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Seeking advice on a diagnosis and treatment plan for diseased Mandevilla plants

The mandevilla plants are growing in large terra cota pots in well drained soil (potting mix) at Bundaberg on the eastern side of the house in semi/full sun, are well mulched (bark chip) and fertilised (osmocote slow release). They do well through winter and spring but then post Xmas seem to loose vigour and get diseased. Anthracnose?

Flowers and Ornamentals • Pests

From the photo provided, it looks like the mandevilla has a heavy infestation of scale.  It looks like it might be under stress from excess water.
We recommend removing any of the yellow or brown, dead leaves from the plant and put them in the bin.  This will stimulate new growth and assist the plant in its recovery.  Ensure the excess water is able to drain freely from the pot.  If there is a tray beneath the pot, please remove.
Get in the habit of removing any dead/yellow leaves and flowers.  This will help keep the mandevilla looking its best and reduce the risk of disease.
To treat the scale, try 'Yates Nature's Way Citrus & Ornamental Spray (Pyrethrum Plus Oil Pest Spray)'. Controls a wide variety on insects pests on many edibles and ornamentals.  
Click here for more info on this product:
To assist with lots of healthy new growth and flower production, try 'Yates Thrive Roses & Flowers Natural Fish & Seaweed+ Concentrate' as a complete fertiliser to assist with healthy growth and prolific, beautiful flowers. Click here for more info on this product: 
The Thrive Naturals for Roses & Flowers Concentrate can be applied weekly.  Wait for the plant to dry out first.  Mandevillas do not like wet feet.



Answered: 11 Mar, 2022

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