80 DESTRUCTIVE INSECTS OF VICTORIA. 



Scale insects have many parasites^ but, as I said before, 

 I slioiild not advise any grower who is badly troubled 

 with Scale of any kind, to depend too much upon the 

 assistance of parasitic insects ; still they are, without a 

 doubt, valuable auxiliaries, this much having been proved 

 over and over again. 



INIathew Cooke mentions that he believes, in America at 

 least, there is but the one brood in a year. This should be 

 encouraging news for us ; but as a change of climate often 

 causes a change of condition both in plants and animals, 

 we must not trust too much to the chances of its being 

 proved that there is only one brood of the Apple Scale in 

 Victoria, as the fact has yet to be determined by patient 

 observation and research. 



