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7/18/30 



The losses from these psrfesi tid , nedtetn ristletoes are very heavy. As 

 far as is Iqiovto, it does not occur in tllo eastern part of the country. Experi- 

 ments have shown, Dr. Hartley says, that the pine mistletoe niglit well be able 

 to cause dexnage to Eastern pines. 



That is wliy, he points out, it is very unv/ise to ship pines fron the 

 17est to the East. The practically treeless bolt through the Great plains regions 

 has apparently served as a nature! barrier to the eastward spread of the western 

 pine mistletoe. Shipping across may defeat nature's quarantine. 



Some of our rrorst tree diseases have been those brought in from other 

 sections and other countries. The higlily destructive chestnut blight and the 

 white pine blister rust are fungus diseases which have been brought in fron abroad. 

 Diseases of this typo are caused by fungi that kill the bark and girdle the treei 

 "Aost of them are so small that even their fruiting bodies can only be scon with 

 the aid of a microscope. 



The chestnut blight was introduced from Asia years ago, before the plant 

 Quarantine law was passed. But even with the most careful inspection and regula- 

 tion, Dr. Hartley fears that vrith increased ariount of transportation of living 

 plants and woods, we are going to get in additional forest diseases from abroad. 

 The one hope he sees is in the cooperation of us all in preventing the shipment 

 of nursery stock from abroad to prevent new diseases getting in, which may prove 

 tremendously destructive to ovs forest resources. 



You see toadstools and many, majiy of their tiny cousins, too snail to be 

 noticed, strike at the very heart and roots of our timber supply. The ftingi nay 

 be small, and the injury apparently slight at any one time, but in the long life 

 of a tree the total damage is often very heavy indeed. 



— ooOoo — 



AIT^TOUITCSI.rSTT; Station cooperates with the United States Department of 



Agriculture in presenting the talks such as you have just listened to. This 

 series called "71th Uncle Sam's Naturalists" is part of our program every other 

 Friday. 



.7 // / / 

 TTTifT 



