40 



straining. 



In order to avoid clogging tlie spray nozzles the mixture must be 

 thoroughly strained before it goes into the sprayer. A strainer of 

 brass wire cloth, 20 or 22 meshes to the inch, should be used for 

 this purpose. A very convenient and satisfactory strainer is shown 

 in the accompanying illustration (fig. 22). It consists of (1) a tight 



outer box about 1 foot square, 

 with a heavy bottom, into which 

 a piece of 1^ to 2 inch gas pipe is 

 fitted as an outlet, and (2) an 

 inner box, smaller and lighter, 

 which will drop easily into the 

 outer one. The ware cloth, se- 

 curely fastened, forms the bottom 

 of the inner box, and is sloped 

 at an angle of about 30 to 35 de- 

 grees. The slanting of the sieve 

 prevents clogging, and the remov- 

 ability of the inner box greatlj^ 

 facilitates cleaning. A narrow 

 strip should be nailed about the 

 outside of the inner box at the 



Fig. 22.-Cross section of strainer for Bordeaux top, SO aS to preVCUt itS dropping 

 mixture. The inner frame with inclined wire ^OO far doWU; tllis will facilitate 

 strainer fits loosely into the outer box. . , ' 



its removal. 

 Elevated Platform. 



A platform similar to the one shown in the accompanjdng illus- 

 tration (fig. 21) w^ill be found very convenient in handling the stock 

 solutions and the mixture. This should be located near a good 

 water supply. A tank elevated above the mixing platform and filled 

 by a windmill pump will be found very convenient, or the platform 

 may be located beside a stream or spring and the water be raised 

 by means of a force pump. 



NONSTAINING PREPARATIONS. 



Bordeaux mixture, when used late in the season, is apt to stain 

 the fruit more or less and interfere with its sale. It is therefore best 

 to use for the final applications some other fungicide which is not 

 open to this objection. The amount of the mixture which may 

 adhere to the grapes at the time they are picked is not sufficient to 

 injure the consumer under normal or average conditions. Consum- 

 ers, however, object to stained fruit, and this fact must be taken 

 into account. 



The following preparation, though not quite so efficient a fungi- 

 cide as Bordeaux mixture, does not stain the fruit, and should, there- 

 fore, be used for the last two applications. 



Burgundy mixture {copper carbonate mixture). 



Copper sulphate pounds. . 2 



Sodium carbonate (sal soda) do 3 



Water gallons. . 100 



284 



