240 DISEASES OF CROP-PLANTS 



RosELLiNiA Root Disease. 



Nutmeg trees are among the numerous hosts of Rosellinia 

 spp. (See Chapter XV.) 



Thread Blight, 

 The nutmeg is very subject to thread bhght caused by 

 Corticium Stevensii, described on page i6i. Humidity is the 

 chief predisposing cause of its prevalence and its effects are 

 commonly increased by close planting. The amount of loss is 

 probably always far too low to justify the expense of spraying, 

 which apart from reducing shelter is the only remedy. 



