Garden Pests and Diseases: Rhododendron disease?, 1 by TikkiRo

TikkiRo wrote:
Hi guys
I've had this wee plant for a year or so & it had previously done well although I don't remember it flowering this year. It's planted in proper ericacecous compost and fed every month with a rhododendron/azalea feed.

I'm concerned that this problem is spreading rather rapidly as it would appear much of the plant is now affected by whatever the problem is & as such I'm assuming it's from the roots upwards rather than an external pest?

Any ideas of what may be going on with it?

Thanks
TKR