Bright white spots and some brown spots?

[Markmandude]

The plant (Swiss Cheese) was healthy as can be until a windy night I brought it inside for a few hours. Took it back outside and noticed white spots all over one side, these have been spreading for the past few days, 2 or 3 fan leaves also have brown spots and the leaves are curling up!

I have no idea what this is. The brown spots could be PH problem from what I can find but I haven't changed feeding or water or anything.

I've got a bottle of pesticide coming tomorrow hopefully it may do something, unfortunately I've looked over all the leaves and can't see a single bug. Getting worried now.

Feed is Biobizz grow and bloom, full strength every watering.




Does anyone have any ideas?

Cheers!

 

[carokann]

hey i just got the same exact thing though not quite as bad as you. it happened within 1 day after i did some major gnat work. maybe we did somthing in common. i sprayed heavily with neem oil and dish soap both plant and soil. i covered with thick layer of greensand and dolomite lime. did you do any of those? im thinking its either oil burn from the neem, or it is a magnesium deficiancy. i might try epsom salt.what u think

 

[Markmandude]

Hmmm interesting. It's funny you should say that, as I did spray of my other plants with some strong insecticide the day before this happened, although not this one and they where a good few feet away so none could have reached this plant. Bit too strange to be a coincidence. Also I fed a teaspoon of epsom salt to her a few weeks back as I heard that biobizz is lacking in magnesium, but can deficiencies show THAT quick? Like overnight?

The rain has been non stop here which isnt helping but as soon as it stops I think I'll try a blast of this new natural insecticide stuff and another teaspoon of epsom salt.

 

[Markmandude]

This is a long shot but I've just realised something, as we've had a draught here (before the rain) our water supply was coming from a different reservoir for the past few days... this could perhaps account for a drastic change in PH. (I have no way of checking)

Doesn't lime in your soil adjust the PH? Perhaps we've both knocked our PH out.

 

[spookz1]

i got the same problem but it aint with my cheese its with an unknown strain i randomly planted from a bag of medicanal smoke heheheh but one day it was fine next day it was like it was being choked to death but theres no bugs or that and ph is fine started with like light spots then turned really dark then went yellow and died all in a day now its spreading to all my colas on that specific plant but my swiss cheese looks wonderful after about 7 weeks flowering nearly on the home RUn !!!

 

[Markmandude]

i got the same problem but it aint with my cheese its with an unknown strain i randomly planted from a bag of medicanal smoke heheheh but one day it was fine next day it was like it was being choked to death but theres no bugs or that and ph is fine started with like light spots then turned really dark then went yellow and died all in a day now its spreading to all my colas on that specific plant but my swiss cheese looks wonderful after about 7 weeks flowering nearly on the home RUn !!!

Glad to hear they're looking good . Not so good about what's happening to the other plant. I've just inspected them and they are turning brown as the day goes on. They start of as tiny white pinpricks then spread into large white spots then they go yellow and then brown then the whole leaf dies, exactly what you described. Shit I hope I can get this sorted before it kills it off.

Cheers for the replys

 

[trichlone fiend]

...looks like leaf hoppers to me. Go view this site for pics of plant problems >>> http://www.ganjaguerrilla.net/

 

[jack the beanstalk]

It's cold stress I believe. You said it is on one side and the wind was blowing harder than normal.

Anyway, if it's not worsening I wouldn't worry. The plant looks fine.

 

[carokann]

hey i think i found our answer. When you have too much Potassium in your soil, it can lead to big troubles, like salt damage and acid fixation of the root system, as well as too much potassium can cause a calcium deficiency. Your fan leaves will show like a light to a dark yellow to whitish color in between the veins. Due to a molecular imbalance, potassium toxicity can cause a reduced uptake and lead to the deficiencies of Mg, and in some cases, Ca. Also leads to the other nutrients to not be absorbed properly leading to lots of other deficiency such as: magnesium, manganese, zinc and iron and can cause problems with calcium as well.
http://www.thctalk.com/cannabis-forum/showthread.php?37-Potassium-(K)

 

[carokann]

i gave my plants some bone meal and i bet that has alot of calcium which locks out magnesium. im gonna spray epsom salts.

 

[trichlone fiend]

...does anyone else think this dude has bugs?
...looks like your gowing outdoors, are you using any bugsprays?

 

[Markmandude]

A little bit more information:

The plant is outside in Biobizz All-Mix soil in a 10 gallon pot. A few months old and it's just starting to flower. I have never used bug spray on it as the only problems I've had was slugs. I've noticed the odd few flies hopping about and a couple of large spiders but nothing like what I've seen on here. Something to note is that it's been very humid the past few days after a scorching few weeks.

First thing I did when I noticed was to flush in case it was a nute overdose of some sort, then it rained for a day and a bit. I've decided to just give it a blast and a gentle feeding to get it going again, hopefully I can kill whatever is causing it or at least rule out pests so I can concentrate on fixing deficiencies or overdoses.

