unt of winter injury of catkins during the winter
1932-33, I am making four groups. First, those varieties in which all,
or practically all the catkins were killed. In the varieties suffering
such severe catkin injuries, much of the wood was killed, but this will
be treated separately.

The varieties in this group are Nottingham, Early Prolific, Garibaldi,
Kentish filbert, Pearson's Prolific, Princess Royal, the Shah, Webb's
Prize Cobb, Bandnuss, Barr's Zellernuss, Berger's Zellernuss, Grosse
Kugelnuss, Heynicks Zellernuss, Lange von Downton, Multiflora, Sickler's
Zellernuss, and a Corylus rostrata brought into cultivation from a glen
a few miles away. The planting of varieties in this list is not
recommended.

The second group includes those sorts in which 50 to 90 per cent of the
catkins were killed. The varieties are Barcelona, Daviana, Fertile de
Coutard, Montebello, Cannon Ball, Duke of Edinburgh, Duchess of
Edinboro, Prolific Closehead, Red Skinned, Kadetten Zellernuss, Kaiserin
Eugenie, Kunzemuller's Zellernuss, Liegel's Zellernuss, Prolifique a
coque serree, Romische Nuss, Schlesierin, Truchsess Zellernuss, Voile
Zellernuss, Kruse, and Littlepage, a variety of Corylus americana from
Indiana. Some wood killing occurred among the varieties in this group.
None of these varieties should be depended upon for pollination
purposes.

The third group includes those varieties experiencing 20 to 50 per cent
winter injury. The varieties are Kentish Cob, Italian Red, Bollwiller,
Red Aveline, White Aveline, and Vollkugel. These varieties may be
planted with caution if too much dependence is not placed upon them as
pollinators.

In the fourth group are those with less than 20 per cent of catkin
injury. These are Clackamas, Cosford, Minna, Early Globe, English
Cluster, Medium Long, Oregon, Purple Aveline, Red Lambert, White
Lambert, D'Alger, Althaldensleber, Ludolph's Zellernuss, Luisen's
Zellernuss, Neue Riesennuss, Eickige Barcelonaer, and Winkler and Rush,
the latter two being varieties of Corylus americana. Varieties from this
group and the third group should be used as pollinators and as parents
in breeding work to develop catkin hardy varieties.

Winter killing of the wood has not been as extensive nor as serious as
catkin killing. It is usually slight and confined to a few varieties but
during the past winter 1932-33, many varieties killed back severely.

The varieties are grouped according to the amount of winter