The unusually high temperatures and heavy rainfall caused growth to continue much later than normally and thus prevented the wood from ripening properly before winter set in.

English walnuts are found at several places throughout the lower peninsula and more particularly in the southern half of the state. In no place, however, are the trees numerous with the exception of a small area around Lexington, where there are approximately 100 trees. Inasmuch as this paper deals with the effect of low temperatures on the English walnut, the minimum temperatures of the weather station nearest to the places mentioned in the following text are given hereunder.

Lowest
PlaceMo.-DateTemp.
AlleganFeb. 9-19
Bay CityFeb. 9-20
CaroFeb. 9-30
CroswellFeb. 9-26
FennvilleFeb. 9-20
FlintFeb. 9-15
Grand RapidsFeb. 9-16
Gull Lake—Kellogg FarmFeb. 9-18
HartFeb. 9-22
LansingFeb. 9-18
Mount PleasantFeb. 9-21
MuskegonFeb. 9-16
OwossoFeb. 9-20
SaranacFeb. 20-25
SpartaFeb. 9[A]-22
Leamington, Ont.Feb. 9-18
GuelphFeb. 9-30
SimcoeFeb. 9-30

[A] Unofficial.

The extreme cold of the past winter following a warm, wet autumn caused a great deal of injury to English walnut trees in this state and elsewhere. The data presented herein were obtained by a careful examination of several plantations or individual trees scattered over the southern half of the lower peninsula in Michigan and in southwestern Ontario. To properly present this information it seems desirable to group the varieties or strains according to their place of origin.

Group 1. Cultivated Varieties from the Pacific Coast.

In this group we have Mayette, Franquette and Seeando. The Mayette has been considered one of the hardiest of the cultivated varieties and was therefore included in the plantings at the Kellogg Farm. More than twenty trees were planted and every one died last winter or in the preceding winter. Seeando, a new and supposedly hardy variety from Washington state, was planted in limited numbers in the spring of 1933, but every tree perished last winter. Franquette was not planted as a nursery tree, but was top-grafted on several large black walnuts at the Kellogg Farm and at East Lansing, Michigan. The grafts made a vigorous growth but only two out of eleven lived through the winter. In Simcoe, Ontario, where the minimum temperature was -30F, a six-year-old tree was so badly injured that it will likely die this winter, but should it not perish, the degree of injury is so severe that it will be of very little value. In the Niagara district the Franquette top-grafted in 1926 on black walnut came through in moderately good condition, but in this part of Ontario the minimum temperature was only 10 below zero F.

Group 2. New Varieties of Canadian Origin.

This group contains Broadview and McDermid. Broadview scions were secured from Mr. J. J. Gellatly of Westbank, B. C., who discovered the variety near Broadview, B. C. These scions were grafted on a medium-sized black walnut in 1931 and have since made a remarkable growth, but notwithstanding the vigorous growth there was no killing back during the past winter or in preceding winters. This variety was also grown as a top-graft by Mr. Carl Walker of Cleveland Heights, Ohio, where the minimum temperature last winter was -26 degrees F. Some killing back was reported on this tree, but the injury was not severe enough to be serious. The Broadview is reported to have endured without injury -25 degrees F. in British Columbia and in Russia, where the parent tree originated, equally low temperatures are said to prevail. The McDermid was obtained from Mr. Peter McDermid of St. Catherines, Ontario. This tree is a third generation tree in Ontario and is descended from a tree brought out from Germany more than 100 years ago. The nuts are large with a moderately thick shell and contain a kernel of excellent quality. McDermid has been grown as a top graft at Simcoe, Ontario, East Lansing, the Kellogg Farm and Estate near Augusta and at South Haven, Michigan. All of the trees of this Variety grown in Michigan came through without injury, but the tree at Simcoe, Ontario, suffered somewhat by killing back of the past season's growth. The larger branches and trunk, however, were uninjured and have since made a rank growth. The McDermid top-grafted on a black walnut on Mr. G. Tolles' farm at South Haven proved hardy and was one of the few English walnut trees in Michigan to bear nuts this year.

At the Michigan State College where the temperature went to -18 degrees F. vigorous McDermid grafts on a thrifty black walnut were uninjured whereas all the Franquette grafts on the same tree were killed outright. Similar results were noted on several trees at the Kellogg Farm near Augusta, Michigan.