44" 



DISEASES OF CULTIVATED PLANTS 



Pods that are severely attacked are often contorted or 

 twisted, and in such instances the mycelium frequently 

 passes quite through the pod and infects the beans. 



The conidiophores burst through 

 the epidermis in tufts on the diseased 

 spots, cylindrical, simple, 45-55 /* 

 long ; conidia apical, oblong, ends 

 rounded, straight or curved, hyaline, 



is-^x 3*5-5 "5 P\ S P ines few in 

 number, or sometimes absent, dark 



coloured. 



Professor Halsted says this fungus 

 is also parasitic on cucumbers, 

 pumpkins, water-melons and musk- 

 melons. If this is correct it may 

 also endanger cucumbers, vegetable 

 marrows, and melons, in this country. 



Spraying with Bordeaux mixture 

 early in the season will either check 

 or prevent the appearance of the 

 disease. This cannot be continued 

 after the plants commence to bloom. 

 Diseased pods and leaves should be 

 removed. Seed showing traces of 

 infection should not be sown. A 

 damp situation favours the spread 

 of the fungus. 



Halsted, Bull. Tor rey Bo/., 20, 

 p. 246. 



Massee, Gard. C/iron., May 7, 

 1898. 



Voglino, Fungi dannosi alle Piante 

 Coltivale, pi. 8. 



Witches' brooms of cacao. In 



1900 Ritzema Bos announced the 



presence of a serious disease of the 



cacao-tree, which appeared under 



the guise of witches' brooms, which 



s he named Exoascus thcobromae. I 



d specimens of the same disease from 



Mr. Hart of Trinidad to Kew, for 



FlC. 1 \6.~Collelotrichu111 lindt- 

 muthianum. I, diseased pod of 

 v. arlct-runner ; _\ section through 

 a pustule of the fungus showing 

 conidiojjliorcs bearing conidia at 

 their lips, also two long, sterile- 

 spines, which should have been 

 dark in colour, highly mag. 



he attributed to a fungu 

 soon afterwards examine 

 Surinam, forwarded by 



