42 
in spite of this the ascospores are apparently of little importance 
in the life-history of the fungus, as it reproduces itself by means 
of hibernating mycelium. The disease, therefore, must be 
controlled by pruning, and not by spraying, though experiments 
conducted at Wisbech and elsewhere showed that the conidial 
stage of the fungus could be very materially checked by the 
use of a strong lime-sulphur wash. A paper on the subject will 
shortly be published. 
Botrytis.—A comparative investigation of the morphology 
and parasitism of the fungus Botrytis cinerea has been carried 
out by Mr. Brierley, particularly in Aesculus Pavia and Ribes 
alpinum. An account of the behaviour of the fungus in the 
former will be found in Kew Bull., 1917, p- 315. In Ribes 
alpinum the fungus was found to be confined to the dead, water- 
conducting elements of the stem, and is present throughout the 
aerial portion of the plant; developing along with the host and 
existing in a symbiotic condition with its tissues. The host is 
stunted and stimulated to the formation of galls which morpho- 
logically are adventitious roots. 
The results of an investigation of the morphological characters 
of Botrytis cinerea and their specific value will be published in 
the Bulletin in the course of the year . 
Progress has also been made during the year in the investiga- 
tion of Thielavia basicola and Trichophyton crateriforme. 
few =. Sues of the commonly grown market varieties of fruit, 
e ITI.—Traveziine. 
Official visits were paid to the Wisbech district in connection 
with the spraying of apples for Apple Mildew and other diseases, 
and to Evesham and Worcester with reference to parsnip canker, 
Silver Leaf in plums, and obscure diseases of the potato. The 
spread of Weymouth Pine Rust was examined at Oxford, and 
visits were paid to Ormskirk and other localities in connection 
with Wart Disease and other maladies of the potato. , 
Presentations to the Library during 1917.—Prof. ©. S. 
‘Sergent, Director of the Arnold Arboretum, has continued to 
send to Kew the official publications of the Arboretum, and these 
