577 



the trees upon which it was found were at once destroyed by 

 burning them, so it may be hoped that the State is again free from 

 this scale. In Italy, it is one of the most serious pests of the 

 citrus trees, and causes a great amount of damage. It had also at 

 one time been a serious pest of the citrus trees of the Hawaiian 

 Islands, but on the introduction of the Australian lady-bird (Orcus 

 chalybeus) to those islands, it soon became. a harmless form, and is 

 no longer noticed there. 



Remedy. Fumigate with No. 18. Spraying against this scale 

 has been of no use in Italy. 



RMzococcus araucariae, Maskell. 



This coccus is a very common pest of the Norfolk Island pine 

 (Araucaria excelsior'), and two years ago some trees in one of the 

 gardens in Perth were found very badly infested with it ; but the 

 introduction of the lady-bird (Cryptoleamus montrouzieri) from the 

 Eastern States, has rid the trees of this scale. 



WHITE COTTONY CUSHION SCALE (Icerya purchasi, Maskell). 



Scattered specimens of this scale insect are often met with in 

 this State. It has a very wide range of food plants, and has been 

 a very serious pest in other parts of the world. In Australia, it 

 has never been known to do any damage, being held in complete 

 subjection by the little lady-bird (Novius cardinalis) , and an 

 internal parasite (Lestophonus iceryae). This scale is indigenous 

 to Australia. 



White Cottony Cushion Scale (Icerya purchasi, Maskell). 

 Icerya purchasi a, scale enlarged, showing larva of Novius at 

 work: b, pupa of Novius ; c, Novius; d. scale natural size. 

 (After C. L. Marlatt). 



Remedy. The destruction of this scale should be left to its 

 parasites. 



