DISINFECTING NURSERY TREES 



485 



21. Resin Dipping Solution: 



Resin, 20 pounds; caustic soda or lye, 8 pounds; fish oil, 3 pints; 



water, 100 gallons. 



Boil resin and caustic soda in 50 galkns of water for 1 hour. Dilute 

 to 100 gallons. 



In use for dipping citrus nursery stock for scale insects and Red Spiders. 

 Kerosene emulsion and lime sulphur solution also used for dipping de- 

 ciduous nursery stock. 



Hydrocyanic Acid Gas. For details of fumigation processes for 

 scale insects on citrus trees, apply for publications to the University 

 Experiment Station and to Horticultural Commissioners in citrus 

 fruit growing counties. The materials are so poisonous, the appli- 

 ances so elaborate and the operation, to secure efficient insect kill- 

 ing without injury to the tree, is so exact and systematic that careful 

 and experienced fumigators are essential. 



