Outdoor grow White Widow, just starting to flower but some Bud sites have these darkened leaves. (The lacy holes in the fan leaves are from bugs, I’m sure.) but what about the darkening? It just started a day ago and the weather has changed. It doesn’t look like botrytis to me. Any ideas?
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White Widow is susceptible to bud rot or fungus when its flowers are half developed. Your plants are at the highest risk with a temperature between 60 and 80 degrees Fahrenheit and a high humidity level. This is one of the reasons why you should reduce humidity levels by the flowering stage.
Are you are feeding additional Calcium, Magnesium and Silicon you could have some pathogens on the attack.
Cal/Mag and beneficial microbes enhance your plants response to the nasty microbes. Silicon helps strengthen the exoskeleton of your.
If you’re getting hot muggy weather without a lot of air movement, pathogens are common to
I’d recommend provide a full picture of your plant including any plants adjacent to this infected plant.
Answer these simple questions the best you can.
If you do not know, or do not use something; Just say so; Or post
NA (non applicable)
-What strain, Seed bank, or bag seed (photo or auto)
-Age of plant
-Method: Soil w/salt, Organic soil, Hydroponics, Aquaponics, KNF
-Vessels: Type and capacity of container (fabric, plastic, etc)
-PH and TDS of Water, Solution, runoff (if Applicable)
-PPM/TDS or EC of nutrient solution if applicable
-Method used to measure PH and TDS
-Indoor or Outdoor if indoor, size of grow space
-Light system List brand and wattage/spectrum
-Actual wattage draw of lights
-Current Light Schedule
-Temps; Day, Night
-Humidity; Day, Night
-Ventilation system; Yes, No, Size
-AC, Humidifier, De-humidifier,
-Co2; Yes, No
If growing Hydro some additional questions:
-DWC? RDWC? Autopots? Ebb and Flow? Other?
-Distance of liquid below net pot (DWC)
-Temperature of reservoir
-TDS of nutrient solution
-Amount of air to solution
Always try to upload a clear picture in white light of any issues you may have to allow the community to assist you.
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Some of us have been seeing this. I believe it is pigment. Here is a link to a discussion about it. It is only on the terminal buds and wipes off.
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@Gaia69 Happy Cake day!
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Happy Versery @Gaia69 
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Thanks very much, both for the info and the happy wishes! Odd,y, my big plants—all GDP— have no such discoloration. It’s just the two little White Widows.
Happy 
day @Gaia69
I used a bug spray at evening and the next morning my new buds were black. I don’t
know what is up either, any suggestions? Could it be the type of spray?
Can’t remember strain, indica dominant. 14-15 weeks old, organic soil in plastic pot. Photo growing Outdoor and has been growing great. Just sprayed with bug spray and new buds and some leaf has turned black overnight. see my posted reply on this stream with some pics. your opinion would be greatly appreciated.
It could be a fungus that attacks the leaves parts that insects have damaged. Black sooty fungus will actually attach the to the plant with ‘root like structures’. If you catch it early you may be able to wash it off.
Sooty mold appears as a black, sooty layer on the leaves, often resulting from the honeydew excreted by sap-sucking insects like aphids, whiteflies, and scale insects
Here are a couple of examples:
- Black Spots on Leaves: Sooty mold can manifest as small, dark black patches on the fan leaves of cannabis plants. [These patches can hinder plant growth by blocking sunlight and impeding photosynthesis]
- [Grimy Appearance: The affected areas may have a grimy, sticky appearance due to the honeydew, which serves as a nutrient source for the mold]
If you’re dealing with sooty mold, it’s essential to address the underlying pest issue to prevent further mold growth. The mold can be cleaned with diluted H2O2. Once the insects are gone the fungus will too.
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