What You Need To Know About Yellow Spots On Weed Leaves

Growing cannabis is a rewarding and fun project. But besides caring for it properly, you must also fully understand the nuances of cannabis cultivation to ensure good growth and yield. 

If you see yellow spots on weed leaves on the upper and lower sides of leaves, you need to proceed with caution. The cannabis plant is vulnerable to many pests and diseases — one of which is leaf septoria.

Learn about it in detail in this article, including what it means, how to combat and treat it, and what happens if you don’t address the problem on time.

What Do Yellow Spots on Weed Leaves Mean?

Yellow spots on weed leaves, especially on the upper and lower sides, mean that the plant is affected by leaf septoria, a fungal disease. This devastating fungal disease attacks and weakens the foliage of many plants under warm and wet conditions. 

Should You Treat Yellow Spots on Weed Leaves?

Yes, you should treat leaf septoria or yellow spots on weed leaves early on. Taking timely steps to combat the problem will help you avoid further damage to the development, foliage, yield, and quality of your cannabis plants and ensure better growth.

How To Combat Yellow Spots On Weed Leaves

Fortunately, there are many solutions for managing yellow spots on cannabis foliage. 

Here are a few simple yet effective ways to combat yellow spots on weed leaves:

• Get rid of all the infected leaves of the cannabis plant immediately and carefully to eliminate as many spores as you can. But do this step only if the spores have affected the base of the plant and not its middle and top portions.
• Boost air circulation through the plant by pruning its leafy parts.
• Consider using fans or installing a dehumidifier near your cannabis plants to improve airflow and reduce moisture.
• Try not to get water on the weed leaves. You can lay them over each other to keep away moisture.
• Keep your plants on higher ground to expose them to the outdoor air.
• Remove dead leaves and vegetation that may be infected by spores at the base of the plant to keep it clean.
• Add mulch to the base of the plants to keep spores from spreading into the soil.
• Ensure that your cannabis plants always stay healthy to reduce susceptibility to yellow spots.
• Keep rotating crop sites or moving them to new locations annually.
• Use a copper-based fungicide or bio-fungicide to stop the spread of the fungus.
• Spray a blend of neem oil and water with a mister to combat the problem without getting the blend on the buds.
• Remove any unwanted weeds surrounding your cannabis plants even if they look small and insignificant.

What Happens If You Don’t Fix Yellow Spots On Weed Leaves?

If you don’t fix yellow spots on weed leaves early on, the fungal disease will ruin a lot of foliage. Marijuana plants need their foliage for growth and energy. 

Excessive damage to the leaves leads to their underdevelopment and poor growth, which ultimately affects harvests. This means that you will get smaller yields with reduced quality.

Timely and proper care as well as disease prevention measures will help you enjoy better harvests and yields so you reap the fruits of your labor.

If you’re a cannabis grower wanting to learn about the ins and outs of growing, you can register for our free Ultimate Marijuana Home Growing webinar.  Subscribe to our newsletter to get updates about indoor and outdoor growing tips. New subscribers receive a free Quickstart Guide to Growing Marijuana Ebook and they can join our Weed Wisdom Facebook Community.