THE MONTHLY BULLETIN. 



307 



It is also quite effective against certain root maggots, like those 

 iffecting cabbage and cauliflower. For these it is used in the form of 

 a decoction, one ounce in one gallon of water and about half a pint 

 poured around an infested plant, from which the earth has been drawn 

 away to facilitate soaking directly around the plants. To be effective, 

 the material must be brought into direct contact with the insects. 

 Hence, it should be liberally used and applied before the maggots get 

 down too far, or into the plant too deeply. In the garden its use is 

 quite practical; in the field it has not been found so satisfactory. 



REPELLENTS. 



It is apparent that certain materials, applied to the foliage of plants, 

 are somewhat repulsive to some insects. One of the most important 

 of these repellents is the well known fungicide, Bordeaux mixture. 

 Because of this and its use as a combined insecticide and fungicide the 

 formula and directions for making are here presented quite fully. 



BORDEAUX MIXTURE. 



rnslakcd lime 4 pounds 



Copppr siili)lial(" (bhicstone) 4 pounds 



Water 50 gallons 



The task of mixing these chemicals, where large quantities of the 



spray is used, is no small thing in itself. "A great deal of study has 



been given to the construction of suitable mixing apparatus. 





Fig. 297. — Apparatus for preparing Bordeaux mixture. Tlie lime is first slalted 

 in tiie siiallow vat above and mixed witlr tiie required amount of water in the lower 

 tank from which it is drawn off into the spray tank containing the diluted bluestone. 

 A cross-section of the mixing tank is shown in Figure 298. (Original.) 



