L 1 B ii A 



UNIVERSITY Of 



CALIFORNIA. 



CHAPTER XXIII. 



Diseases incident to plants Classification by Tournefort 

 Enemies of coffee Bug The black bug Mode of pro- 

 pagation Treatment recommended The white bug 

 Affects dry situations The borer Its appearance in 

 Coorg Treatment Probable causes The leaf disease 

 Its character Its effects Its causes Pellicularia 

 " Stump "The rot Grubs Rats Grasshoppers. 



LIKE the members of the animal kingdom, plants 

 are subject to diseases. They have, likewise, nume- 

 rous enemies, which attack and prey upon them in 

 various ways. Protection is, therefore, required 

 against these hostile influences, or remedies where 

 prevention has failed, and the discovery of such 

 remedies, or means of prevention, should be one of 

 the pursuits of every cultivator. 



The first step in this direction, it is clear, must 

 be to obtain as close and accurate a knowledge as 

 possible of the nature of the enemies and diseases 

 by which plants are assailed. 



A deranged circulation of the sap is brought 

 about by such causes as unsuitability of soil or 



