WILLOW BEETLE. 275 



For application in Willow grounds, the method of opera- 

 tion mentioned in Prof. Eiley's ' Seventh Missouri Report ' 

 (1875, p. 15), appears to be one of the most convenient, and 

 is as follows : — " It consists of a can capable of holding 

 about eight gallons of liquid, and so formed as to rest easily 

 on the back, to which it is fastened knapsack-fashion by 

 adjustable straps, which reach over the shoulder and fasten 

 across the breast. To the lower part of the can are attached 

 two rubber tubes, which are connected with two nozzles or 

 sprinklers. The inside of the can has three shelves, which 

 help to keep the mixture stirred. There is a convenient lever 

 at the bottom, which presses on the tubes and shuts off the 

 outflow at will, and two hooks on the sides near the top on 

 which to hang the tubes when not in use. On the top is a 

 small air-tube and a capped orifice. Two bucketsful of water 

 are first poured into the can, then three tablespoonsful of good 

 green well mixed with another half-bucketful of water, and 

 strained through a funnel-shaped strainer, which accompanies 

 the machine, and the use of which prevents the larger 

 particles of the green from getting into the can and clogging 

 up the sprinkler. Five to eight acres a day can readily be 

 sprinkled by one man using the can, and from one to one and 

 a half pounds of good green, according to the size of the 

 plants, will suffice to the acre." 



In the observations given under the head of Winter Moth 

 (see also Paris-green in Index), which have been made in this 

 country during the present year, there will be found details 

 regarding proportions which it is safe to apply, and inform- 

 ation as to apparatus, &c. 



The chief points are to try, on a small scale, what amount 

 leafage will bear, and to bear in mind that the green acts by 

 poisoning the beetle or grub, not merely by contact, therefore 

 it should be applied so as to fall and rest in the finest possible 

 spray on the leafage, never drip. When dripping begins 

 operations should be stopped. Also, it should always be 

 remembered that Paris- green, being arsenite of copper, and 

 consequently a deadly poison, requires to be kept and also 

 mixed under careful supervision, especially if there are 

 children about, as the beauty of the colour is very attractive. 

 All requisite cautions and warnings are given under heads 

 referred to, but superintendents should always see that their 

 workers do not carelessly expose themselves to drawing in the 

 powder in breathing, whilst mixing or weighing it out. There 

 is not the slightest occasion for this, for the powder may be 

 purchased damped, or weighed out in pound packages, so that 

 it can be put in water by measure as needed. With common care 

 the green can be used with perfect safety; but if workers will not 



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