718 Agricultural Gazette of N.S.W. [Oct. 2, 1920. 



The ground from which trees are removed should receive a generous 

 dressing with quicklime, and the soil should be repeatedly turned over and 

 exposed to the sun and allowed to remain idle for tvvelve months. 



Growers should carefully examine all young trees before planting, and 

 reject those showing any suspicious outgrowths. 



Nurserymen can safeguard the grower by dipping grafts just before 

 planting in a thick bluestone paste. This method of treatment has given 

 satisfactory results in America, one company having treated 500,000 apple- 

 trees in one year. The bluestone paste can be made as fullows : — 

 l^ lb. copper sulphate (bluestone). 

 4 lb. quicklime. 

 IJ gallon water. 

 Dissolve the bluestone in portion of the water and the lime in the 

 remainder, and then mix both together to make the paste. • 



To Protect Stored Maize and Wheat from Weevil. 



The cheapest method of treating a large quantity of t^rain in bags to protect it 

 from weevil is to fumigate it in lots of twehe to twenty bags at a time, pour- 

 ing into the top of each bag 1 to 2 fluid oz. of liquid carbon bisulphide, placing 

 the bags side by side on a tarpaulin or canvas sheet, and thi-n folding over 

 the sides of the sheet so as to overlap tightly, and cohering the whole with 

 bags or another tarpaulin to further help to keep in the fumes. A " tryer " 

 (sampler) serves as a useful funnel for running in the liquid, the heavy fumes 

 of which sink down through the grain. Each lot df bags shoidd be exposed 

 to the fumes for not longer than twenty-four hours. Neither the liquid nor 

 fumes, used as above directed, will afli'ect the grain for food or seed. 



Fimiigation .should be carried out, if possible, on a warm day (say with a 

 temperature of 70 degrees Fah.), as at a temperature below 60 degrees Fab. 

 the fumes become less effective. The bulk of the weevils will be killed by 

 this process, but the bags should be inspected every two months, and if they 

 show signs of re-infestation they should be given further treatment. Care 

 should be taken that no fires, lights, or lighted pipes or cigarettes are neai 

 when handling the liquid or fumigating, as the fumes are inflammaiile. 



If an empty galvanized i>on water tank is available, it may be used with 

 advantage in place of tarpaulins, as the lid can be staled (by placing a ring 

 of rubber tubing or a bag under it) and kept down by Aveights when the 

 infested grain has been emptied in. Moreovt-r, as in such a i-eceptacle the 

 fumes are much more efiFectively held, only 1 oz. of liquid to four bags 

 (that is, to every 15 cubic feet of space in the tank) need be used. 



Carbon bisulphide costs Is. 6d. pt^r lb. if puichased in small (piantities, 

 but it may be purchased more cheaply in 1 -gallon tins, and more cheaply 

 still if a number of such tins are bought at a time. 



It may be added that maize has been successfidly stored and kept free 

 from weevils for a long period at (ii'afton Experiment Farm by u>ing jMir-e 

 dry carbon dioxide gas from cylinders, at a cost of only Id. per bushel for 

 gas. — W. B. GuRNKV, Assistant Entomologist. 



