22 



HOW TO CONTROL THE PEAR THRIPS. 



spray should be directed first against the underside of the leaves, 

 beginning with the lowest branches and spraying upward. Most of 

 the larvae are feeding on the under surface of the leaves, and spraying 

 the upper surface first would serve to knock the larvae from the trees 

 without their coming into contact with the spray. Angle nozzles of 

 the type shown in figure 15, giving coarse, penetrating spray, should 

 be used for all applications. 



MATERIALS TO USE. 



The combination of 3 per cent homemade distillate-oil emulsion, 

 made from raw distillate, 32° to 34° Baume, and the nicotine solutions, 



a h 



Fig. 13. — a, French prune buds; b, Imperial prune buds; showing stage of parliest 

 buds at time of first application against thrips. (Original.) 



is given preference over all other sprays used so far. To dilute, 

 measure out 5^ gallons of the stock emulsion for each 100-gallon 

 spray tank, or 11 gallons for a 200-ganon tank; start the engine; pour 

 the stock emulsion into the spray tank, and while the agitator is 

 running, add the water to fill up the tank, putting in the strong 

 nicotine solution last and after the stock emulsion has been diluted. 

 For spraying in the interior counties add to this dilute oil-emulsion 



