SPHAEROSTILBE 191 



appeared on the white patches present on one of the diseased 

 berries. A few days afterwards, similar perithecia appeared 

 mixed with the Stilbum stage on a second berry. On 

 examination these perithecia proved to be of the Nectria type, 

 but a Nectria that develops along with a Stilbum-like conidial 

 condition, is at the present day referred to the germs 

 Sphaerostilbe. 



The leaves of three young coffee plants, two years old, 

 were infected with the spores of the Sphaerostilbe stage of 

 the fungus, and at the expiration of thirteen days the points 

 of infection became yellowish-green in colour, and during 

 the succeeding week the characteristic white patches, bearing 

 the conidial form of the fungus, were developed. The 

 ascigerous condition did not follow, and it possibly does 

 not develop on the leaves, owing to lack of nutrition, but 

 only on the fruit and shoots. This is what happens in other 

 species of parasites, as Sphaerotheca pannosa, etc. 



Failure attended numerous attempts to infect young leaves 

 with the conidia of the Stilbum phase of the fungus; this 

 has also been the experience of other investigators, in fact 

 no one has yet induced these supposed conidia to germinate, 

 and it is just possible that the conidial condition, although 

 still present, has reached an effete stage, and is no longer 

 of functional value as a reproductive body. 



Stilbum -like conidial stage. Forming white spots on 

 leaves, fruit, and young shoots ; conidiophores gregarious, 

 consisting of a fascicle of hyphae expanding into a head 

 at the apex, each hypha terminated by a swollen cell bearing 

 several slender outgrowths each bearing a minute conidium 

 1-5-2 [x diam., conidiophores 1-2 mm. long, entirely pale 

 yellow. 



Ascigerous stage. Perithecia gregarious, warted, bright 

 red; asci cylindrical, 8-spored; spores hyaline, i-septate, 

 elliptical, ends acute, 15x6-7 fx. 



The most important, practicable measures for eradicating 

 the disease are the following. All diseased shoots should 

 be removed and burned, as the perithecia produced on the 

 bleached spots will furnish spores which will infect fresh 

 leaves, fruit, and shoots. 



All diseased fruit, whether hanging on the trees or lying 

 on the ground, also all dead leaves, should be collected and 

 either burned or deeply buried. Imperfect aeration of the 

 soil, and allowing the lowermost branches to remain on the 



