486 



Journal of Agriculture , Victoria 



lo Aug., 1912. 



They 



and (lo a great amount of good in kee|)ing insect pests in ciieck. 

 should therefore be protected. 



As mealy bugs are very destructive to our \ahiable wattles, a sharp 

 look-out should be kept for them. and. if seen, it would be ad^■isable to 

 spray with weak kerosene emulsion, benzole emulsion, or red oil. 



3. MEALY BUGS UN JkLiNK AND STEMS OF NATIVE CHERRY TREE. 



Specimens of the insects mentioned in this short article can be seen at 

 the Entomological and Ornithological Museum belonging to the Agricultural 

 Department. 



ARSENATE OF LEAD. 



For the purpose of comparison and guidance to all interested in this 

 spray, an examination has been made of the different brands obtainable 

 OR the market at the present time. This list, as can be seen, is of a 

 fairly comprehensive character, as it contains not only the ordinarv moist 

 samples, but also some of the dry powder, which would appear to be 

 iriaking some headway — there being three different brands of that grade. 

 The ordinary samples are evidently made, some by using Acetate of Lead 

 and others by using Nitrate of Lead, as the lead base. 



A pure dry sample of Arsenate of Lead made by the use of these 

 ingredients, by calculation, would give the following percentages : — 



Arsenic Acid. Oxide of Lead. 



Arsenate of Soda + Acetate of Lead .. 30-07 per cent. .. 69-93 per cent. 



Arsenate of Soda + Nitrate of Lead .. 34-94 „ .. 65-60 



