PESTS* 



application of lead arseniate is effectual, but as there is usually a succes- 

 sion of egg-laying- females, one application is not sufficient, and it is 

 simpler to pick them by hand. Another butterfly 1 with an almost 





FIG. 197. 

 Lemon Butterfly. 



identical life history is found attacking citrus plants but is apparently 

 less common. 



Insect Pests of the Orange. 



Orange and other citrus trees all the world over are infested with 

 scale insects and mealy wings, some being extremely virulent pests. 

 These are not lacking in India, though they do not work a tithe of the 

 damage caused elsewhere. In the Himalayas as in Calcutta, the leaves 

 are covered with a small yellowish oval scale 2 from which a mealy-wing 

 fly emerges ; in Western India, a black oval scale takes its place, belong- 

 ing equally to the mealy-wings. Both these species weaken the plant, 

 extracting the sap and slowly killing the branches. True scale insects 

 also infest these plants but they are apparently rarer. For these pests 

 there is nothing better than a good spraying with a rosin wash ; the whole 

 plant must be carefully sprayed especially the under-surface of the leaves. 



Another pest of the orange is a large moth, 3 which pierces the rind 

 of this and other fruits with its powerful proboscis in order to extract 



1 195. Papilio pammon. L. (Papilioindee.) | 2 Aleurodes eugenics, var. Aurantii. Mask. 

 8 Ophideres fullonica. L. (Noctuidee.) 



N 



