10 

 sprayer or one of the knapsack type as with a barrel pump or power outfit. 

 With a power outfit, regulate the pressure at from 100 to 150 pounds per square 

 inch. 



Fig. 2.— Automatic Shutofif Used in Experiments. 



What may be called the average cost of spraying squashes has been figured 

 from the records kept of the experimental work. The cost per a^'re can be 

 seen to vary enormously, depending on the type of planting (hills per acre 

 and plants per hill) and the stage of growth of the plants during the period 

 of spraying. The figures given below are for four treatments, one week apart 

 in July, applied to an acre containing one thousand squash plants of average 

 growth. 



1. Using compressed air or other small capacity, low-pressure outfit. Black- 



leaf " 40 ", 1-100 recommended. 

 Dilute spray material, 150 gallons containing Black-leaf 



"40", 1.5 gallons at $12.50 $18 75 



1 man, 24 hours at $.40 9 60 



Total cost per acre of one thousand plants . . . $26 55 



2. Using a barrel pump or power outfit giving a fairly large delivery at 100 to 



150 pounds pressure. Black-leaf "40", 1-250 recommended. 

 Dilute spray material, 275 gallons containing Black-leaf 



"40", 1.38 gallons at $12.50 $17 25 



3 men — 1 horse, 6 hours at $1.55 9 30 



Total cost per acre of one thousand plants . . . $26 55 



If the type of planting calls for more than 1,000 plants per acre, the cost 

 of treatment is increased accordingly. 



In an effort to discover the average increase in yield which might reasona])ly 

 be expected from the use of the above treatment, and the relation of the value 

 of this increase to the cost of treatment, letters were sent to prominent 

 squash growers in various parts of the State. The replies received from those 

 portions of the State where the borer is well established have been tabulated as 

 follows : 



Table VIII. . — Average Expected Increase in Yield of Winter Squashes. 



I 



Average 



59 5 



