18 DESTRUCTIVE INSECTS OF VICTORIA : 



How this insect got here from New South Wales is not 

 difficult to conjecture; I feel certain that the pupse were 

 introduced on young orange trees, the trade in which is 

 very large and important. I am indebted to Mr. A. F. 

 Thiele, the well-known Doncaster orchardist, for having 

 first brought this insect under notice when found attacking 

 orange trees in his district. With the extension of orange 

 growing in this State, it is not unlikely that other of the 

 New South Wales and Queensland pests may be introduced, 

 so that a careful inspection of all young citrus trees coming 

 should be made at the port of shipment and on arrival in 

 Victoria. 



Prevention and Remedies. 



Fortunately for our growers, this beautiful butterfly is 

 not common in Victoria, and an occasional look over the 

 foliage is about the best preventive, as the caterpillars are 

 easily seen, and can be destroyed. The perfect insect, as 

 our plate shows, is conspicuous, and may be caught by 

 means of a roughly -made net, so as to prevent egg -lay ing. 

 Should the caterpillars be plentiful, hand-picking would, 

 of course, be out of the question, but an occasional spraying 

 with arsenate of lead or Paris green would suffice for the 

 purpose ; 1 Ib. of the latter, and 4 Ibs. of lime to 180 

 gallons of water for orange foliage. 



The pupse of this butterfly appear liable to the attack of 

 insect parasites. Fig. V. shows a pupa with hole on side. 

 Mr. H. Tryon remarks that an hemipterous insect belonging 

 to the family Halydidce has been observed by him to attack 

 the caterpillars of this butterfly as they fed on a young 

 plant. It inserted its rostrum or beak into the flesh of 

 the caterpillar, and then sucked its body juices. Mr. Tryon 

 also speaks of having bred large dipterous insects belonging 

 to the genus Tachinus from caterpillars of Papilio erectheus, 

 called by Anderson and Spry the Orchard Swallow Tail. 

 This latter butterfly is rare in Victoria, but common in 

 New South Wales and Queensland, where it is a bad enemy 

 of the orange grower. There is a third species of Papilio 



