105 



The black line scale (Ischnaspis longirosiris, Sign.) 

 generally occurs on old leaves and on the fruit (Fig. 120). 

 It is not a serious pest of cocoa-nuts, but often occurs in 

 great numbers on other palms. Ib takes its common name 

 from its black colour and its long, narrow shape. 



Fig-. 120. Black line scale. 

 Enlarged. (Imperial Dept. Agric ) 



The cocoa-nut white fly (Aleyrodicus cocois, Curtis) 

 occurs as a serious pest of cocoa- nuts in many parts of 

 tropical America. In Barbados, it has been considered 

 largely responsible for the decrease in the number of 

 cocoa-nut trees on the leeward side of the island. Ib is 

 often to be found associated with the scale insects 



Fig*. 121. Cocoa nut white fly. 



Immature insects, and white wax on palm leaf. 



Enlarged U limes natural size. (Original.) 



