202 



Bulletin 307 



General results of spraying 



Effect. 



Excellent .... 



Good 



Fair 



Injury 



Machinery 



Hand pumps. 

 Power pumps 



No. of 

 orchards 



4 

 96 



6 

 18 



134 

 34 



TABLE 32. Bordeaux Formulae in Use 



3-3-50 

 3-4-50 

 3-5-50 

 4-4-50 

 4-6-50 



5-5-50 

 6-6-50 



No. of 

 orchards 



44 



5 



6 



18 



20 



13 



8 



Relation of spraying to yield and income 



Table 33 shows that it pays to spray. Orchards not sprayed at all 

 produce a very low yield, 40.2 barrels per acre on the average for four 

 years, with an income of $67.66. The group of orchards sprayed once 

 yield a little more, having a four-year average yield of 50.6 barrels per 

 acre, and an income of $83.40. For orchards sprayed twice, the four- 

 year average yield is about 63 barrels per acre and the income about 

 $116. The group of orchards sprayed three times, although yielding 

 little more on the average for four years than those sprayed twice, surpass 

 all others in incom.e, which is $140.26. The number of orchards sprayed 

 four times is hardly large enough to warrant any definite conclusions, 

 but it is interesting to note that they produce the heaviest yield, on the 

 average, although the income is lower than that of orchards sprayed 

 three times. 



The significant fact in Table 33 is that both the unsprayed orchards 

 and those sprayed once are far below the general average in both yield 

 and income; those sprayed two times or more are well above the general 

 average. It is better to spray once than not at all, but to get results 



