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Need help with Mandevilla problem

Posted by rjinga middle ga, zone 8 (My Page) on
Tue, Aug 28, 07 at 21:00

posted this on the tropical forum, no one ever seems to respond over there....maybe you guys will be willing to help me.

I have 3 plants all planted in pots at the same time, on the same watering regime, more or less the same amount of sun etc.

2 are doing great, the other (photo attached) just suddenly went downhill....

If anyone has any suggestions to problem solve this?

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Follow-Up Postings:

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RE: Need help with Mandevilla problem

Its leaves seem to be infested with some kind of pest.

Check to see if any can be seen, or take some leaves to a nursery for requesting their opinion and suggestion on what treatment to use.

Also slip the rootball out of the pot and check the condition of the roots. If you see any dark brown roots, that could indicate the plant is being over watered. or the that the soil in the pot does not drain well enough.

Healthy roots that are not dirty from from soil, are usually white.

Rotting roots are medium to dark brown no matter how well you clean the soil away.


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RE: Need help with Mandevilla problem

Looks like root rot to me too. Most Mandevillas don't like overwatering. I keep mine in small pots or clay pots. making sure that the soil dries out a bit in between watering. They are prone to pests like mealy bugs, white flies and mites besides some deseases like black spot on the leaves and root rot. It would help a lot too if you can have a spraying schedule of fungicide and insecticide/miticide.

Although all three plants received the same care, plants just like humans are still different from each other. Some are weak, some are strong. Hope this helps!


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RE: Need help with Mandevilla problem

  • Posted by rjinga middle ga, zone 8 (My Page) on
    Fri, Aug 31, 07 at 13:09

I was actually afraid this plant was dying from UNDER watering....because I have not deep watered for a few weeks! and they have gotten a scattering of rain over that time.

I'll take a look at the roots and see what I see....thanks for the tips.


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RE: Need help with Mandevilla problem

Hi Rjinga! How are your mandevillas doing? Did you get to check the roots? I hope you found what's caused that problem. If it was underwatering, the young leaves would first wilt and not turn that color as in your pic. I water well with fertilized water (1/2 dose) then let it dry. As I said, I keep mine in small pots, 6" plastic or clay pots that way, they do not stay wet too long. here's a pic of my Mandevillas with my little garden helpers.

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RE: Need help with Mandevilla problem

Hi, living in Tenerife, Spain where the temp is allways high I have been growing Madevilla for the past year with no problems. Now one looks unhealthy, the leafs are green but the flower buds don't flower fully. Any idea if it could be over watering ? Another has its leafs turning brown. I am thinking of repotting both of these to see if it helps. What do you think ?


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