78 



the green scale (Coccus riridi.% Green). 



The green scale is probably .also of fairly recent 

 introduction to the West Indies. It was identified in 1905, 

 and has since been recorded from nearly all West Indian 

 islands. It is a small, flat, green scale which occurs on 

 the under side of the leaves of citrus trees, generally 

 closely packed along the mid rib. It is also seen on the 

 leaf petiole and on the tender twigs. Young limes are 

 often severely attacked by the green scale, and this attack 

 is usually followed by the purple scale. The cause of the 

 diminution of the green scale after such an attack has 

 not been determined, but it is probably some parasitic 

 organism. The green scale is also controlled to a consider- 

 able extent by a parasitic fungus, the shield scale fungus 

 (Cephalosporium lecanii). 



the red-spotted scale (Chrysomphalus aonidum, L.). 



The red-spotted scale is a brownish or purplish scale 

 insect with a circular outline, more convex than other 

 scales on citrus. (Fig. 84.) The apex or central boss is 



Fig. 84. Red-spotted scale. 



Enlarged. ( Original. ) 



reddish, and it is this feature that gives the common name 

 to the insect. The red-spotted scale occurs on the under 

 surface of the leaf. This insect is not often a serious pest, 

 although it sometimes occurs in considerable numbers on 

 nursery stock and young plants, 



