Yellow leaf spot, also known as leaf septoria, are caused by Septoria cannabis and S. neocannabina. These are fungal pathogens aimed specifically at marijuana plants.
It is brought about by warm weather and rain and effect marijuana grown outdoors. It may also show up in nitrogen- deficient plants. Read this article and learn how to identify and treat yellow leaf spot.
Signs of leaf septoria
Yellow leaf spot initially shows up on the lower leaves of your plant. These spots may vary in shade from white to a grayish brown to yellow, initially displaying little circular lesions. Once it starts to grow it starts looking like a bump and its size continues to increase.
Yellow leaf spot will harm the leaves and often times the stems of the plant, although it won’t cause the crop to die off. If for any reason this is not properly cared for it will lessen the marijuana plant’s yield. The affected leaves will become dry where the spot is and overtime break and produce a hole at the point where the spot started off.
How to avoid and cure leaf septoria
The most affected leaves will become totally yellow, dry out and fall off. You will want to get rid of the leaves that fell off or else you will end up with a landing turf for spores to overwinter. Basically, they will hide out until the weather warms up and then that’s when they will wreak havoc. Yellow leaf spot spores do their dirty work through traveling by water, wind and clinging on to things that pass by.
You can avoid the damage yellow leaf spot causes your plants through crop rotation. Basically, after every harvest you will pick a new location to plant. If you are not able to do this, then after harvest, completely get rid of all leftovers from the last vegetation and till the soil really good to make sure all remains are gone.
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Get the location ready using sterilized compost and mix it well into the soil. Doing this will give the new crop plenty of nitrogen to provide a good, strong start. If you don’t have any ready compost, you can mix in blood meal, fish meal or soybean meal to the dirt that is already there.
Therefore, you will be certain to have all the necessary nitrogen for your plant. Make sure you proper disinfect any tools you used with rubbing alcohol or peroxide prior to putting them away.
One more thing you can try when beginning a new marijuana bed is adding a fungicide to the planting location prior to putting the seedlings and seeds there. You have the option to buy one of the many natural solutions pre-made (at this link here) or you can make your own.
“Cleanliness is the secret to disease and pest prevention.”Jorge Cervantes
Applying helpful bacteria, like Bacillus Pumilis or
Marijuana plant symptoms
- white/grayish brown/yellow spots on leaves
- Circular lesions on lower leaves
- A small pimple looking bump
- Leaves dry and fall off
Remember to water your plants early mornings or early evening time. Never water the leaves, only the soil. By doing this, the sunlight will not burn the leaves. Again, if your plants gets infected by yellow leaf spot, it is important to always remove and completely destroy all affected leaves.
If you don’t do this, you will most likely regret it. Affected leaves still contain the problem and can come back to haunt you because yellow leaf spot easily clings on to things and travels from one destination to the next.
Plants with strong genetics are less vulnerable to pests and diseases. Buy high-quality cannabis seeds from our seed bank.
Have you ever grown marijuana plants that developed leaf septoria? Do you have other tips on treating or preventing it? Please share your experience with us in the comments!
FAQ About Leaf Septoria
You can avoid the damage yellow leaf spot causes your plants through crop rotation.
Septoria leaf spot is caused by a fungus, Septoria lycopersici.
Septoria Leaf Spot is a fungus and spreads by spores. As with other fungal disease, it establishes and spreads most rapidly in wet or humid weather