446 PLANT DISEASES 



The disease occurs in Costa Rica, Venezuela, Guatemala, 

 and New Granada. 



Preventive Means. — Although by no means a new 

 disease, no serious attempt appears to have been made 

 to arrest its progress. Being quite superficial, it is quite 

 probable that spraying with Bordeaux mixture, or with 

 ammoniacal solution of carbonate of copper, would prove 

 effective. All diseased leaves and fruit should be collected 

 and burned, otherwise spraying is of little avail. 



Stilbum flavidum, Cooke, Grev., 1880, p. 11. — Forming 

 circular bleached spots on living leaves, the bleached 

 patches pass quite through the leaf; sporophores occur 

 on upper surface of the leaf, gregarious on the patches, 

 very minute, entirely clear yellow, 1-2 mm. high, stem 

 very slender, straight, or flexuous, head globose; conidia 

 elliptical or subglobose, 2-2 "5 x i"5-2 /x. 



This is considered by Spegazzini to be a Basidiomycete, 

 and renamed Pistillma flavida ; however, I have failed to 

 find basidia, and so prefer to retain the species under 

 Stilbum. 



