THE FUSARIUMS FROM CANKERED CACAO-BARK 

 AND NEGTRIA CANCRI NOVA SPECIES 



BY 



A. A. L. RUTGERS. 



With Plates IX— XII. 



When investigating the cause of cacao-canker in Java ^), 

 fungi have been isolated from the diseased bark of 15 different 

 cacao-trees; all of these appeared to belong to the genus 

 Fusarium. 



These fungi are not the cause of cacao-canker, although al- 

 ways present in diseased bark; the causative fungus in Java ^) 

 is Phytophthora Faheri Maubl., just as has been proved to be 

 the case hi Trinidad ^) and Ceylon ^). 



The 15 strains of Fusarium, obtained in this way, were 

 grown in pure cultures for comparison with original cultures 

 of different Fiisarium-sipecieii, obtained from the "Centralstelle 

 fiir Pilzkulturen" in Amsterdam. 



At first sight 15 strains seemed not only all Fusariums, but 

 even the same species of Fusarium; later on it became evident, 

 that two groups could be distinguished, different as to the form 



1) Rutgers, A. A. L., Onderzoekingen over den Cacaokanker (With a summary 

 jn English) Meded. n°. 1 van de Afd. v. Plantenziekten. Dep. v. L. N. en H. in 

 N. I. 191 '2. 



2) RoRER, J. B , The relation of black-rot of cacao-pods to the canker of cacao- 

 trees. Bull. Misc. Inf. Trinidad. 9. 1910, p. 38. 



3) Fetch, T., Cacao and Hevea canker. Circ. Roy. hot. Gardens, Ceylon, X, 13, 1910. 



