Mandevilla Plants

Yellow Fungus Growing on Mandevilla


Anonymous added on October 19, 2016 | Answered

What is the yellow fungus growing on the vines of my mandevilla plant? I moved the plant indoors. It is in a pot (8"x 8"). The fungus consists of small yellow spots, slightly raised that are easily rinsed off (I know this because I rinsed the plant off when I brought it in the house). It is on a table in the front bow window that gets direct sunlight until noon. It has always been potted and when I originally rinsed it, the fungus was on only a few vines but now covers them all. At night the house temp never goes below 60 and goes up to 75 during the day. We have a wood pellet stove we heat with and the electric heat is always set at 60 for nighttime. The table with the plant sits in front of the electric baseboard heater.


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ANSWERS
Downtoearthdigs
Certified GKH Gardening Expert
Answered on October 20, 2016

It sounds like your plant has a Rust Fungus. This can be due to damp growing conditions and poor air circulation.
https://www.gardeningknowhow.com/plant-problems/disease/learn-about-plant-rust-disease-and-rust-treatment.htm
Neem Oil can be used to treat this fungus.
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

Your Mandevilla plant can be overwintered with some care.
Here is a link that will help you.
https://www.gardeningknowhow.com/ornamental/vines/mandevilla/winterizing-mandevillas.htm

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