128 FUNGOID PESTS OF CULTIVATED PLANTS. 



the fruit. These conceptacles are attached by delicate threads to the 

 mycelium, and above these, in a circle around the receptacle, are ranged 

 a circle of radiating arms or appendages, usually six or seven, standing 

 out from the sphere. These are tawny below and colourless above, 

 divided in a forked manner three or four times at the apex. Each 

 receptacle contains a pear-shaped hyaline sac, or ascus, which holds the 

 eight ovate sporidia. The variety which occurs upon Cherry leaves 

 differs chiefly in having from eighteen to twenty appendages around the 

 receptacle. 



This is an epiphyte, and hence, like many of its kindred, may be 

 amenable to the sulphur treatment. 



Common through the whole of Europe and North America. 



Sacc. Sijll. i. p. 3; Cooke Hdbk. No. 1916, fig. 315; Cooke M. F. 

 p. 239. 



CHERRY BROWN ROT. 

 Monilia fructigena (Pers.), PI. X. fig. 12. 



This is the same disease which has been referred to in connection 

 with the Apple, and also as the Apricot brown rot. However it rarely 

 attacks Cherries in this country, although prevalent in the United States. 



For fuller details see " Apricot Brown Hot," p. 135. 



CHERRY-LEAF SPOT. 

 Coryneiim Beijerinckii (Oud.), PI. XI. fig. 22. 



The attacks of this fungus have been recognised in at least two 

 different ways in one as a leaf parasite and in the other as the main 

 cause of gummosis. Under the former aspect it has been found on 

 Cherry, Peach, Apricot, Almond, and Plum. In the spring the young 

 leaves are found to exhibit red or rosy spots on the under surface as well 

 as on the young shoots. Later on the tissue in such places turns brown 

 and dies, when the fungus appears in minute black dots which are 

 grouped on the dead spots, and in these the conidia are produced. 



The dots, or pustules, are at first developed beneath the cuticle, 

 forming compact discs, which are at length erumpent. The conidia are 

 seated upon a kind of cushion or stroma, crowded together, and are oblong, 

 pale olive, with three septa (28 - 32 x 11 - 13 /) on hyaline pedicels. 



-Later in the season a second form of fruit appears, and ultimately it 

 is believed that another form appears, which has been called Ascospora 

 Beijerinckii, wherein the spores are enclosed in asci. 



This disease has been recognised in the Netherlands as well as in 

 Britain. 



No remedies have yet been pronounced successful, but probably spray- 

 ing at the earliest period when there is any indication of the presence of 

 the disease may be effectual. 



Sacc. Syll. iii. 4058 ; Mass. PL Dis. 294. 



GUMMOSIS. 



Gummosis is not by any means a new or uncommon disease, which 

 has been attributed to various causes and latterly to the presence of a 



