Milky coating on Hebe bush?


My Hebe bush has developed this milky coating on its leaves this summer. I wasn't sure what it was. But as it wiped off, I let it be. Now it seems to be spreading to the new growth, and it's sheading allot more leaves than normal.
Is this something like box blight? Not sure what to do with it. Any help or advice would be appreciated, thanks.
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I will give it a good feed and cut it hard back.