138 FUNGOID PESTS OF CULTIVATED PLANTS. 



FIG-TBEE CANKEK. 

 Liber tella ulcer ata (Mass.). 



This is a disease which has recently been recognised as causing 

 cracking and canker in the bark of Fig trees and shelling off large patches 

 as the disease progresses. 



The fruit of the fungus is produced within minute cavities of the bark, 

 and the very small conidia ooze out to the surface like fine hairs, which 

 are composed of conidia stuck together by a tenacious gluten which 

 becomes dissolved by moisture and liberates the exceedingly small conidia. 

 These conidia obtain an entrance into the bark through wounds, and 

 thus the disease is spread. 



It is recommended that all wounded surfaces should be coated with 

 tar at once. By no means should any knife be used in pruning or 

 trimming which has been employed in cutting out diseased parts until it 

 has been cleaned and disinfected, as a knife with adhering germs has 

 been known to infect a healthy tree. 



Gard. Mag. July 23, 1898, fig. ; Mass. PI. Dis. 292. 



FIG GREY MOULD. 

 Botrytis cinerea (Pers.). 



Only recently we have been made acquainted with the serious injury 

 inflicted on green Figs by the attacks of a grey mould, which it is difficult 

 to distinguish specifically from Botrytis cinetea. The mould appears in 

 grey velvety patches at the apex of the fruit, being preceded by a soften- 

 ing and rotting appearance of the tissues, which are soon reduced to a 

 pulpy mass. No trace of sclerotia has yet been observed. 



The sterile hyphae are creeping, interwoven ; the fertile are erect, 

 gregarious in broad patches, of a greyish colour, either simple or sparingly 

 branched, with several short simple or divided branchlets near the apex, 

 septate, a little constricted at the septa, smoky-brown (about 12-14 p 

 thick) ; conidia broadly elliptical or almost subglobose, nearly colourless 

 (10-12 // diam.), collected in somewhat globose heads. 



It is hopeless to dream of saving the fruit when once attacked, but 

 all diseased fruits should be burnt at once to prevent diffusion of the 

 conidia. Spraying uninjured fruit may save them from attack. 



Mass. PI. Dis. 380 ; Cooke Hdbk. No. 1801. 



MULBERRY-LEAF SPOT. 

 Phleospora Mori (Lev.), PL XII. fig. 28. 



Mulberry leaves are sometimes marked by rather large irregular spots 

 or bleached tissue circumscribed with a definite border line of brown. The 

 spots themselves are pale, either dirty white or tinged with ochre. 

 Scattered over the upper surface of the spots numerous black dots 

 indicate the small globose receptacles sunk into the substance of the 

 leaf. 



Within these receptacles are produced the elongated cylindrical conidia 

 or sporules, which are curved, rather obtuse at the ends, and divided 

 across by three septa, or occupied by four guttules, or nuclei, entirely 



