166 SOME GENERAL CONSIDERATIONS 



is the nurseryman's authority for making the shipments. 

 Every package that is sent out must contain one of these 

 certificates of inspection. These are not necessarily valid 

 for interstate shipments. Every state reserves the right 

 to reinspect all nursery stock shipped in from outside. 

 Certificates that are good in one state may or may not be 

 acceptable in others. The only sure *way is for the shipper 

 to secure copies of the law in states in which he intends 

 to do business and inform himself on the requirements 

 before attempting to make any deliveries. 



The insect pests or diseases that will prevent the ship- 

 ping or selling of stock vary somewhat in the different states 

 but the chief ones are the following: 



INSECTS DISEASES 



Brown tail moth. Black knot of cherry and plum. 



Gypsy moth. Crown gall. 



Mexican cotton-boll weevil. Hairy root. 



San Jose scale. Rosette of peach and plum. 



West Indian peach scale. Yellows of peach. 



Woolly aphis. White pine blister rust. 



In the northern states some of these are of no particular 

 consequence while further south some that are not on the 

 above list are included. In Florida the Mango Weevel 

 and the Fruit Fly are among the troublesome ones. 



Federal Horticultural Board. The regulatory measures 

 passed by the various states are not all of the laws with which 

 the dealers or growers of nursery stock have to contend. 

 There have been certain questions pertaining to the impor- 

 tation of plants from other countries and the quarantining 

 of certain areas to prevent the spread of diseases, which could 



