However, laboratory tests have shown the bacteria are resistant to copper, and application of these chemicals causes phytotoxicity. Some sources recommend using copper fungicides to control leaf blight. This helps prevent the bacteria from spreading further. It’s best to remove the leaves by breaking the petiole near the leaf blade. The best way to control leaf blight in plants with foliar infection is to remove and burn any infected leaves. Plants with foliar infection may still be saved, as the bacteria hasn’t yet made its way into the vascular system. When only the leaves are infected, this is known as foliar infection. A systemically infected anthurium cannot be saved. If the entire plant is infected by leaf blight (known as systemic infection), you’ll have to destroy it to avoid spreading the disease to other plants. Simply touching an infected plant and then touching a healthy plant will spread the bacteria and infect the healthy plant. The bacteria known as Xanthomonas can infect most aroid species.Ĭontact with other infected plants or tools after pruning and harvesting will also spread the highly contagious disease. It’s an inexpensive way of using the drip irrigation technique in your house plants.Īnthurium plants grown close to other aroid species – such as dieffenbachia, spahtiphyllum, or aglaonema – may become infected with blight. Watering your anthurium plants by placing six ice cubes on the soil and allowing them to melt once per week keeps the leaves from getting wet. It’s important to keep the leaves dry in plants susceptible to bacterial diseases – like anthurium. Getting foliage wet during watering is a major contributor to leaf blight. In addition, bacteria spread easily across wet surfaces. Even harvesting flowers or taking cuttings can cause wounds that allow bacteria to enter. Bacteria may also enter the leaves if they become damaged during pruning or are punctured in any other way. The bacteria that cause leaf blight infect the plant by entering through the pores along the leaf edges. Flowers may become faded in color, and without treatment, the plant wilts and dies. Leaves develop yellow then brown spots and may take on a bronze appearance. Once bacteria infect your anthurium leaves, they spread quickly throughout the entire plant. In some cases, it may take months for plants to show symptoms as the bacteria multiply on the leaves. The amino acids found in the liquid provide food for the invading bacteria, which can then infect other nearby plants. Guttation droplets typically form during the night when temperatures are warm, humidity around the plant is high, and the potting soil is wet. These are known as guttation droplets, and they look like tiny drops of water forming on the leaf margins. Small sap droplets will also be present on the leaves where the bacteria enter. These lesions darken with age and eventually cause deformed leaves. Faded and spotted flowers (systemic infection)īefore brown spots form, you’ll notice yellow lesions along the leaf edges that rapidly turn into necrotic, v-shaped lesions.Guttation droplets forming on the leaf margins.Yellow lesions darkening into necrotic brown spots.Symptoms of Bacterial Leaf Blightīacterial leaf blight in anthurium plants cause: It may not be too late to save your plant – especially if the brown spots are minimal and haven’t spread beyond the leaves. Here’s how to fix these problems and restore your anthurium to health.īoth bacterial diseases and nutrient deficiencies can be treated if you catch them early enough. However, nutrient deficiency or too much sunlight may also cause brown spots. So, why do your anthurium leaves have brown spots? The most common reason is leaf blight (also known as leaf spot), caused by bacteria that infects the leaves. Not wanting to lose our plant, we learned what was wrong and what to do about it. After years of growing anthurium, we finally experienced this issue too. While diseases are not common, occasionally the plant’s leaves can develop brown spots. This Anthurium leaf has brown spots due to bacterial leaf blight.Īnthurium (also known as flamingo flower) is a popular and relatively easy-to-grow tropical houseplant. If you click through and make a purchase, I will earn a commission at no additional cost to you. Disclaimer: Some of the links below may be affiliate links.
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