What is killing my Hawthorn saplings ? plus garden moth species for 4th June

Something is attacking my young Hawthorn trees !
I have never seen the likes of it before, it is like a ball of white, slimy, silky web with a brown end on it.
Has anyone seen or know what this is ?

Garden Moths for 4th June
12.3 deg. C. min. temp.
A warmer, humid night would have been perfect but for the bright near full moon.
To be fair, it is rising quite late in the evening so has no effect on the early flyers.
5 more species made the garden year list out of the 32 species recorded.

0648 x 1 Endrosis sarcitrella
0649 x 1 Esperia sulphurella
0808 x 2 Platyedra subcinerea
0986 x 1 Syndemis musculana
0998 x 4 Epiphyas postvittana
1174 x 2 Epiblema cynosbatella
1261 x 1 Cydia pomonella, year first

Cydia pomonella

1342 x 2 Eudonia angustea
1428 x 4 Aphomia sociella
1474 x 1 Ephestia unicolorella, year first

Ephestia unicolorella

1707 x 1 Small Dusty Wave, year first

Small Dusty Wave

1728 x 2 Garden Carpet
1764 x 1 Common Marbled Carpet
1819 x 1 Mottled Pug
1834 x 6 Common Pug
1837 x 2 Grey Pug
1860 x 1 Green Pug
1887 x 1 Clouded Border, year first

Clouded Border

1937 x 2 Willow Beauty
2028 x 1 Pale Tussock
2069 x 1 Cinnabar
2087 x 1 Turnip Moth
2089 x 5 Heart and Dart
2092 x 3 Shuttle-shaped Dart
2102 x 1 Flame Shoulder
2126 x 3 Setaceous Hebrew Character
2223 x 1 Toadflax Brocade
2333 x 1 Large Nutmeg, year first

Large Nutmeg

2334 x 1 Rustic Shoulder-knot
2384 x 3 Vine's Rustic
2389 x 1 Pale Mottled Willow
2480 x 1 Buttoned Snout

Buttoned Snout