Help needed in identifying the problem

gve

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I have a small azalea which is coming down with something. I am not sure what this is and what causes it. Some of the new shoots are much lighter in colour than the older ones. Some of the leaves are getting brown around the edges and worsens as time goes on. I did feed once so far this season with a liquid fertiliser 7:5:6 (NPK). This was about 2 weeks ago.

I did read somewhere that it can be a lack of some mineral or something. I did take good care to stick to the dosage suggested on the bottle.

Pic 2 and 3 is a close-up of the brown leaves. Pic 4 shows the light coloured leaves.

Thanks for your advice!!

Gerhard
 

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gve

Sapling
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Switzerland
I'll definitely check it out Sand, Thanks!
I keep it indoors, Rick, because it is not quite warm enough yet outside.
 
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