LOUISIANA CIRCULAR No. 4. 21 



Oeorgia, and in dozens of instances infestation of nurseries has 

 been prevented by the inspector finding San Jose scale in the or- 

 chards from which the nurserymen intended to obtain buds or 

 -grafts, and advising the nurserymen regarding the danger of ob- 

 taining buds from these sources. The fumigation of all budding 

 and grafting wood (in the case of deciduous trees only) with 

 hydrocyanic acid gas before use is likewise a good precaution for 

 "very nurseryman to take. 



Dissemination of the San Jose Scale over long distances, and 

 from one portion of the country to another, is almost entirely by 

 t he shipment of infested nursery stock. Nurserymen cannot con- 

 veniently grow all of the fruits and plants which their customers 

 are likely to call for, and it is often also impossible for the nurs- 

 eryman to foresee the extent of a season's demand for fruits of 

 certain varieties. Hence it comes about that almost every nurs- 

 eryman has occasion to purchase stock from other nurseries, and 

 in order to secure varieties demanded by his trade it is often 

 necessary for him to make these purchases from nursery firms 

 many hundreds of miles distant. Naturally he is often ignorant 

 of the conditions surrounding these latter nurseries and of the 

 extent to which their stock has been exposed to possible infesta- 

 tion. Hence the scale is not infrequently shipped from one nurs- 

 ery to another, with the result that the nurseryman receiving the 

 infested stock gets the majority of his own trees infested in turn 

 and distributes them often without a knowledge of their true 

 condition and without malicious intent to his customers. As 

 stated upon a previous page, the progress of the San Jose scale 

 from California to New Jersey and thence to nearly every State 

 east, of the Rocky Mountains has been clearly proven to have been 

 by shipments of nursery stock. 



The only logical and practical way to prevent the spread and 

 -dissemination of San Jose scale through shipments of nursery 

 stock is by the enforcement of a practical quarantine law where- 

 by every nurseryman is required to have his stock inspected an- 

 nually by a competent inspector, under State supervision. Such a 

 quarantine law should successfully prevent the sale or shipment 

 of stock from infested nurseries under any and all circumstances. 

 The State Crop Pest Commission has enacted quarantine reirula- 



