My Ficus Elastica Is Having Some Dried Up Spot On The Underside Of Its Leaves, And I’m Not Sure What It Is?

Question

I water it once weekly when the soil is dry and place it beside a north facing window… it receives bright indirect light from 2/3pm till sunset.

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Answer 1

Unfortunately, this looks to be algal leaf spot. Watering on schedule will not be appropriate. These will prefer to remain on the dry side, and down to a depth of about halfway the container.

A moisture meter may be needed to keep track of watering.

Fungicide treatment will be necessary, as well.

Here are some articles that will help:

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

https://www.gardeningknowhow.com/plant-problems/disease/algal-leaf-spot-control.htm

https://www.gardeningknowhow.com/houseplants/rubber-tree/how-to-care-for-a-rubber-tree-plant.htm