22 CROP PEST COMMISSION OF 



tions (having the force of law) which it is believed will meet 

 these requirements. Particular mention of these regulations 

 is made upon a subsequent page. 



In addition to the inspection of nursery stock, the proper 

 fumigation of this stock affords an additional safeguard against 

 the scale. Individual San Jose scales are very minute objects 

 for which to search among hundreds or thousands of growing 

 trees, and while a competent inspector, after a careful examina- 

 tion, may be able to say that in all probability this pest is not 

 present in a given lot of nursery stock, still from the very nature 

 of the case he cannot guarantee that the stock is absolutely free 

 from this insect. Likewise, while a thorough fumigation with 

 hydrocyanic ^acid gas will in the great majority of cas?s kill all 

 scales upon infested trees, the fumigation process, for a number 

 of reasons, is by no means infallible. Hence it is clearly seen 

 that trees which have not only been inspected, but which have 

 also been properly fumigated, are the safest trees for the or- 

 chardist and farmer to buy. Infested trees should never be 

 sold under any circumstances, regardless of how many times or 

 how carefully they have been fumigated, and the fruit-grower 

 who is watchful of his own interests will firmly refuse to purchase 

 stock of nurserymen who are not provided with an inspection 

 certificate, and will by preference make his purchases from nurs- 

 erymen who also make a practice of carefully fumigating all 

 trees which they ship or sell. 



Nurserymen can profitably guard against infestation of their 

 nurseries by not only purchasing fumigated stock, but they can. 

 wisely fumigate all stock which they receive, regardless of 

 whether it has been previously fumigated by other parties or not. 



Control of the San Jose Scale by Spraying. 



Having in the previous paragraphs, touched upon the means 

 by which the San Jose scale is distributed and the means by 

 which both nurserymen and orchardists can be protected from 

 infestation of their premises by the proper enforcement of quaran- 

 tino and inspection regulations, and how orchardists can further 

 guard against this pest by purchasing only trees which have been 

 fumigated, we come now to consider the case of the man who is so 



