ROOT KNOT NEMATODE INFESTATION 25 



Ritchie 1926 (218): Infestation is becoming serious in the Congo; consider- 

 able damage in new plantings. 



Thierry 1900 {228): Infested plants may appear vigorous, but they require 

 good nutrition in order to form new superficial roots as the older roots 

 die. Martinique. 



Zimmermann 1900 (268): Apparently resistant in Java; root knot could not 

 be identified on any coffee roots, although weeds were found infested 

 in many plantations; experimental inoculation of four plants in two pots 

 was twice negative. 



1903 (269): Many young trees infested in seedbeds, but when set 



out they grew vigorously and in some cases the galls seemed to disap- 

 pear; no galls were found on coffee growing near heavily infested lupine 

 Tanganyika (German East Africa). 



Coflfea canephora. 



Ghesquiere 1921 (86): "Var. Sankuruensis" is infested but seems somewhat 

 "resistant." Belgian Congo. 



Coffea excelsa. 



Ghesquiere 1921 (86): Found infested but seems somewhat "resistant." 

 Belgian Congo. 



Coffea liberica, Liberian coffee. (N) 



Bordaz 1914 (21): Only Liberian and robusta coffees remain in Martinique; 

 the eelworms attack Arabian coffee especially. 



Bouquet de la Grye 1899 (22): Not attacked (quoting Thierry's (228) 

 work) . 



Ghesquiere 1921 (86): Infested, but seems somewhat "resistant." Belgian 

 Congo. 



Goldi 1888 (98): More hardy, but does not escape the disease. Brazil. 

 [Question: Which disease? Goldi concluded that the chronic form of the 

 coffee disease differed only in intensity from the acute form, which 

 killed trees without warning in 8 to 15 days and was obviously not 

 caused primarily by root knot; he gave root galls, however, as a char- 

 acteristic of "the disease."] 



Sardelys 1902 (208): " Meloidogyne exigua" was definitely determined on 

 "C. liberica hybrids" which died suddenly. Madagascar. [M. exigua is the 

 name given by Goldi (98) to the root knot nematode, but Sardelys took 

 it for the name of a disease caused by the nematode "Tylenchus coffeae"; 

 the basis of his diagnosis is left obscure; the lack of original observations 

 is concealed in a mass of generalities, mostly taken from other authors. 

 Delacroix (in 208) answered this letter without seeing the specimens 

 and assumed that the disease was root knot.] 



Thierry 1900 (228): Not attacked; observations and experiments appear 

 entirely conclusive; C. arabica can be grafted onto these resistant roots. 

 Martinique. 



Zimmermann 1900 (268): Not found infested in Java. 



1903 (269) : Galls observed on young plants. Tanganyika (German 



East Africa). 



Coffea myrtifolia. 



Ritchie 1926 (218): Is being considered in the Congo as a rootstock because 

 of its resistance. 



Coffea robusta. (N) 

 Bally 1927 (7): Infestation in Java only sporadic. 

 and Reydon 1931 (8): No infestation found on roots inoculated with 



galls from tobacco and indigo. Java. 

 Bordaz 1914 (21): Only Liberian and robusta coffees remain in Martinique; 



the eelworms attack Arabian coffee especially. 

 Ceylon Department of Agriculture 1936 (33): Seedlings listed among 



plants attacked in Ceylon. 

 Cramer 1906 (49): Coffee is subject to two nematode diseases. Netherland 



East Indies. [This paper shows no first-hand knowledge except that 



C. robusta was suffering from some serious disease.] 

 Ghesquiere 1921 (86): Found infested in Belgian Congo. 



