90 DESTRUCTIVE INSECTS OF VICTORIA: 



recommended by excellent authorities, I am quite in 

 accord with the opinion of our greatest authority, the late 

 Professor Riley, when he states that kerosene, if properly 

 handled and administered, is the best of all insect 

 destroyers. Of late years, however, the cyanide gas 

 treatment has found great favour in America and else- 

 where, where it is of great use, especially in nurseries 

 and on trees of the citrus family. (I must refer you to 

 Part I. for lengthy descriptions and illustrations of the 

 tents used for this purpose.) But, so far as our own 

 experience goes, we have found that kerosene will, if 

 carefully used, do all which is necessary for the eradica- 

 tion of this or any other insects of a similar nature. 



Mr. Froggatt has enumerated the before-mentioned 

 American remedies, which are here reproduced from his 

 articles : — 



Winter Spraying. — (1) Kerosene Emulsion. 



Kerosene, 2 gallons. 

 Whale-oil soap, ^ lb. 

 Water, 1 gallon. 



Dissolve the soap in boiling water, add the oil and mix 

 thoroughly, using, if handy, a garden syringe for the 

 purpose ; then add 3 gallons of water to each one of 

 the emulsion, making 12 gallons of spraying mixture. 

 Apply warm. Trees sprayed should be treated twice at 

 least, as the young insects rapidly commence the work of 

 reproduction. 



Winter Spraying. — (2) Lime.^ Salt, and Sulphur 

 Mixture. 



Lime, 40 lbs., unslaked. 

 Sulphur, 20 lbs. 

 Coarse salt, 15 lbs. 

 Water, 40 gallons. 



Take 10 lbs. of lime, 20 lbs. of sulphur, and boil until 

 dissolved. Take the remainder of the lime and salt, slake. 



