SPRAY MANAGEMENT 



THOUSANDS OF BUSHELS 



INDIVIDUAL FARMS 



Figure 2. — Distribution of orchards according to 

 expected normal crop 



normal respectively for four years. Another orchard yielded 87, 371, 

 69, and 133 per cent of normal. Several orchards were constantly low in 

 yield; for example, one operator reported yields that were 35, 60, 41, and 

 48 per cent of normal. On the other hand, one small orchard had yields 

 of 170, 165, 360, and 199 per cent. The lowest yield reported for any 

 one year was 19 per cent of normal and the highest 371 per cent. 



No doubt this variation in yield is an important factor in account- 

 ing for variations in spray practices on the same farm in different years 

 and between individual farms in the same year. Naturally, the operator 

 with a prospective large crop can afford to spend more material and 

 labor per tree. The cost per bushel of an additional spray would be in- 



INDIVIDUAL FARMS 



Figure 3. — Distribution of 27 individual orchards according to per- 

 centage of average actual yields to normal expected yield 



