5 weeks into flower and yellowing/brown spots

[unknownsoldier]

Hi,

Have a dozen dp Blueberrys 5 weeks into flowering that are having a few problems. A lot of the leaves are starting to yellow and some are developing brown spots on them, wilting and falling off. The more seriously affected plants are the larger ones that are a couple of inches bigger than the others. The yellowing is starting at the bottom of the plants and working its way up. Any ideas what it could be? I'm guessing pH but could it be a nutrient lockout too?

Cheers


E-indoor
E-soil,
E-biobizz light mix


SCLR-Soil or slab runoff pH ....7.3
E-Water source...tap water left to sit for 24hrs
E-Source water pH.....7.0
E-Age of plant 3months, 5th week flowering
E-Type of fertilizer, bio-bloom
E-Rate of application (if hydro, this is your PPM number, preferably after each component is added)...2ml/L 2 to 3 times weekly
E-Lighting source and distance from plant400HPS 18 inches from tops
E-Air temperature (both day and night if you are running a dark period)Day=85 Night=65
E-Air % Relative humidity Day=30 Night=50-70
E-Lighting schedule 12/12
E-Type of ventilation your room has..doors/windows
TR-Did you pre-soak your media in pH corrected solution? no

unknownsoldier Reviewed by unknownsoldier on 07-01-2008. 5 weeks into flower and yellowing/brown spots Hi, Have a dozen dp Blueberrys 5 weeks into flowering that are having a few problems. A lot of the leaves are starting to yellow and some are developing brown spots on them, wilting and falling off. The more seriously affected plants are the larger ones that are a couple of inches bigger than the others. The yellowing is starting at the bottom of the plants and working its way up. Any ideas what it could be? I'm guessing pH but could it be a nutrient lockout too? Cheers :cool: Rating: 5

[unknownsoldier]

bump

[stinkyattic]

Your pH is too high and it sounds like a calcium deficiency or lock out. Get your pH down to 6.7 and give calmag with the next couple feedings, and you should stop the problem from spreading.

[phatsesh101]

at week five flower sounds normal to me i usually get two phases of leaves dying during flower about halfway and about two weeks later on an eight week flower

[unknownsoldier]

Thanks for the advice,just wondering if its the run-off pH that should be 6.7? Probably wont be able to get a proper pH down solution until the weekend, would apple cyder vinegar do the job in the meantime?

Cheers:yippee:

[phatsesh101]

6.7 sounds about right for soil i used to use apple cyder vinegar when i was on my organic kick it works alright so does lemon juice

[unknownsoldier]

Added some vinegar to the water (went down to 6.4 from 7.3) and got the run off pH down to 6.6, hopefully this will help! Took a picture of the plants also :thumbsup:

[unknownsoldier]

Heres one of the sick leaves.

[unknownsoldier]

Adjusted pH but spotting has spread to over half the plants now! Kinda looks like mould, any ideas?

[stinkyattic]

It won't heal, but by keeping the pH and fertilizer level correct, you can keep it from getting worse, and the plants should recover.
Make up a foliar feed that is one quart of tap water, one drop of liquid dish soap, and enough 'grow' fert to make the equivalent of a 1/2 strength nute solution, and lightly mist your plants with that.
Foliar feeding is a good way to correct observed deficiencies while you are trying to solve the problem that caused them.