Today once the rain stopped I put a layer of sand over the soil and I've ordered some natural pesticide stuff which should arrive tomorrow. I'll give it a good drenching in the stuff and after a few days I'll remove the sand and start feeding it again.

Cheers for the replies everyone. Please cross your fingers for my baby

 

[carokann]

im almost positive its not bugs, but it might be related to you trying to eradicate the bugs. did you say that you sprayed them the day before it happened? im a total newb and dont know what to do with bugs. i hate em. i hurt my plants in the process. the fan leaves got hit hardest with the yellow/white blotches. im really wanting to know what the cause of picture 2 is. if you dont find the answer go post the pic on other forums then report back here to tell me. thyx

 

[carokann]

could it be overwatering?

 

[Markmandude]

It's cold stress I believe. You said it is on one side and the wind was blowing harder than normal.

Anyway, if it's not worsening I wouldn't worry. The plant looks fine.

I wish that was the case but it does seem to be spreading each day, I'll be careful in future bad weather though to keep it protected, the least problems the better lol!

could it be overwatering?

I'm pretty sure overwatering wouldn't cause spots like that, just droopy leaves. Overall the plant seems perfectly watered despite sitting in damp soil for a days (bloody rain). Wish this humid weather would go away, it's worrying me that it's related. It should be pointed out that although the other plants are all completely fine, theyre planted in the ground.

...does anyone else think this dude has bugs?
...looks like your gowing outdoors, are you using any bugsprays?​

My pyrethrin insecticide arrived today so I'll give them all a drenching later when the sun goes down and remove the sand day after tomorrow at least that should rule out pests.

The new growth seems OK perhaps pointing towards a deficiency.




So sad!



Noticed today as well that the plant is getting pretty rootbound, I don't have anywhere to plant it though and no bigger pots, would it be worth buying a larger pot to see if it fixes the problem?

Thank you so much for the help everyone!

 

[carokann]

well we both put sand on our pots and that seemed to be the turning point right? i mean i used greensand and looks like you used playsand. i dunno about sand, maybe something better like diatomus earth or perlite(not sure if perlite will work) also i noticed we both put the sand over the wet soil, maybe this made it too wet. maybe if we let the soil dry for a week, add the sand or diatomus earth, and wait 4 days before watering aagin. or just little amounts of water. this is a serious problem and we havnt really gotten shit for help here bud.

 

[Markmandude]

well we both put sand on our pots and that seemed to be the turning point right? i mean i used greensand and looks like you used playsand. i dunno about sand, maybe something better like diatomus earth or perlite(not sure if perlite will work) also i noticed we both put the sand over the wet soil, maybe this made it too wet. maybe if we let the soil dry for a week, add the sand or diatomus earth, and wait 4 days before watering aagin. or just little amounts of water. this is a serious problem and we havnt really gotten shit for help here bud.

Aye, I'm going to remove the sand tomorrow, only layed it yesterday but I don't think it's gonna help with this weather. Hopefully this insecticide stuff I got will kill whatevers causing it. If it makes no difference then I'll bring the plant inside to dry off (wish the rain would stop!).

Just noticed dark brown spots appeared on my other plant!!! That ones in the ground! These get by on very few feeds and very little watering and it's too much of a coincidence these spots have just appeared if it was due to a deficiency. Now I'm fairly certain it's either pests/disease or something to do with all this high humidity and too much water. Not much I can do about the latter!

I feel your pain man, it's not nice

 

[hempstead]

Looks like nute burn. Flush and let it sit til it is dry.

 

[carokann]

hey mark, do you think we should leave the leafs that are burned on the plants because it looks like if i remove them the lower leafs wil get more light, maybe its a natural plant response to get more light to the lower leaves. do you remember boefre it happened did you spray them with water and it was really hot and sunny? like water droplet magnification

 

[Markmandude]

Looks like nute burn. Flush and let it sit til it is dry.

It's rained so much the soil must be empty by now, just waiting for it to stop and dry out . Natural flush!

hey mark, do you think we should leave the leafs that are burned on the plants because it looks like if i remove them the lower leafs wil get more light, maybe its a natural plant response to get more light to the lower leaves. do you remember boefre it happened did you spray them with water and it was really hot and sunny? like water droplet magnification

I've read that if the leaf is damaged over 50% you should snip it off as the plant is wasting energy trying to repair it. I'm gonna leave mine on until it's all sorted so I can see if it's getting worse , well I might pull off the brown curly ones. The bleaching effect on the leaves does look like it would be caused by sun burn through droplets doesn't it! But I've never sprayed anything on this plant.

How are yours doing? Fairly certain mine is getting worse, although torrential rains are a more pressing matter at the moment!!