456 SECTIONAL TRANSACTIONS.—K#*. 
DEPARTMENT OF FORESTRY (K*). 
Thursday, September 5. 
Mr. W. R. SmitH (Chairman).—Economic aspects of forestry (10.0). 
Mr. A. L. Howarp.—Our British-grown hardwood trees (11.0). 
Mr. J. M. B. Brown.—The pine shoot moth (Ryacionia buoliana Schiff) 
and its control in East Anglia (12.0). 
The Pine-Shoot moth is a familiar pest of pine in Europe and the Near 
East, and has recently invaded the North American Continent. The life- 
cycle is annual, the eggs being laid in July and August on the shoots of the 
current year, the young caterpillars crawling up to the buds, entering these 
and commencing feeding. Enclosed in the buds and covered by a pro- 
tective web, they pass the winter, and in the early spring, once flushing 
begins, they leave the winter buds and migrate to others, often those on 
other branch whorls. Their general direction of movement is upwards. 
Intensive feeding proceeds from early spring until mid-June, when the 
full-grown caterpillars, now plump, reddish-brown in colour with black 
heads, form brown pupz, from which the mottled reddish-brown moths 
emerge in two to three weeks. Damage consists in the killing or deforma- 
tion of buds and shoots. If the leading bud is attacked, the form of the tree 
is affected. If the leader is destroyed, its place may be taken by the strongest 
lateral shoot, and recovery is good or ill according to the distance of this 
new leader from the stem axis. Sometimes, the leader may be injured 
but not destroyed. It may then fall over and re-establish itself as the 
familiar ‘ Posthorn’ shoot. Artificial measures of control have been tested 
out in East Anglia on the Forestry Commission’s plantations, the results of 
which are discussed in this paper. 
AFTERNOON. 
Excursion to Lakenham Hall, Hethel Church, Hengham Hall (2.0). 
Friday, September 6. 
JOINT SEssION with Section K (Botany), g.v., p. 445. 
Saturday, September 7. 
Joint Excursion with Section K (Botany) to Breckland (10.0). 
Sunday, September 8. 
Excursion to Holkham and Weasenham (10.0). 
