COMBATING APPLE SCAB. 39 



sucking insects are bad, it will be necessary to spray the trees with three- 

 eighths pint of 40 per cent nicotine sulfate in 50 gallons of water, or dust 

 the trees with a commercial nicotine dust. 



Miscellaneous. 



Dry lime-sulfur passes through the spraying outfit better if it be allowed 

 to stand in water about forty minutes before it is poured into the spray 

 tank. Before going to the orchard with each tank of spray material, 

 it is a good plan to weigh out the desired amount for the next tank in a 

 5 or 6 gallon pail, pour water over it and agitate with a wooden paddle 

 for a few minutes. On returning, the spray tank is filled about two-thirds 

 full of water, the agitator set in motion, the lime-sulfur from the pail 

 poured into the tank, and the tank filled with water. Some growers con- 

 sider soaking of the material unnecessary before putting it into the tank. 



Lime-sulfur should be well agitated before it is applied to the trees as 

 a too concentrated solution will burn the fohage. 



Twelve-year-old trees with a height and spread of approximately 20 

 feet should receive about 4 gallons of spray material with each application. 



Follow the spraying system outlined for 1921. ^ It is better to spray 

 against the -wind than with it, as less spray materials are wasted and a 

 better covering is obtained. 



The engine and duster of the dusting outfit should be on a low wagon 

 or truck built especially for the purpose, so that the operator may shoot 

 the dust upward through the tree. Special effort should be made to hit 

 the extreme tops of the trees. Best results are obtained by giving the 

 hose of the duster a quick circular or an up-and-down movement so as to 

 hit all parts of the tree. Dusting should be done only when the surfaces 

 of the leaves are moist. At least two sides of the trees should be dusted. 

 On trees twelve to fifteen years old, approximately 1§ pounds of dust 

 should be used on each tree at each application. 



• Extension Circular, "Apple Scab and its Control." This maybe obtained by applying to- 

 Extension Service, Massachusetts Agricultural College. 



