![]() This ensures that I no longer get brown spots on the leaves. This way, leaves do not stay wet for more than 30 minutes. The other fan blows fresh air into the grow tent and is placed at the bottom. I hung at the tent’s ceiling, blowing onto the plant canopy. I corrected this by adding two fans to the tent. The humidity was too high, and I had insufficient airflow. I recently had a lot of issues with brown spots in my grow tent. You can treat brown spots on tomato plants using a copper fungicide or general fungicide spray. These spots can also appear on stems and petioles. It is most common when the tomato plants are about to flower. It mainly attacks the lower leaves and spreads across the foliage. Septoria leaf spot is caused by Septoria lycopersici. They emerge in humid and warm temperatures. The fungus spreads across the wet surface of the foliage.Īccording to Minnesota University, early blight is caused by Alternaria tomatophila and Alternaria solani. These fungal issues are caused by water that remains on the leaves for too long. The main reason for brown spots on tomato leaves is Early blight and Septoria leaf spot. Eco-Friendly Dish soap (1 spoon natural castile soap)įungal brown spots were spreading in my grow tent because of too much humidity and insufficient airflow.Natural Treatments for Black Spots on Tomato LeavesĪccording to Project Diaries, you can create your own organic fungicide to treat black spots. Clean the leaves with hydrogen peroxide every couple of days. Sodium bicarbonate contains salts and is best sprayed diluted in water.Īlternatively you can also spray hydrogen peroxide according to The Rusted Garden. Ripe Tomato farms suggests using baking soda against pest and fungal infections. How to Treat Black Spots on Tomato Leaves And Fruit- Does Baking Soda Work?īaking soda works great as an antifungal against black spots on tomato plants. This information can usually be found on the back of seed packets. Wide varieties of tomatoes have been bred to be immune from certain diseases, such as blight. Purchasing disease-resistant seeds is another way to prevent your tomato plant from suffering black leaf spots. Rotate tomatoes when planting around your garden to avoid replanting into infected soil.ĭiseases can survive on plant debris and soil throughout the winter months. Many gardeners make the common mistake of planting their tomatoes too close.Įnsure that you plant your tomato plants are spaced 18-24 inches apart to prevent any disease from spreading to your crops (46-61 cm). You can buy blight resistant tomato seeds (varieties) Photosynthesis is reduced and growth stunted. Due to fewer green leaves, the tomato plant can take in less chlorophyll. In addition Spider mites suck the sap out of the leaves. They build brownish nets in between branches and on leaves. According to, they are only 1/50 inch long (0,05 cm). Spider mites are small, black to red and yellow. Brown spots caused by spider mites on Tomato leaves ![]() A Spider Mite Infestation Causing Grey and Black Spots on Solanum lycopersicum L. Jet them off with water, pluck them with your hands, or use an insecticide. Check the leaves every few weeks for any early signs. Over time, they can cause yellowing of the leaves, which will eventually lead to curling and will cause your tomato plant to become so weak that it can no longer bear any fruit.Īn aphid infestation can spread and completely take over your plant within weeks. Infestations are usually caused by a flying variety of aphids landing on your plant and laying their eggs.Īphids feed off the sap in plant leaves and excrete a “honeydew.” The honeydew then collects on the plant leaves and creates black mold spots. ![]() They usually live on the plant’s leaves, although they can spread to the stems in some extreme cases. Unlike most plant pests, they are visible to the human eye and look like small dots all over your plant’s leaves. Aphids are small bugs that are dark grey or brown.
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