Q.Leaves On Honeysuckle Turning Yellow The Falling Off
Every year my honeysuckle, which grows over an arch, starts growing in the spring and by summer has plenty of lush foliage but then the leaves underneath start turning yellow then dropping off and by the time flowers appear in late summer there are very few leaves left

Certified GKH Gardening Expert
This is one of many Honeysuckle Leaf Blights! Fungicides can help take care of the issue, along with proper feeding and care:
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm
https://www.gardeningknowhow.com/ornamental/vines/honeysuckle