THE PESTS AND DISEASES OF THE CANE. 



pleasant odour reminiscent of pine-apples. A fungus, Thielaviopsis ethaceticus, 

 was found by Went to be the cause of the disease. Cultures made from diseased 



X600 



Fio. 74. 



canes remain white for from twelve to twenty-four hours and then turn olive- 

 green ; this colour is due to macroconidia situated in the special cells at the ends 

 of short branches of the mycelium. Microconidia are also formed in chains of 



149 



