Although the spots often appear yellow like in the picture below, they will start turning brown over time. Leaf spots may be angular or rounded, raised or sunken, and have smooth or fringed edges. If before you water the plant every 2 days and it got into this condition add a few more days before watering. When severe many leaf spots grow together resulting in large brown patches and leaves turn yellow Stem lesions are dark, slightly sunken areas Potato tubers develop dark, sunken spots surrounded by a purplish brown raised border Rough, corky dry tissue can be seen below tuber spots when cut open Apply Epsom salts as a leaf spray every two weeks or add fertilizers rich in agnecium. Also, check that the drain hole is not plugged. Too much fertilizer. Seeing marijuana leaves turn yellow is an alarming sight. 6. I know it is frustrating when the leaves of our plants are turning yellow with brown spots, especially if we don’t know why. The spots tend to be circular with dark brown margins and tan or greyish centers. Digging organic matter helps open heavy soils, or you can install drainage pipes. As the name suggests, leaf septoria is characterized by yellow and brown spots forming on both the upper and lower sides of leaves. Known as chlorosis, yellowing happens when something interferes with your plant's chlorophyll — that's the plant pigment behind their beautiful green color. Wilted: If a healthy plant turns yellow and then wilts, it means that a fungal disease is infecting the water-carrying vessels so that the plants die of thirst. Whether you’re growing in soil, coco coir or in hydroponics, probably the most common reason to see yellowing and other nutrient deficiencies is the pH near the roots is too high or too low. If you have ruled out all the possible problems mentioned above, chances are that your plant is removing its old leaves, so that new leaves will grow. Weeping figs (ficus) and Bougainvillea have a habit of dropping leaves when they are moved and feeling stressed — usually they settle down to the new conditions. If it is fall and you have deciduous trees that begin to turn yellow, it is because they are falling, that is, as the plants prepare to overcome winter in the best possible way, the leaves are producing less and less chlorophyll. There is no cure, but it can delay the spread by removing the affected leaves. This happens a lot with zamioculca plants (eternity). Other sap-sucking pests can cause brown spots on houseplant leaves. Get rid of the gardening gloves as well. Various factors, including the shape and location of yellow spots, can help you diagnose and control the problem. Colors can range from yellow to yellow-green to orange-red to light tan, brown or black. Leaf septoria, also known as septoria leaf spot or yellow leaf spot, is a plant disease caused by a specific kind of fungus known as Septoria lycopersici. And finally, if there are yellow spots all over the plant, you probably need more zinc. Clip stems as soon as you begin to notice the yellowing of the lower leaves with brown spots. Green veins on older leaves, yellowish leaves with green veins can mean magnesium deficiency. Like too much or too little water, too much or too little fertilizer can also cause yellowing. Apply Epsom salts as a leaf spray every two weeks or add fertilizers rich in agnecium. So if you see round brown spots on your cannabis leaves it could also be caused by leaf septoria. If you let them stay on the plant, the fungus will travel from one leaf to another up the plant. Viruses can be carried by aphids and other insects, so keep pest control. So, if you see brown spots and a lot of your leaves are beginning to wilt, you might have a case of fusarium wilt on your hands. To prevent this from happening again, you should only shorten the days in between irrigation, that is, if you watered your plant every third day, now you should water it every other day. Spring weather patterns in Michigan tend to favor this pattern. Purple Shades, yellow leaves speckled with purple can signify potassium deficiency, especially if the plants are not fruiting well. It's a common issue with tomatoes, especially in wet, humid areas. If the plant leaves are turning yellow or brown. Cold Stress. Excessive lighting can also cause yellow spots on leaves, especially in shade plants. So you must make sure what is the solar need that your plant needs. WHITEFLIES. Cold air currents on tropical plants often cause the leaves to turn yellow and fall off. If you have plants indoors and this happens to you frequently, you have to verify if your plant is suited for a low light environment. Disease can be fungal, bacterial or viral in nature. 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