Z| 
Insect Injuries—The unusually dry weather of May * was fa- 
vorable to the growth and development of the tent caterpillar, 
maple worm, and inch worms of various kinds. These are all 
chewing, leaf-eating larvae. Spraying with lead arsenate did not 
seem to be particularly effective: in most cases we had to resort to 
more drastic methods. The chestnut louse, Calaphis castaneae, 
was noticed on July 16, and was finally entirely subdued by three 
sprayings with nicotine sulfate, the last dose being applied Aug. 
Dire Resistance of Chestnut Growimg at High Altitudes.— 
In several cases ey to us, trees growing at higher altitudes 
(e.g. 1,500-5,000 ft.) are apparently free from disease. Whether 
this is due to disease resistance, or to isolation, or to some other 
cause or combination of causes, we are not yet prepared to state. 
It is possible it may have some connection with the known fact 
that the fungus grows more slowly in localities with a compara- 
tively low mean temperature.f This whole question needs further 
careful experimental study. 
In this connection it may be of interest to quote from a letter 
received last July from R. C. Ching, of the Lu-Shan Arboretum 
and Botanical Garden at Han-Po-Kou, Lu-Shan, Kiukiang, China. 
“T took great pleasure in reading twice the Annual Report of 
d 
jen 
your Garden of which Dr. Graves’ report on Chestnut Breeding 
strikes me considerably in view of the fact that some of the 
Chestnuts he worked with are from China. Castanea Seguini 
and C. Henryi are two of the Chinese species of the genus which 
are, according to the report, not hardy at your region. The seed 
of the two Chinese chestnuts were, | am of the opinion, collected 
from trees growing at lowland in [fast China. Here right in our 
garden, which lies at 4,000 ft. altitude, are growing spontaneously 
in great abundance these two chestnuts which have from time 
* The total precipitation for New Haven, Conn., for May, 1935, was 1.7 
inches, which is nearly 2 inches (1.99) less than the normal for this month. 
Only twice in the last thirty years have we had a drier month of May; 
namely, in 1926 and 1905. See monthly meteorological summary for May, 
1935. U. S. Dept. of Agric., Weather Bureau, at New Haven, Conn. 
7 Stevens, N. E. The influence of certain climatic factors on the develop- 
ment of Endothia parasitica (Murr.) And. Amer. Jour. Bot. 4: 1-32. 1917 
——— The influence of Courses on the growth of Endothia para- 
sitica, Amer. Jour, Bot. 4; 112-118. 1917. 
fate 
