yellow leaves with brown spots

[always stoned]

hi im new to this,its my first grow in the last couple of days 2 plants leaves on the bottom are starting to turn yellow,but this one is starting to get brown dots or stains.its about 8 inches tall its in perlite and vermiculite.its around 19 days old i feed it the a and b nutrients,i hand water them,there under a 6oo watt light 18 on and 6 off.i think i might be mixing the nutrients a bit strong.thanks in advance

[SukonmiSkunk]

increase the amount of times you water...

 

give these a flush to clean the medium and start a fresh.. then at full strength.. about 1600-1800ppm.. water them about 4 times a day...

 

or better still set up an auto feeding recirc system, they will crank then...

[DownUnderDoper]

how hot's it been the last week, is your grow space adequately ventilated?

[always stoned]

i have one exhaust fan up top and two blowing air down below.the temps during the day are around 37 or 38,during the night its around 33 with the air con going in the room,im getting one of those small air cons and putting it in my big cupboard,could i take them out in the fresh air for a few hours a day and then put them back under the light again and keep doing this

[DownUnderDoper]

sure you can, the more light the better, Mother Nature has the best HPS going.. just keep an eye on them because taking them outside will change the watering regime even more

[Oz]

Some pictures would be great but sounds like yellow leaf spot... Trim as much as you can out and maybe give them a boost of phosphorus and potassium

[Radic]

what makes you say dat oz????

imo

crucial take pix

i must see close up of the underside of the infected leaf

first

i hafe rule out insect infestations 100% first

100%

ok

next

 

flush flush flush

 

do you have a book??? or a plan

stick to it

if you dont

then get 1

ok

my advice is to

flush regularly

at least once a week

 

here is a link to diseases ids if yah need

http://www.stormloader.com/aallon/articles...OfCannabis.html

if it is a disease like dat

and you want to save them

you will need to quarantine and treat all infected plants and sterilize everyting in the infected grow room

because it is a bacteria h2o2 will work fine

still

dat is a lota work

do a google search to see what options are available for most horticulturalists

 

irey guidance

[Radic]

38c is way too high

get it down to the mid to late 20ts

ok

ac rulez