THE APPLE-GUM BIMIA. 113 



of all weedy and partly-dead trees, the latter being the 

 great resort of 'borers, to say nothing of the white ants, 

 which, in this decaying timber, live and rapidly increase, 

 only to spread a similar trouble to other and better 

 timbers. All thinnings, when practicable, should be 

 burned, thereby killing off countless numbers of insects, 

 and also greatly lessening the risk of bush fires. 



When a forest tree is badly attacked, the only remedy 

 is to cut it down (grubbing it out would be better) and 

 get rid of it as soon as possible. Where eucalypts, 

 acacias, etc., are artificially cultivated, they can often 

 be watched, and, if found to be attacked, a good spraying 

 with kerosene emulsion will kill off all scale at any 

 rate; as, once get a gum scaly, it soon loses its vigor, 

 and is thus an easy prey to borers all and sundry. 



