WILT, OR STEM ROT. 



its effects, and there can be no doubt as to the re- 

 lation of the particular species to the disease in 



51 Rooted Campbell cuttings, showing effects of Thielavia 



on the roots. Plant on left diseased, plant on 



right healthy. 



question. The fungus is known as Thielavia 

 basicola Zopf, and it attacks other plants be- 



