L\ SECTS AFFECTING VEGETATION 



The following tables give the itemized cost of spraying with a 

 barrel pump: 



Material. 

 Bordeaux Mixture. 



3 pounds of copper sulfate at 8c $0.24 



4 pounds lime at Ic 04 



$0.28 



Arsenate of lead, 2 pounds at 20c, or Paris 



green, ^ pound at 25c .40 



Total cost of spray material per barrel .... $0.68 



One barrel (50 gallons) covers 20 20-year- 

 old apple trees, or cost of material per 

 tree .034 



Labor. 



Two men at $1.50 per day $3.00 



One horse at $1.50 per day 1.50 



$4.50 



Will cover 150 trees per day, or labor per 



tree 0.03 



Total cost per tree for one spraying $0.064 



Cost of first spraying with copper sulfate only .038 



Total cost of four sprayings per tree .23 



Profit from Spraying an Orchard of 100 Trees. 

 Average gross profit per tree, based on above ex- 

 periments, at $1.25 $125.00 



Four sprayings at 23c., or say 25c. per tree $25.00 

 20% on $40 invested in the best outfit. . 8.00 



33.00 



Net profit $92.00 



Less cost of outfit . 40.00 



Net profit for first year (80% on total investment) $52.00 

 Can You Afford Not to Spray? Can You Make Money More 

 Easily? (Bui. 131, New Hamp. Agr. Exp. Sta.) 



BENEFICIAL INSECTS. 



PARASITES. 



Insects are beneficial to man in numerous ways, as furnishing 

 food and clothing (as honey and silk), materials used in the arts 

 and sciences, as cochineal dye, shellac, Chinese white, and in some 

 countries they are an article of food. By far the greatest benefit 

 comes, however, from their warfare among themselves, whereby 

 noxious species are kept reduced. For present purposes insects may 

 be considered as parasitic and predaceous. 



Parasitic Insects. These are mostly small to minute wasps, but 

 also some two-winged flies, which deposit their eggs in or on the 

 eggs, Iarva3, or pupaB of their hosts, on which the resulting larvae 



