GLOEOSPORIUM 437 



Pustules of conidia produced on diseased patches, originat- 

 ing beneath the epidermis through which they push, densely 

 gregarious, originating from a thin stroma, the uppermost 

 cells of which are more or less pointed, and bear the oblong 

 or ellipsoid, hyaline conidia which average 5-6 X 3*5 p. 



Prillieux recommends a thorough drenching of the vines, 

 before the buds commence to swell, with a solution of sul- 

 phate of iron. After expansion of the foliage, dusting with 

 flowers of sulphur, to which a small quantity of powdered 

 quicklime is added, checks the germination of spores. Dis- 

 eased leaves, fruit, and shoots should be promptly removed. 

 Rich stable manure favours the disease. 



Massee, Gard. Chron.^ Feb. 2 (1895). 



Prillieux, Malad. des Plantes Agric., 2 p. 309 (1897). 



Viala, Malad. de la Vigne, Ed. 3, p. 204. 



Lime leaf spot. Dr. Laubert has recorded a destructive 

 disease attacking species of Tilia in Germany. The foliage 

 is the part mostly attacked. Irregularly shaped patches of a 

 yellowish or brownish-yellow colour are present on the leaf, 

 and often run down the two sides of the larger veins, the 

 spots have usually a darker border, and the minute black 

 patches of fungus fruit are developed on the spots on the 

 upper surface of the leaf. Diseased spots also occur on the 

 leaf-stalks and young shoots. The fungus causing this disease 

 is Gloeosporium tiliaceum (Allescher) (syn. G. Tiliae maculi- 

 colum, Allescher). The disease spreads rapidly, and by the 

 end of May the majority of the leaves have fallen and not a 

 green leaf can be seen on the diseased trees. This occurred 

 in the Tiergarten in Berlin and in many other places. 



Conidia longish, elliptic-oval, or egg-shaped, hyaline, con- 

 tinuous, often slightly curved, io-i8X4-6//. 



The above differs from a somewhat similar disease of lime- 

 trees in Denmark, caused by Gloeosporium tiliae (Oudem.), as 

 described by Rostrup. In the latter the spots on the upper 

 side of the leaf are large, brown, and with a blackish border ; 

 on the under surface red-brown, and studded with the fruit 

 of the fungus. Blackish patches also occur on the leaf-stalk 

 and midrib. 



It is considered that the parasite winters in diseased shoots, 

 which can be recognised by the presence of sunken, blackish 

 patches. From these spots spores are produced in the spring, 



