134 THE AFTER TREATMENT OF NURSERY STOCK 



disease and not amenable to spray treatments. Moreover 

 the disease may remain in the soil from year to year and 

 reinfect the succeeding plantings. 



In former years where these troubles were less marked, 

 there were no restrictions on the shipping of the stock, 

 and as a result, many troubles were spread far and wide 

 over the country. Now, most states have regulatory 

 measures and nursery companies must submit their stock 

 to a rigid inspection by some state official before it can be 

 shipped. The Government also has official inspectors 

 to regulate interstate shipments, and quarantine offices 

 to look after stock that may be imported. While this 

 work is recognized as being efficient in preventing the 

 shipping of diseased stock, still, there is always a possible 

 danger. 



Spray Machines. Nursery work requires a special kind 

 of spray outfit. Such an equipment must work rapidly, 

 must cover several rows at once and be able to do the work 

 while moving across the field. In many cases it is neces- 

 sary to get the spray down along the trunk when the tops 

 are very close and thick. Any machine that would be large 

 enough to pass over the tops of the trees without damag- 

 ing them, could not help but be awkward and unwieldy. 

 Many types of such sprayers have been devised but the one 

 shown in Fig. 62 has been worked successfully for a num- 

 ber of years. It was manufactured by the Greening 

 Nursery Company of Munroe, Michigan, and will success 

 fully spray the trees from ground to tips. 



Counting the Trees. It is always desirable that nur- 

 serymen have an estimate of the number of salable trees 



