, and I'm cutting down the two that i brought in tomorrow. This will make it much easier to handle the problem I think.

Is pyrethrin safe to use in a room where people are often in?

 

[stinkyattic]

Ive chopped one down early becuz i wanted to make it easier to get rid of them, and I'm cutting down the two that i brought in tomorrow. This will make it much easier to handle the problem I think.

Is pyrethrin safe to use in a room where people are often in?

Be careful with plastic bags- you want to LOOSELY cover the tops of the plates but still allow air flow. Even a piece of white paper works fine.
Pyrethrin is very safe. Give it a couple hours to dissipate before working in there again, but it's an extract of a plant in the Chrysanthemum family (red painted daisy, I believe). It also works well, and I would actually not chop plants early just because you have thrips. They can be controlled pretty easily, and in small numbers don't cause damage worht worrying about- although of COURSE you want to kill off the whole population, which you can do easily when your harvest is all in and you can bomb the room with a pair of Raid bombs and not worry about the plants.