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My camellias sanqua have type of condition

Flowers and Ornamentals • Diseases

From photo provided, it looks like your plants are suffering from sooty mould.  
Sooty mould is caused by sap-sucking insects such as aphid, scale or mealy bugs. The insects secrete a sugary substance that goes black with mould over time, hence its name. You may notice there are ants around, as they are also after the sugary substance. Once you control the aphids or scale, the black sooty mould will disappear over time or you can wash off with soapy water. 
To treat this, we recommend 'Yates Nature's Way Citrus & Ornamental Spray (Pyrethrum Plus Oil Pest Spray)'. Controls a wide variety on insects pests on many edibles and ornamentals.  
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Yt-team

yates

Answered: 28 Oct, 2021

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