They can be caused by a few different things. 5) Help! Both alternaria leaf spot and septoria leaf spot are possible variations. This can cause yellow or brown spotting, sometimes spreading slowly to cover much of the leaf’s surface. The Monstera plant, also known as the Swiss Cheese plant, is an attractive evergreen that grows large leaves with natural holes, hence the nickname. Like spider mites, brown scales feed on … Black or Brown spots can be a sign of too much direct sunlight that burns a monstera’s leaves. Photo Courtesy of Reddit. Brown Spots on Monstera Plants. One of the causes and the most common one is overwatering. Brown spots developing on my new monstera deliciosa. Mother nature would have arranged for roots to occupy a little pot-shaped root ball directly under the plant's stem. ... As many issue come from the soil (whether the symptoms are on roots, stems or leaves), first make sure you have a well drained soil. 6. 4) Help! The best home for your Monstera is a place with bright, indirect sunlight. Upon closer inspection, I noticed brown nubs stuck to the woody stem and underside of leaves, closest to the central vein. I think that your brown spots are due to the leaves that are turning brown are ones that are just weaker due to too much white pigmentation on that particular leaf. There are different varieties of scale but by far the most common is the brown soft scale (Coccus hesperidum L.). Signs that your plant is affected by scale insects is leaf drop or yellowing leaves and white and yellowish spots on the leaves, stems or branches. Brown spots developing on my new monstera deliciosa. Growing a Monstera plant does not require special treatment, but this plant does have problems with the plant leaves turning yellow or brown, as well as developing brown spots. Posted by 1 year ago. Brown scales are stationary most of their short life. My Monstera Leaves Have Black and Brown Spots. This was scale. They’re so small they look like flat brown spots scattered under the leaves of your plant. They are […] My Monstera Adasonii and Mini Monstera (I know the latter isn’t a monstera and rather a raphidaphora but still) both have brown spots with a yellow ring around them. The adansonii has it on the cutting I just planted back into the soil, while the mini monstera has it on some lower leaves. Scale insects will mainly attack your monstera’s stem and leaf joints over its foliage. Archived. A number of leaf spot diseases may appear on your monstera. A brown spot on the leaf of your Monstera could be a sign of fungal or bacterial infection. The second common pest that attacks indoor Monstera karstenianums is soft-bodied brown scales. Fungal infections usually begin as a single brown spot, which then increase in number over time. Typically these are caused by a fungi that has colonized your leaves. The scale insect will appear flat and round in shape and are very small in stature. Close. 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