This was scale. Photo Courtesy of Reddit. Typically these are caused by a fungi that has colonized your leaves. The adansonii has it on the cutting I just planted back into the soil, while the mini monstera has it on some lower leaves. Brown spots developing on my new monstera deliciosa. They can be caused by a few different things. 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. 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. 5) Help! Mandy. Sometimes you can notice brown edges or brown spots on Swiss Cheese plant leaves. Archived. This can cause yellow or brown spotting, sometimes spreading slowly to cover much of the leaf’s surface. They’re so small they look like flat brown spots scattered under the leaves of your plant. Brown scales are stationary most of their short life. Both alternaria leaf spot and septoria leaf spot are possible variations. If left ignored, these spots start growing in size until they gradually join together and take the form of a large blotch on the Monstera’s leaf. 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. There are different varieties of scale but by far the most common is the brown soft scale (Coccus hesperidum L.). The Monstera plant, also known as the Swiss Cheese plant, is an attractive evergreen that grows large leaves with natural holes, hence the nickname. Upon closer inspection, I noticed brown nubs stuck to the woody stem and underside of leaves, closest to the central vein. 4) Help! Close. The second common pest that attacks indoor Monstera karstenianums is soft-bodied brown scales. You will want to cut off the affected stems to prevent spreading. A number of leaf spot diseases may appear on your monstera. They are […] One of the causes and the most common one is overwatering. ... 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. Brown Spots on Monstera Plants. The scale insect will appear flat and round in shape and are very small in stature. Like spider mites, brown scales feed on … My Monstera Leaves Have Black and Brown Spots. 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. Posted by 1 year ago. Mother nature would have arranged for roots to occupy a little pot-shaped root ball directly under the plant's stem. 6. 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