88 
The disoose. was exceptionally ary alt in the South of England 
during the season following the very cold winter of 1894-95. 
Trequodtly tha disease is at first ‘confined to one or few branches 
of a tree, but it spreads quickly, a spores being washed from 
diseased to healthy portions. During seasons when the disease is 
especially abundant, it is not Foal for the trees to lose all 
their leaves before ‘midsummer. Later in the season a second 
crop of leaves appears, and these are not — by the fungus ; 
nevertheless a considerable amount of injury is done, the crop 
of fruit in such — is practically Paltieloas and the wood is 
imperfectly matur 
Nursery stock that has suffered from the disease is worthless. 
Hxoascus deformans is a very primitive oe of the enormous 
assemblage of fungi known as Ascomycetes, which are charac- 
terised by having the spores produced within large cells or asci. 
These asci are —— = considerable numbers, and are usually 
imbedded in, or surroun Be a gpecia! protective ae ie: as 
in truffles, ares &e. But n the present species, the s 
unaccompanied by any kind of protective covering whatever 
Protective measures.—Leaf-curl is a disease which, if 
wards in a branch from the point of infection, but follows the 
young growth, consequently all diseased branches should be cut 
produce fruit, but only fungus spore, and these infect other 
healthy branche 
Diseased fallen leaves should be collected and burned. 
Where the disease has been present in the preceding season the 
trees should be sprayed with dilute Bordeaux mixture just when 
the Jeaf-buds are expanding, to guard agaist infection from 
oating spores. 
Fig. 1, Diseased peach leaves; nat. size. Fig. 2, Section of 
; a leaf, showing the asci seated upon the epidermis and 
bursting aiawagt the cuticle; x 400. 
III, SYCAMORE LEAF-BLOTCH. 
(Rhytisma acerinum, Fries.) 
(With Plate.) 
The on rar black spots so common on the a surface of 
living leaves of Acer Pseudo-platanus (sycamore), A, campestre 
