Fungus in your Garden: Ask the Doc

Fungus in your Garden: Ask the Doc

Welcome to another “ASK THE DOC” from HTG Supply.

Temperature and Humidity:
Fans and Ventilation:
Stump Tea:
Natural Fertilizers:
SNS 244:

Fungus is something that can effect anybody, anywhere. And in this video, Dr. Myers shows you examples of fungus infestations and will explain how to correct the problems. When you notice that your leaves are not a nice deep green, it is time to take action. One of the most common discolorations is when the lower leaves begin to yellow. This is not a real problem, and certainly is not side effect of a fungal infestation. When they yellow, it means they are being overwatered, not receiving enough light, or not receiving enough nutrients. Now when a leaf has little grey spots everywhere or browning or necrotic, this is one of the signs that tells you you have a fungal infestations. Another sign of fungus is when you have small yellow spots with browning around the edges of the spots. You can also get grey spots on your leaves when water is on your leaves. An easy way to avoid fungus growth at that point is to create a low-humidity environment.

If you have fungus in your grow room, you have several options to prevent it or slow it down. You’ve got to clean!
1) Trim all leaves that have fungus on them, as well as dead plants or soil and get them out of your grow room.
2) Then you want to spray or wipe down all grow room surfaces with a 10% bleach or 10% hydrogen peroxide solution to kill and fungal spores.
3) You’ll want to change the environment so the fungus won’t grow so well. In order to do that, you need to know the temperature and humidity if your grow room. If your humidity is over 60%, you will want to vent out your grow area and put a fan in there. The more airflow, the less likely the fungus will be able to grow.

You can also introduce beneficial microorganisms, like Stump Tea. By introducing these bacteria, in Stump Tea’s case, the beneficial fungus Mycorrhizae. They will compete with the bad fungus and prevent it the bad fungus from growing.

Next you will want to improve your plants’ immune system so the plant can fight the fungus itself. An easy way to do that is to supply potassium to your plant, as it is proven to raise your plant’s immunity. So if your fertilizer does not have a lot of Potassium, add one in that does (potassium is your third number on your fertilizer’s N-P-K.

Another alternative is to introduce silicon. A proven silicon supplement would be OSA-28. A small bottle is expensive but you only use a very small amount, so the bottle will actually go a long way.

Lastly, you have the option to use a fungicide. This will actually kill the fungus. Dr Myers recommends using SNS-244 (Thyme Oil). Just spray your plants when they’re not under bright light and spray the tops and bottom of your leaves. As a last resort, you could use Eagle 20EW. You will introduce this fancied while watering your plant(s), and your plant(s) will absorb the fancied that way. Every cell in the plant will then contain this fungicide. It is recommended on the bottle not to use this within a month of eating your plant. And some recommend not to use it at all on edible plants. So plants like orchids and flowers, Eagle 20EW is a good go-to from the start.

If you’re experiencing issues in your seedlings, it is recommended to start your seedlings out in a sterile starter plug or vermiculite.

1. Increase airflow.
2. Decrease humidity.
3. Introduce beneficial microorganisms.
4. Use a fungicide if you need to.
5. Start your seeds in a soils mix if you’re having issues.

Good Growing!


HTG Supply


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Written by Aleksandar

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