Posted: 05/06/2014 at 13:06
Hi Emily - it has honeysuckle powdery mildew. It attacks honeysuckles which are struggling a bit, usually because it's got too dry and warm at the roots. They need moist and cool roots.
Give it a feed with Fish Blood & Bone (as directed on the pack) and give it a good watering. Then mulch with garden compost or well-rotted manure (don't let the manure touch the stems). If the area around the honeysuckle roots gets direct sun at any time find a way to shade it.
All that will give the honeysuckle the strength to outgrow the condition.
My new honeysuckle has done exactly the same and lost all its leaves due to mildew because the garden centre had allowed the pot to dry out (that's how I got it cheap). However, I've treated it as above, and it is now putting on healthy new growth.