COMBINING SPRAYING MIXTURES 



29 



the curculio, if it is to be destroyed by the fung-otis 

 disease known as fruit rot; to save raspberries from 

 the slug if they are to be ruined by anthracnose; to 

 save tiie grape buds from the flea beetle if the berries 

 are to be destroyed by black rot; or to save a pear 

 crop from the ravages of the codling moth and curculio 

 if it is to be distorted and disfigured by the scab ; or, 

 to take an example which will strike home to a large 

 proportion of American farmers, it is scarcely worth 

 while to save the potatoes from the Colorado beetle if 

 they are to be ruined by more serious enemies — the 

 potato blights. While the necessity for preventing, so 

 far as possible, injuries of both these classes of organ- 

 isms is obvious, it is almost equally evident that there 

 will be a great loss of time and labor if each is treated 

 separately. For instance, the farmer who sprays his 

 potatoes with the arsenites two or three times for the 

 beetles, and then goes over them again vv^ith solutions 

 of copper sulphate for the blight, would have accom- 

 plished the same end in half the time by mixing the 

 copper sulphate and London purple or Paris green in 

 one solution and applying them together. The same 

 is true of the treatment of apples, pears, plums, and, 

 in fact, of a large proportion of the crops liable to 

 injury by both insects and fungi.'' 



Since the above was written a great many exper- 

 iments along the lines indicated have been made, and 

 we now have a number of satisfactory combinations. 

 Chief among these are the following: 



Bordeaux Mixture and Arsenites — Add 4 ounces 

 Paris green to 50 gallons of Bordeaux mixture. 

 This is one of the very best combined insecticides and 

 fungicides. It may be used safely and efifectively upon 

 a great variety of crops — such as potatoes for Colorado 

 beetles and blight, apples and pears for insects and 

 scab, and plums for curculio and leaf or fruit diseases. 



