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. lb 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. It 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 H times natural size. {Original.) 



