30 



DISEASES OF CROP-PLANTS 



years been found to be wide-spread in the West Indies, in which 

 fruits and seeds are infected with fungi of what appears to be 

 a highly speciaUsed group by way of the punctures of plant- 

 feeding bugs (Heteroptera). The experiments which have been 



Fig. 6 Stigmatomycosis. Species C 



made indicate that the infection is actually conveyed by the 

 bug from plant to plant. 



For disease of this kind the term stigmatomycosis is proposed, 

 a typical example being the internal boll disease of cotton 

 described in Chap. XXV. Two of the fungi concerned, or species 



Fig. 7 Stigmatomycosis. Species D (Nematospora) 



closel}?^ resembling them, had been previouslj^ met with ; one 

 of them, Eremothecium cymbalaria Borzi, corresponding with 

 the writer's Species B, was found in Italy in i888 in capsules 

 of Linaria cymhalaria and rediscovered in France in 1906-12 

 in fruits of Cachrys IcBvigata : the other ^ Nemaiospora Coryli 



