Bud rot?need answers

Trying to get some answers to what I should be doing next. Should I cut the bud off or the whole branch.

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Looks like it. Can you get a closer, and clearer picture?

Give that leaf a tug. If its brittle and comes clean out… bad news.

A clearer closer pic is recommended but from that POV? Looks like it might be

Definitely appears to be. I’d remove it and bag it. Get your humidity down and/or more movement. Grey mold is highly active and practically omnipresent. Once it begins to colonize it will spred fast. Pulling a lead out in the middle of it would burst millions of spores into the air. So I wouldn’t do that inside the tent, since you are already in the fight.

Found on a wide range of plants (too many to mention), gray mold ( Botrytis cinerea ) is a fungal disease that travels quickly through gardens, especially during damp, cool to mild weather. Disease symptoms appear as grayish colored soft, mushy spots on leaves, stems, flowers and on produce. Spots may become covered with a coating of gray fungus spores, especially if humidity is high. Fruit or plants shrivel and rot and often develop black, stone-like sclerotia — a compact mass of hardened fungal filaments — under rotted parts.

Gray mold is often found near the soil surface or in the densest areas of the plant canopy. It develops on wilted flowers first, then spreads quickly to other parts of the plant. The disease may also occur in storage areas causing rotting of harvested fruits and vegetables.

Botrytis blight overwinters on plants, in or on the soil, and as sclerotia. Spores develop when conditions are optimal, and are moved by wind or splashing water onto blossoms or young leaves, where they germinate and enter the plant. Spores require cool temperatures (45-60 F.) and high humidity (93% and above) to germinate. Germinating spores rarely penetrate green, healthy tissue directly, but can enter through wounds on growing plants. Cuttings are particularly susceptible to infection.


  1. Prune or stake plants to improve air circulation between plants. Make sure to disinfect your pruning equipment (one part bleach to 4 parts water) after each cut.
  2. If growing indoors use a small clip-on fan to improve air flow.
  3. Keep the soil under plants clean and rake up any fallen debris.
  4. Add a good amount of organic compost or mulch under plants. Mulches will prevent the fungal spores from splashing back up onto flowers and leaves.
  5. Water in the early morning hours, or use a soaker hose, to give plants time to dry out during the day.
  6. Do not compost infected plant leaves or stems, and thoroughly clean up garden areas in the fall to reduce over wintering sites for the fungal spores.
  7. Copper-Soap fungicides will help by protecting plants from disease spores. Apply at the start of flowering and continue every 7-10 days until harvest. Fungicidal sprays are especially warranted when weather forecasts predict a long period of cool, wet weather.
  8. Safely treat most fungal diseases, including Botrytis blight, with SERENADE Garden. This broad spectrum bio-fungicide uses a patented strain of Bacillus subtilis that is registered for organic use. Best of all, SERENADE is completely non-toxic to honey bees and beneficial insects.
  9. Mycostop, a biological fungicide approved for organic use, has shown suppression of the disease. Direct spray (5 gm/ 50 liters of water) to susceptible leaves, flowers and fruits to point of run-off. Apply every 2-3 weeks, or as needed depending on disease pressure.
  10. [Green Cure Fungicide] contains a patented formula of potassium bicarbonate — commonly used in food products — that kills many plant diseases on contact and provides up to 2 weeks of residual protection. At first sign of disease, mix 1-2 Tbsp/ gallon of water and apply to all exposed surfaces of the plant. For best protection, repeat at 1-2 week intervals until conditions are no longer favorable for disease development.

I just stole this from another site. Felt lazy. Number 10 there is basically the same as RB’s mold control.


Damn good point man!


It’s this one better

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Spray the rot with hydrogen peroxide and then cut off the bud. You don’t have to remove the whole branch unless the rot is being caused by an infection throughout the branch


Yes. Good catch @MattyBear . It would be wise to neutralize the colony before disturbing it. Which is just a technical way of saying douse it in h202 (hydrogen peroxide)


Thank to all for the knowledge.


Look downstream on that branch and others on that plant. If you see greyish dead looking stalk cut it below that asap.

It often gets inside the plant and slowly kills the stems. Being below the canopy it’s often hard to spot until a bud starts looking wilted.

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Hopefully not. But more often than not it enters on the stems directly. Since pruning cuts are the usual entrance. Would definitely be checking the stems like @GulfCoastGurilla said. That’s exactly how it entered when I got it on my first grow. My reaction was a thorough douse in heavy h202 then chopped a couple weeks early… then washed and slow dried. With any bud with any minutiae sign of rot being destroyed… I probably over reacted. But I had 7 plants in one tent. It only effected two. By getting them addressed and away from the rest I prevented potential loss of 7 plants instead of just ~40% of two.

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Thanks to everyone for all the information