37° 



Journal of Agriculfiirc, 1 u 



[lOTH June, 19 12, 



The operator should not put his head inside the tent when placing the- 

 c\anide in the acid, as the fumes are very deadly. As soon as the cyanide 

 is dropped in, the sheet should be quickly closed down and covered. The 

 sheet should be left on for 45 minutes. 



As a certain amount of gas escapes through the sheets, it is advisable 

 when fumigating for the operators to work towards the wind, so that the 

 gas fumes are blown away from them. 



It is inadvisable to fumigate when it is very windv, or when the sun 

 is hot. There is also a danger of burning if the foliage is wet. 



Time for Fumigation. 

 The best time to fumigate is in March. I have found that both the 

 Red and Olive Scales are much more easily destroyed at this time of the- 

 year than when the cold weather sets in. This applies particularly to the- 



CHARGING. 



Olive Scale, as in jNIarch and early April the majority of the scales are- 

 young, and easily destroyed. The foliage, too, at this season is tougher, 

 and not so liable to injury. On the other hand, in Spring and early 

 Summer, the foliage is tender, the insects more difficult to- destroy, and if 

 a few escape destruction, they multiply during the late Summer and 

 Autumn. The Red Scale can be effectively treated in Winter, but the 

 ground is then sloppy, and the weather usually unfavorable. 



Another objection to winter treatment is that, although the scale on 

 the fruit is killed, it will not fall off, whereas, if done in early Autumn, 

 the expanding fruit throws it off before picking time. 



The tables which have been prepared will probably be sufficient for all 

 requirements, but the required charge for larger trees will be found bv 

 .•squaring the diameter, multiplying by \\, then by -i% of the height, and 

 dividing bv 160 for the stronger charge as given in No. i table, or by 



