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Need help diagnosing issue with plant.

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Need help diagnosing issue with plant.

757Botanist 46 Replies 3,373 Views
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757Botanist

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#1
Hey fellow farmers. My outdoor grow is going well. 4 plants in rotation but one is showing some funky signs. I water with rainwater and fertilize with TPS 3 in 1 and also with TPS bud hardener since they are in preflower. The leaves are turning yellow with brown spots. I do a gallon of water mixed with 5ml of the 3in1 and 5 ml of the Bud hardener. The other three are fine but this one plant is driving me crazy.
Need help diagnosing issue with plant
 
#5
LoveGrowingIt said:
The plant looks healthy. I think it's beginning to get ready to flower, so it's getting hungry. It needs vegetation nutrients for the stretch and is starting to need flowering nutrients. Calcium and magnesium would help, too.
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Thanks! I was freaking out a bit but I will do a couple more weeks of the 3 in 1 bc that has the NPKs the plants need.
 
#6
757Botanist said:
Thanks! I was freaking out a bit but I will do a couple more weeks of the 3 in 1 bc that has the NPKs the plants need.
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Is your 3 n 1 a one bottle nutrient program? If so, we might want to look deeper into the TPS nutrient line-up. Your plant is about to go through high amounts of calcium and potassium. @LoveGrowingIt already suggested calmag and I'm going to suggest a potassium sulfate boost. I believe TPS has one called "Signal." You'll need those boosts as you head into flowering.
 
#7
RoadKillSkunkHunt said:
Is your 3 n 1 a one bottle nutrient program? If so, we might want to look deeper into the TPS nutrient line-up. Your plant is about to go through high amounts of calcium and potassium. @LoveGrowingIt already suggested calmag and I'm going to suggest a potassium sulfate boost. I believe TPS has one called "Signal." You'll need those boosts as you head into flowering.
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Yes the 3in1 is one bottle but I will go back to the website and look up Signal. I did see that. Luckily their products can be mixed so hopefully that’ll do the trick. I already have some calmag but let me check the expiration on it. Thanks 🙏
 
#8
757Botanist said:
Yes the 3in1 is one bottle but I will go back to the website and look up Signal. I did see that. Luckily their products can be mixed so hopefully that’ll do the trick. I already have some calmag but let me check the expiration on it. Thanks 🙏
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This graphic should help you see why we're suggesting what we are. Calcium needs go sky high about the second week of flowering. Potassium needs go sky high shortly after that. Now is the time to get both in hand as you head into flowering.

Nutrient requirements by week of life
 
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#10
RoadKillSkunkHunt said:
This graphic should help you see why we're suggesting what we are. Calcium needs go sky high about the second week of flowering. Potassium needs go sky high shortly after that. Now is the time to get both in hand as you
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Silly question but since the other plants aren’t showing these signs, should I still give calmag and Potassium for preventative maintenance?
 
#11
757Botanist said:
Silly question but since the other plants aren’t showing these signs, should I still give calmag and Potassium for preventative maintenance?
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I would. I'd call it normal plant support in your case. Your plants don't appear to be having real problems so we're going to simply support its growth by providing it what it will be asking for as you head into flower.
 
#12
RoadKillSkunkHunt said:
I would. I'd call it normal plant support in your case. Your plants don't appear to be having real problems so we're going to simply support its growth by providing it what it will be asking for as you head into flower.
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Awesome, just placed order for the TPS Signal, TPS Silica Gold, and the TPS cal mag. Thanks again for the help!
 
#13
757Botanist said:
Awesome, just placed order for the TPS Signal, TPS Silica Gold, and the TPS cal mag. Thanks again for the help!
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Usually a grower will use silica up until about the second to third week of flowering. It's potassium Silicate usually. The signal is potassium sulfate. If you use both at the same time, you could over-do it. Also, the silica has been known to cause burning issues when used through out flower.

Now don't fret your purchase. That Silica will come in handy during your next run. Start giving them some (by the directions) during veg.
 
#15
GNick55 said:
you better research septoria and black spot disease,.
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@GNick55 is there something you see that we don't? I've never personally dealt with either one of those issues so all I know is what I've read which isn't much.
 
#18
RoadKillSkunkHunt said:
How would you treat it? Something like Southern Ag's Garden Friendly Fungicide? I don't have first hand experience with this ... tell us what you can and I'll research the rest.
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never dealt with it,.
but it can turn real bad real quick and that plant looks to be early in the infection,..
 
#19
RoadKillSkunkHunt said:
How would you treat it? Something like Southern Ag's Garden Friendly Fungicide? I don't have first hand experience with this ... tell us what you can and I'll research the rest.
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just google cannabis septoria black spot
 
#20
GNick55 said:
never dealt with it,.
but it can turn real bad real quick and that plant looks to be early in the infection,..
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This is what AI says about it. I wouldn't use Neem oil this close to flowering but the rest seem like a solid path

Treatment & Prevention Steps​

  • Remove infected leaves to reduce disease spread.
  • Increase air circulation (use fans, thin foliage) to decrease humidity.
  • Reduce overhead watering to keep leaves dry.
  • Apply an organic fungicide (neem oil, potassium bicarbonate, sulfur-based) safe for cannabis if fungal infection is confirmed27.
  • Inspect for pests under leaves with a magnifying glass to rule out mites or other insects9.
  • Monitor nutrients but prioritize fungal management if distinctive black spots with halos dominate the symptom pattern.
 
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