CALIFORNIA CITRUS CULTURE. 67 



Commercial Lime-Sulphur. 



The commercial spray is a perfectly clear liquid, easy to handle and 

 needing only to be properly diluted for use. It is usually sold in barrel 

 lots. There are two common brands upon the market in California, 

 sold under the trade names, "Rex" and "Ortho," though there are 

 other sprays equally as good manufactured elsewhere. 



For red spider on citrus trees this spray is applied as a two or three 

 per cent solution. 



Carbolic Acid Emulsion. 



Whale oil soap , 40 pounds 



Crude carbolic acid 5 gallons 



Water to mix 40 gallons 



Dissolve the soap in hot water (the soap must be entirely dissolved) ; 

 add the carbolic acid and heat to the boiling point for twenty minutes 

 (reserve some water to add in case the mixture begins to boil over). 

 For use add twenty gallons of water to every gallon of the above stock 

 solution. The emulsion needs little or no agitation. 



This spray is especially recommended for mealy bugs, but is also 

 suitable for plant lice and soft brown scale. It is also a good contact 

 insecticide for ants. 



Resin Wash. 



Though not a true emulsion and fast losing prominence as a spray, 

 this wash is included here because of its value as a spray and dip for 

 plants with tender foliage. 



Resin 10 pounds 



Caustic soda (76 per cent) 3 pounds 



Fish oil 1 pounds 



Water 50 gallons 



Put oil, resin and a gallon of water in an iron kettle and heat until 

 the resin is softened ; add the lye (dissolved in a small amount of water) 

 and stir thoroughly, after which add enough water to make fifty gallons 

 of spraying material. 



This wash is only effective for young scale insects, plant lice, or other 

 soft-bodied insects. 



Lead Arsenate. 



No. 1. Commercially prepared. 



Lead arsenate (paste) 6 to 8 pounds 



W T ater 100 gallons 



No. 2. 



Arsenate of lead (powder) 2 to 8 pounds 



Water 100 gallons 



Preparation Simply dissolve the paste or powder in the required 

 amount of water or in a small amount and add the remainder for use.. 

 A poison spray for leaf-eating insects. 



