12 MISSOURI AGRICULTURAL EXPERIMENT STATION CIRCULAR 101 



At the present time a form of sodium cyanide which is stronger than 

 potassium cyanide is being substituted for the latter. Due "to the fact that 

 the sodium cyanide is stronger than the potassium cyanide a slight change 

 has to be made in the formula, otherwise the method of using it is exactly 

 the same. The formula recommended when using sodium cyanide is one 

 ounce of sodium cyanide, 1^ ounces sulphuric acid and two ounces of 

 water. Sodium cyanide is much cheaper than potassium cyanide and gives 

 just as good results and is therefore coming into general use. 



As previously stated, the use of a miscible oil for treating nursery 

 stock which has been subject to infestation by San Jose scale is practiced 

 to some extent by some nurserymen and good results have been obtained. 

 In case a miscible oil is used, a tank or vat is constructed large enough to 

 allow the dipping or complete emersion of the top of the trees to be 

 treated. The oil is used at a strength of one gallon of the oil to twelve or 

 fifteen gallons of water and the stock to be treated is completely emersed 

 except the roots, immediately removed and allowed to drain and dry. 



In 1915 a number of experiments were started at the Missouri Agri- 

 cultural Experiment Station to determine the most practical, efficient and 

 cheapest method to use in controlling scale on nursery stock with the 

 least possible injury to the plants. The results of this work will appear 

 in a separate publication. 



Unfortunately only $2000 of the $10,000 appropriation made by the 

 State Legislature was made available for use in 1919-20 and this was not 

 made available until very late in the year. However, this sum made it 

 possible for the inspection service to carry on its work to a much greater 

 extent than would otherwise have been possible. 



Due to the increase in price of railroad fares, hotel accommodations, 

 labor etc., it costs the Inspection Service just about twice as much to do the 

 same amount of work as it did four years ago. Thus it would have been 

 practically impossible for the inspection service to have carried on its work 

 without this additional help. 



PLANT INSPECTION 1920 



During the year 1920 the inspection work was done by Dr. Leonard 

 Haseman, chief inspector and K. C. Sullivan, S. R. McLane and G. A. 

 Tumbleson, deputies. Due to the fact that $5000 of the $10,000 state appro- 

 priation was made available the work of the Plant Inspection Service was 

 enlarged. A very important phase of the work which is being carried on 

 in addition to the nursery and orchard inspection is the inspection for the 

 European Corn-borer, which will be discussed later. 



The following 100 nurseries were inspected during the summer of 1920: 



NURSERIES INSPECTED 1920-21 



Aroma Plant Company. Seligman Chapman, W. C., Higbee 



Bennet. B. F,, Seymour Clever Nursery Company, Clever 



Bellefontaine Cemetery, St. Louis Crotsenburg, C. N., Carthage 



Birch, F. A., Neosho Davis, E., Seligman 



Crumly Brothers, Monett De Soto Nursery Co., De Soto 



Calvary Cemetery, St. Louis Dobbs, Earl S., Anderson 



Cameron Nursery, Cameron Elk Horn Nurseries, Noel 



Case Nursery, Case Ely, H. S. & Company, Neosho 



