Mandevilla Plants
Q.

yellow fungus growing on mandevilla

Zone Southeastern Massachusetts - Taunton | 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.

A.
A.Answers to this queston: Add Answer
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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