Standards and Color Nomenclature,” Washington, 1912. 
315 
XXXIV.—ON A TREE OF AESCULUS PAVIA 
KILLED BY BOTRYTIS CINEREA. 
STUDIES FROM THE PATHOLOGICAL LABORATORY: V. 
Wim B. Brrerwey. 
(With Plate.) 
Un May 28th a young specimen of Aesculus Pavia growing 
in the Royal Botanic Gardens, Kew, was observed to be in. an 
unhealthy condition. The leaves were ‘thoroughly wilted and 
the tree was apparently suffering from the effects of extreme 
drought. Several specimens of Aesculus sp. were standing in the 
immediate vicinity and as these seemed to be perfectly ‘healthy 
with turgid extended leaves, a closer examination of the original 
tree was made. Around the base of the main stem was a 
ance from that surrounding the neighbouring trees. Abou 
they were large and tumescent (Pl. vii. Fig. 1, b, c). The 
diseased tree was about four and a half metres in height and of 
a moderately strong and vigorous growth. Its age was six 
years, and the affected region of the stem had a diameter of 
45 cms. On May 31st the specimen was taken from the ground 
and photographed (Pl. vii. Figs. 1 and 2). 
The diagnosis appeared perfectly straightforward and simple, 
and the death of the tree was attributed to an invasion of the 
main stem by Botrytis, which, plugging the conducting 
elements, effectively cut off the water supply to the upper portion 
of the tree, giving rise to the symptoms of extreme drought. 
This barrier would cause an excess of food material to accumu- 
late immediately below the diseased region and in consequence 
the latent or adventitious buds situated here would be stimulated 
inte active development, and a circle of new and vigorous shoots 
* All the colour terms used are in accordance with Ridgway, R., “ Color 
B2 
