Sick leaves are spreading

[Saaf]

Hi

I have some trouble with my Sweet Tooth and Double Dutch plants. I harvested 3 Sweet Tooth plants 4 days ago, they stod right next to the sick plants, and they where absolutely perfect, no disease or anything.
They where grown under almost the same conditions, exept being in seperate pots.
Been searching the forums and browsed through the complete guide to sick plants, but they seem to have catched more than one thing.
At first it was localised to one set of leaves, but it has been spreading to almost all the other plants.
In the first pot it's 4 SWT and 1 DD, in the 2nd, it's 2 SWT and 1 DD
I have attached some pictures to better explain the problems

How long has this problem been going on? Almost 4 weeks.
What STRAIN are you growing? Sweet Tooth and Double Dutch.
What was the establishing technique? Clone.
What is the age of your plants? 8 weeks (4 weeks veg/4 weeks flower).
How long have they been in the soil mixture they are in now? 5 weeks.
How Tall are the plants? 35-40cm.
What PHASE (seedling, vegetative or flower) are the plants in? Flower.
What Technique are you using? SOGish.
What size pots are you using? 35l pots (4 in the 1st, 5 in the 2nd).
What substrate/medium are you using? What brand of soil mixture are you using? 60% ordinary potting soil / 40% Leca
What Nutrient's are you using? Biogrow, Biobloom, Topmax and Rootjuice.
How much of each nutrient are you using with how much water? 1ml/l Biogrow, 1ml/l Biobloom and 2 ml/l Topmax.
How often are you feeding? Twice a week
If flowering, when did you switch over to using Bloom nutrients? As soon as flowering appeared.
What order are you mixing your nutrients? I mix them all together.
What is the TDS/EC/PPM of your nutrients used? Biobizz specs.
What is the pH of the "RUN-OFF"? 6.5 - 7.
What method of pH test was administered? Pen.
How often are you watering? Every other day.
When was your last feeding and how often are you feeding? I fed them today.
What size bulb are you using? 400w HPS.
What is the distance to the canopy? Around 40 cm.
What is your RH Factor? 20%-40%.
What is the canopy temperature? 27c.
What is the Day/Night Temp? Day 25-28c / Night 12-16c.
What is the current Air Flow? Large airfan.
Tell us about your ventilation, intake exhaust and when its running and not running ? Nothing at the moment.
Is the fan blowing directly at plants? Yes.
Is the grow substrate constantly wet or moist? No.
Is your water HARD or SOFT? SOFT.
What water are you using? Tap water.
Are you using water from a water softener? No.
Has plant been recently pruned, cloned or pinched? No.
Have any pest chemicals been used? If so what and when? No.
Are plant's infected with pest's? No.

Double Dutch

Sweet Tooth

1st pot.

This is how it starts out.

This is how it ends, the leaves turn brown and die.

Some of the smaller buds have their pistils burned.

The 2nd pot

 

[mexilandrace]

leafs indicate you are running out of nitrogen which at this point is not a bad thing really.

The lower burned buds are a concern, I wonder if you let your soil dry out or anything else happened, like a fan stopped working...

how long are those strains going to run total?

 

[skoobie dew]

Add some ventilation & treat your plants with a seaweed based spray.

 

[gmanwho]

there lookling for nitrogen, the yellowing.

the first ST pic,and the " the first Pot" photo, the dark purple stems are pointing towards Phos deficiency. As well as the " this is how it ends " photo, those lesions are pointing towards Phos def as well.

Some of the smaller rust spots are looking like a bit of cal def, but also it also looks like phos def. If the spots where smaller i'd say cal, but because the rust spots are larger then pen tips, im saying phos ef

whether the phos isnt available, or not enough from the nutes. without knowing you EC of the 1 1 2 ratio. it may be time for 2 /2 /3.

MJ is phos hog. but it maybe time to up your nutes as day 28 they should be feeding pretty hard for a few weeks then ramp down.

But without knowing your ppm or EC, or experience with your specific nutes, i still say feed them a little more next time.rty bumping up things 1-2 more mils, especially the bloom nutes. they are in full bloom mode now and wanting that phos. so there pulling it from storage in the leaves, the stems an lower budsites.


Is topmax a pk booster?

See what other think as well. ..

B-safe

 

[junior_grower]

you should be feeding more than that look at the chart by GH
http://www.generalhydroponics.com/genhydro_US/feeding_charts/GO_MYSF-FeedChart.pdf