14 



INSECTS IXJUKIOUS TO SUBTROPICAL FRUITS. 



(1) Liiue-sulpliiir (3;3^ Baume) 1 to 75 and blackleaf tobacco ex- 

 tract (2f per cent nicotine) 1 to 100; or, using blackleaf ''40" {40 

 per cent nicotine) tobacco extract 1 to 1,800. 



(•2) If lime-sulpliur of 3G° Baume is used the formula would be, 

 lime-sulphur 1 to 8G and blackleaf tobacco extract 1 to 100 ; or black- 

 leaf tobacco extract "40" (40 per cent nicotine) 1 to 1,800. 



To load a sprayer having a 200-gallon tank, proceed as follows: 

 First turn water into the tank until nearly full, add 2| gallons lime- 

 sulphur (33° Baume) and 2 gallons blackleaf tobacco extract (2| 

 per cent nicotine) ; or 14 fluid ounces blackleaf " 40 '' tobacco extract 

 (40 per cent nicotine). If the lime-sulphur is 36° Baume, use 2.1 



Fig. 2. — i'ower sprayins' outlit in usf in si)rayiug for tlie uiauj;u iluips. (Original.) 



gallons, and 2 gallons of blackleaf tobacco extract ; or 14 fluid ounces 

 of blackleaf " 40 " tobacco extract. 



HOW TO SPRAY. 



In spraying for the orange thrips only those insects actually hit with 

 the spray will be killed. As this insect obtains its food by sucking the 

 plant juices, stomach poisons are of no avail. In order to spray with 

 greatest efficiency it is necessary to use a gasoline power sprayer, 

 maintaining a pressure of 180 to 200 pounds. (See fig. 2, showing 

 a power outfit in operation.) Angles or elbows should be used on all 

 spray rods so that " over.4iot " and " undershot '' spraying can be 

 done; that is, spraying from above downward, and from below up- 



