11 March. 1918.] 



Vin ei/ard Sprat/ing. 



155 



Under the sub-heading '' We need different machines," he comments 

 on the scarcity of labour needed to treat with the desired rapidity. 



" For the first two treatments there is no trouble,* but for the 

 third and subsequent ones, the leaf surface to be treated is con- 

 siderable. To thoroughly wet a vine our workmen easily take 

 twenty to thirty seconds. This is too much; and it is too much 

 because our machines have too small an output. We need spray 

 pumps which can empty themselves two or three times as fast — 

 in other words, nozzles with an output two or three times as great. 

 These do not seem to be difficult to realize. ISTeither have our 

 machines for work on a large scale a sufficient output. A dos de- 



Tig. 20. — Langwill Brothers and Davies' motor-driven Potato Sprayer. The 

 boom supporting the nozzles, which is fixed behind the engine, is not 

 shown in the illustration. 



mulet (pack-horse outfit) sprays about four hectolitres per hectare 

 (40 gallons per acre). If it sprays more it is because the horse 

 advances too slowly — similarly with wheeled machines. With 

 knapsack sprays, the third, fourth, and fifth applications use 8 to 

 12 hectolitres per hectare (80 to 120 gallons per acre). Our 

 larger machines should be able to distribute this same bulk at a 

 horse's ordinary pace. Our constructors, if they are in a position 

 to do so at present, should follow up this trail. It is a question 

 of nozzle and of pressure, which seems to me to be of easy solution." 



From the above will also be gathered some information as to the 

 quantity of spray mixture required per acre under varying conditions. 

 Allowance must, however, be made for the closer planting of Southern 



* Theso will bp found thi» mist vital ones in Victoria. 



