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  #1  
Old 08-16-2018, 06:59 PM
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Default New Bud Onset turning Purple/Gnarly. Totally Ruins Plants. Phosphorus Deficiency??

My friend, and a friend on another forum are both experiencing this problem.

Its NOT COLD, or any kind of Burn.

Im thinking it may be a Cal/Mag/Phosphorus problem.

1 friend has been having this problem 4 years in a row. Lost hundreds of plants. They grow great in Veg, and as soon as they start to flower, they turn purple, and gnarly.
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  #2  
Old 08-16-2018, 08:35 PM
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Sounds like it could be broad of hemp mites. Look at them with a 30x scope or better. They are tiny. Not likely phosphate deficiency, unless you have super acidic soil. You can add super phosphate to test that theory. Or any high bloom liquid plant food that will have a high P content. Like Hawaiian Bud and Bloom, which is 5-50-17 (my brother swears by that stuff).

I grew Zac Purple/Bug Sur Holy and they turn purple just before blooming, even in heat. That is what they do, genetically. They throw purple flowers that bloom late and for a long time, being small at first. They needed to be allowed to bloom a long time and harvested in December.
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Last edited by Big Sur; 08-16-2018 at 08:52 PM.
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  #3  
Old 08-17-2018, 12:53 AM
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No Mites.

Last night buddy gave them

Calcium Nitrate 15.0-0
4-20-39
0-52-34
Magnesium
2 x tsp each in 5 gallons water.

Im guessing its where theyre in grow pots, and were at first using granular fert, like a farmer.

19-19-19
0-0-60
Calcitic/Dolomite Lime
Kelp

The plants have used up all the fertilizer, and my buddy was a bit slow to feed them.

Its hard to feed them as weve had a huge amount of rain, and the pots get rained on, thus making him unable to feed regularly, as they cant be fed/watered because all of the rain.

All this moisture has both washed many/all of the nutrients out, along with the soil being wet, causing a PH problem, and also considering they also probably need more lime again, as they've been in the pots now for over 3 months. But the soil test good. 6.3, but is probably low on Calcium/Mag, which can also muck with the P uptake. So he gave them a good dose of everything

Im hoping he can get them a regular feeding. He should probably give them organic, and wouldn't be as reliant for them to dry out some, before feeding/watering with chemicals, but it is what it is for now.

But still would like opinions.
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Old 08-18-2018, 12:19 AM
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Iíve seen this a few times over the years but only a branch here or there on an otherwise healthy plant. Sorry Iím no help but curious what others think. Almost black/purple and a narrowing/deformation of the leaves in the instances Iíve seen.
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Old 08-18-2018, 01:01 AM
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Quote:
Originally Posted by OGL1 View Post
Iíve seen this a few times over the years but only a branch here or there on an otherwise healthy plant. Sorry Iím no help but curious what others think. Almost black/purple and a narrowing/deformation of the leaves in the instances Iíve seen.
Yep. Sounds like what my buddy has.

Ive also been alerted to a malady called.


Phytoplasma


Phytoplasmas are obligate bacterial parasites of plant phloem tissue and of the insect vectors that are involved in their plant-to-plant transmission. Phytoplasmas were discovered in 1967 by Japanese scientists who termed them mycoplasma-like organisms (MLOs).[2] Since their discovery, phytoplasmas have resisted all attempts at in vitro culture in any cell-free medium; routine cultivation in an artificial medium thus remains a major challenge. Although phytoplasmas have recently been reported to be grown in a specific artificial medium, experimental repetition has yet to be reported.[3] Phytoplasmas are characterized by the lack of a cell wall, a pleiomorphic or filamentous shape, a diameter normally less than 1 μm, and a very small genome.
Phytoplasmas are pathogens of agriculturally important plants, including coconut, sugarcane, and sandalwood, in which they cause a wide variety of symptoms ranging from mild yellowing to death. Phytoplasmas are most prevalent in tropical and subtropical regions. They are transmitted from plant to plant by vectors (normally sap-sucking insects such as leafhoppers) in which they both survive and replicate.
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  #6  
Old 08-19-2018, 05:07 AM
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Quote:
Originally Posted by 59lespaul View Post
No Mites.

Last night buddy gave them

Calcium Nitrate 15.0-0
4-20-39
0-52-34
Magnesium
2 x tsp each in 5 gallons water.

Im guessing its where theyre in grow pots, and were at first using granular fert, like a farmer.

19-19-19
0-0-60
Calcitic/Dolomite Lime
Kelp

The plants have used up all the fertilizer, and my buddy was a bit slow to feed them.

Its hard to feed them as weve had a huge amount of rain, and the pots get rained on, thus making him unable to feed regularly, as they cant be fed/watered because all of the rain.

All this moisture has both washed many/all of the nutrients out, along with the soil being wet, causing a PH problem, and also considering they also probably need more lime again, as they've been in the pots now for over 3 months. But the soil test good. 6.3, but is probably low on Calcium/Mag, which can also muck with the P uptake. So he gave them a good dose of everything

Im hoping he can get them a regular feeding. He should probably give them organic, and wouldn't be as reliant for them to dry out some, before feeding/watering with chemicals, but it is what it is for now.

But still would like opinions.

Hi. Hope it's worked out soon.
If it is cal:mag deficiency, would the other leaves show tip burn? Like mineral OD.
The plants look really nice. Until they don't.
Could it be botritis in the tip. From the rain.
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  #7  
Old 08-19-2018, 05:15 AM
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Calcium and magnesium are fairly mobile in the plant.
You would notice the deficiency lower down in the plant. Zinc lock out looks similar.
But those plants have hit the wall.
Good luck.
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Old 08-19-2018, 09:19 AM
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Nitrogen is highly soluble and will easily leach from the soil. Nitrogen is also highly mobile in plants, so they will move nitrogen to the new growth from the old leaves sacrificing them if they get low on nitrogen. Cannabis plants are heavy nitrogen feeders this time of year (in the northern hemisphere, anyway). P and K and iron are more fixed in soils, and may be bound by soils. They are also not as soluble. If you have acidic soil, phosphates become locked up by metals in the soil and will not be as available to the plant. In which case add super phosphate (or rock phosphate). Or some high P fert. If the soil is alkaline the soil will bind iron, and any iron in the soil will not be available to the plant. In which case you need to add chelated iron. Iron deficiency is indicated when new leaves turn yellow. Nitorgen deficiency is indicated when old leaves turn yellow. This is with any type of plant, not just Cannabis.
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  #9  
Old 08-21-2018, 01:49 PM
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2 more photos from a buddy on another forum.
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  #10  
Old 11-18-2018, 10:28 PM
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Wonder if it could be a boron issue but that causes bronzing not purpling...

I'd say ph issue. P locked out....lol. like big sur is getting at

Last edited by Joker; 11-18-2018 at 10:32 PM.
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