79 



the orange red scale {Chrysomphalns aurantii, Mask.). 



A 5 



Fig; 85. Orange red scale. 

 Enlarged. (Imperial Dept. Auric.) 



This scale is also circular 

 in outline, but differs from 

 the red-spotted scale in being 

 less convex and of a lighter 

 colour, and without the dis- 

 tinctive dark central boss. 

 The scale covering is more 

 delicate and more transparent 

 also in the case of the red 

 scale (Fig. 85). 



The insect occurs on both leaves and twigs, often in 

 sufficient numbers to cause the death of the tree. 



the lantana bug (Orthezia insignis, Douglas). 



This is a black insect 

 nearly covered with white 

 wax ; the back being 

 partly naked, with two 

 lines of white wax running 

 lengthwise (Fig. 86). The 

 body of the mature 

 female terminates behind 

 in an egg sac of white 

 wax, which is curved up 

 and may be as long as the 

 Fig. 86. Lantana bug. insect itself. 



Enlarged. {Imperial Dept. Agric.) 



Control. The scale insects which attack citrus plants 

 in the West Indies are largely controlled by natural 

 enemies. The effect of hymenopterous parasites, predace- 

 ous insects and mites, and of entomophagous fungi is very 

 beneficial, and it is not as necessary to apply insecticides 

 for the control of these pests as in many countries. If, 

 however, the attack of scale becomes serious and shows no 

 sign of decreasing in severity, spraying with any of the 

 recognized contact insecticides will be found of value. 



The spray mixtures containing rosin are useful 

 for the purple, the red-spotted, the red, the chaff and 

 the green scales, while whale-oil soap is best to use in 

 connexion with the snow scale and the Lantana bug. 



